Double Star Measures Made with the 40-Inch Refractor of the Yerkes Observatory

$Double Star Measures Made with the 40-Inch Refractor of the Yerkes Observatory$

ASTRO N OM ISC HE NAC HRICHTEN. Nr. 4301-02. Band 180. 5-6.

Double star measures made with the 40-inch Refractor of the Yerkes Observatory. By S. W; Burdam.

The introductory remarks to my double star measures viously these members of vast systems of some kind have printed in A. N. 4209 and 4261 apply to the observations nothing whatever to do with the general question of the given here, and need not be repeated. The purpose through- proper motion of small stars. On the whole it is very re- out has been to supply the observations wanted to show the markable that so few instances of motion have been dis- present relation of stars not previously or recently measured; covered, considering the time and the number of observers to confirm or negative apparent changes from proper motion engaged in the work. Doubtless, photography will hereafter or otherwise; and to record measures, which either now or detect perhaps many other small stars in motion. in a future more or less remote, should have a special value. In this interest many of the measures relate to the question The best if not the only way to improve our know- of proper motion in one or more of the observed stars, ledge of the proper motion of the large stars is by syste- and tend to confirm or correct the movement deduced from matic micrometric comparisons with stars from the tenth to meridian observations. the fifteenth magnitude. Conclusions derived from ,measures That these values from transit positions in very many of a comparison star a magnitude or two brighter will rarely of the stars are somewhat uncertain in amount and direction, require any modification. It is a significant fact, and one and especially where the movement is small, is obvious from having an important bearing on this question of the general the very different results obtained by the various computers. absence of any sensible proper motion in the small stars, Small stars, or those below the tenth magnltude, having any that when two or more comparison stars are used, they give certain proper motion are excessively rare. After the use practically the same value for the movement of the bright of the micrometer by experts for at least three quarters of star, and the correction to that motion as derived from a century, only a few examples have been found of small meridian observations is usually not larger, and sometimes stars having any sensible independent proper motion. The much less, than the differences in the values by different General Catalogue of Double Stars, which includes nearly computers. It may be noted further that when any of these all the relative positions of small and other stars obtained small stars have been measured with reference to other small with the micrometer from the earliest reliable results to the stars near by, the absence of any relative change has been present time, furnishes two or three examples of stars of the invariable result. this class which are actually moving in space, and perhaps The measures given here do not by any means in- a few others where a suspected small motion may be con- clude all that has been done in this interval, but only those firmed by other measures hereafter. I have previously called stars which are fully measured, and therefore disposed of attention to the most remarkable example I hare been able for the time being. The other stars remain on the working- to find of a small star with a decided proper motion in list until they are observed in like manner. With few ex- Monthly Notices for May, 1908. To argue that small stars ceptions it is a matter of no consequence that the measures have some motion in certain instances because the relative of a pair are spread over two or more years, provided the change does not correspond to the proper motion that has separate results are brought together at one time. All stars been assigned to the large stars, would be begging the whole of every class should be measured on at least three nights question, and the conclusion therefrom is not worthy of to give the best result the observer is capable of producing serious consideration. to say nothing of the freedom from accidental errors; and it Of course this has no reference to a large class of goes without saying that if a star is worth observing at all, stars, extending in magnitude to the limit of visibility in it should and will receive this amount of attention from the the largest telescopes, which are moving in space with much thorough and experienced observer. To confine the measures brighter stars, and at nearly or exactly the same rate and of double stars to the known binaries, however valuable and direction. The General Catalogue contains several hundred interesting that work may be, would be taking a very narrow examples of stellar systems of this order, where the small and limited view of the fields not fully investigated, and the star may be as faint as the sixteenth magnitude; but ob- things imperfectly known.

5 67 4301 68

/3 QC. 7. /3 1014. The proper motion of the large star 384. 2 53 rej. according to Auwers is: A and B. ofoio in 20605. 1907.845 34004 281'80 1908.63 I 335.0 I 1.52 8.000 341.0 28.89 8.044 340.8 28.38 These measures show that there has 262. 02 13. 1 I been no change since 189r. A and C. '907.96 I 340.7 I 28-69 The five positions by Eng., A and @ 32. 0. Stone I. 1908.843 16407 29r09 :1891-1907)give for the proper motion There is an error in the Cincinnati 345 162.9 29.30 If the primary: place of this star. It is identical with .862 164.2 29.30 I 1 01252 in 21207. B 3065 rej. (No.14). All the measures 1908.85 I 163.9 1 29.23 cited belong to 23065 rej. This movement from meridian obser- A and D. tations is somewhat uncertain in amount. The companion star, however, is large 113. Hd 10. (10417 , 1x413). :nough to have possibly a small motion ,f its own; and I have connected with ,t a third 12415 star. A set of measures 1908.85 I 179.6 I 41.38 I few years hence will show at once 1908.67 I 238.4 I 31.23 whether or not B is fixed. The note in GC. as to this pair fol- 304. 238. B and C. lowing a 7415 star, belongs to Hd 13 (No. 124) as given in Part I. The di- 1908.788 14500 16187 145.5 17.00 stance of Hd 10 in the measure of 1903 A04 is much too large. ,826 I 144.5 I 16.93 8.597 1908.81 I 145.0 I 16.93 1908.15 I 25.10 I 128.26 119. Hd XI. (9418, 10417). Certainly unchanged. 397. A.G. 7. (9417 , 1x410). 1908.750 31804 21752 345. 02(App.) 5. .I88 1 317.5 I 21.32 1908.64 I 291.0 I 36.45 1908:;;; I 143075 I 116168 .824 319.0 20.91 143.2 I I 16.05 1908.79 I 318.3 I 21.25 It was obvious that one or the other ,728 143.33 116.27 of the prior single measures of this star Early measures disagree in distance. must be wrong. 1908.72 I 143.43 I 116.33 The change, if any, is small. 400. H 6. This is identical with the last pre- ceding pair, A.G. 7. 361. a Cassiopejae. A and C. 408. H 7. (10410, 11413). 1908.750 30804 21:12 38130 .788 I 308.4 I 21.06 38-13 .824 308.0 20.97 38.39 1908.79 I 308.3 I 21.05 1908.613 33201 29105 38.27 This is BD +11O90. Error of 180° -633 I 333.3 29-13 in H. No other measures. .636 332.0 29.08 .652 1 331.9 29.00 1908.655 280026 64116 437. OZ(App.) 9. .673 280.22 64.06 A and B. .689 280.09 64.23 .692 280.02 64.06 1908.652 237007 97186 -655 I 237.30 97-45 64-13 1 -673 237.45 91-51 From the measures of 02 and /3 on 1908.66 I 231.27 I 97.61 29 nights, the real proper motion of A and C. the large star is: 1908.652 1 323008 1107139 07054 in 11604. .655 323.37 107.33 It is specially important that the mea- .673 I 323.50 I 107.33 sures of AC should be continued. 1908.66 I 323.32 1 107.35 69 430t 70

The only other measure of AC is: 64% H 2028. 672. 22 102. 1892.03 324052 105170 2n Eng. A and B. AB and C. Assuming C to be fixed, as it probably 1908.709 203080 61138 1908.709 22505 10115 is, the proper motion of A from the .7II 1 203.97 1 61.10 .71 I 10.20 two positions is: .728 203.75 61.05 .728 1 ::;:f 1 10.10 01167 in 9005. 1908.72 I 203.84 I 61.18 1908.72 I 224.5 I 10.15 To determine this hereafter, I have There has been no relative change, AB and D. measured a small star from C; and therefore the proper motion must be exactly the same. For a better de- I 908.709 62085 27:03 C and c (9m6 , II~I). termination of this hereafter, I have 17-03 62.48 27.16 1908.652 21808 19r50 measured a third star : 1908.72 I 62.80 I 27.07 .655 1 220.1 19.74 B and C. (12m2). .673 220.0 19.73 It is practically certain that the change 1908.66 I 219.6 I 19.66 in D is due to the proper motion of AB; but for greater certainty I have connected another faint star. 1908.72 I 210.25 I 46.83 D and E. 652. 0228. I 908.65 2 I 70068 I 26168 97196 170.93 126.86 97.52 ,655 98.02 .673 171.12 127.20 019 2 .689- 171.06 127.20 0.67 1908.72 I 355.37 91-83 0.85 E and e. (II~I, 13mo). 0.8 I 1908.728 -750 I 908.709 25085 130120 1908.74 1 53.8 I 10.23 .? 1 I 25.60 130.36 .728 25.82 130.1I 130.22 673. H 1077. (8m1, 1om9).

C and D. (II~o). 1908.709 156060 66y48 545. 2 83 rej. (8mo , I ~mo). .~II 155.83 66.55 1908.74 294.7 38.56 .728 155.75 66.60 I 1 1908.559 31206 21'197 1 1 No other measures. ' -573 3'3.6 2 1.89 1908.72 I 156.06 I 66.54 -597 312.9 2 1.90 In the measures by A, C is treated 21.92 as the primary. As printed in Part I it 794. 8132. is 180O in error. A and a. (14402). 668. H 1065. (9m4, 11F4). 658. H 2030. 1908.520 I 15805 I ~$34 A and B. (9m0, 12m5). -531 158.8 23.37 I 908.7 28 4800 24112 158.6 23.55 -573 .7 50 48.9 24.02 1908.54 158.6 I 23.42 .766 I 49.2 ! 13-98 A and C. This is BD+27"171, and not H 631 '908.75 I 48!7 I 24-04 1908.652 228090 68175 which could not be found. 228.95 A and C. (9m2). -655 68.7 7 -673 229.13 68.56 1908.728 19302 38166 1908.66 I 228.99 68.69 561. 72 Piscium. H 1068. .750 1 193.2 1 38.62 .766 193.6 38.69 1908.652 260086 55127 A and D. -655 260.17 54.72 1908.75 I '93.3 I 38.66 1908.652 I 13003 135161 .67 I 261.20 5 5.43 A and C are respectively BD +52"297 *655 113.17 '35.72 3573 261.62 5 5.29 and +53"266; and the RA. should be .673 "3.35 134.98 I 908.66 260.96 55-18 Ih 9"31". 1908.66 I 113.18. 135.44 5' 5' 7' 430' 72

D is BD +47O509. The only other An earlier position is: 5147 measure is: 1881.09 161000 1491129 3n B1 5-89 1881.46 95040 1331'96 3n B1 5.39 As the separate distances differ by 1148. 66 Ceti. 8231. 1908.66 288.0 1 5.58 more than I", it would be unsafe to A and B. infer any real change. 1908.709 23200 15182 .7 I I 231.1 16.01 851. 8163. .766 I 231.4 1 15.88 A and C. (9417). 1908.73 I 231.5 I 15-90 A and C. (11418). 1908.824

1908.54 I 254.47 j 114.79 - The only prior position is: 1908.84 I 61.13 I 172.69 1879.40 254025 114179 2n B1 The large common proper motion of 4-0.145 -0.171 the bright stars is well known. For future use I have connected the nearest out- Further measures of these stars will 1037. 2'192. decrease the error probable in the re- side star. sult given here. A and C. (9410). Hd 56 (No. 1142) should be in the field. There must be a large error in Measures 07224 in 13907 the Hd place. I could not find it any Auwers 0.248 in 157.8 where in the vicinity. A comparison of the present position 1908.54 I 145.96 1 75.99 of the faint star a with the rough set- 1188. 10 Trianguli. H I I I 5. ting of 1904 tends to show that it is C is BD +57"448. The only measure is: 1908.766 20409 57!'27 not moving in space with the other. .788 204.8 57.51 1881.46 145047 77:15 3~ B1 1 1 .a04 205.2 57.43 '908.79 205.0 57-40 843. 8139. 1083. 61 Ceti. I I A and B. The large star has no sensible proper A and B. motion. 1908.518 22305 9183 Auwers 0!'015 in 34402. .556 222.1 9-90 .559 1 223.1 1 10.02 1238. A.G. 38. 1908.54 I 222.9 I 9.92 1908.67 I '93.55 I 42.93 A and B. (8907 , 8?9). No change since Dembowski. Two A and C. 1908:;;; 1 260058 I 34124 faint stars closely p AB. 260.73 34.53 .766 260.90 34.48 A and C. (9m4). 1908.73 I 260.74 34.48 1908.5 18 I 1908.67 I 325.77 1 83-19 A and C. (11m5). -559 1908.709 1 180012 1 126116 1908.54 I 87.80 1 107.31 1103. A.G.31. (9m5, 12%). .766 180.63 126.10 The only other observation of this is: 1908.74 I 180.37 I 126.13 1887.46 87097 106!'89 3n €31 The larger components are supposed to have some proper motion. The difference is undoubtedly due to 1908.80 I 146.7 1 32.29 errors of observation. Disagrees with former position. 1262. c Cassiopeiae. B 262. C and D. 841. 8162. 1136. 2225. 1908.520 A and D. (9917). A and C. (IO?;). 56 I 908.5 18 * 1908.597 161025 1501'45 .5 .613 1 161.00 I 150.32 1908.54 I 56.93 I 206.05 ,573 .633 161.16 150.26 For comparison we have : 1908.55 I 95.79 1 '35.49 1908.61 I 161.14 I 150.34 1880.42 56070 205166 2n B1 73 74 1821. 2436. 1908.520 28302 20126 1908.671 23602 37717 .692 236.1 37.35 .613 282.7 19.94 1907,807 2909 2:45 -150 236.2 37-40 .636 283.4 19-90 7.867 27.8 2.70 1 I 1908.70 .652 282.5 19.73 8.559 25.1 2.49 I 236.2 I 37.31 '9.96 8.573 26.1 2.42 No third star near enough for the Distance increasing from proper motion. micrometer. 1839. fl 1041. 1294. Ku 10. (9m4 , 9m8). 3"o 1908.692 4 2003 12511.4 .in8 41.85 125.36 3.38 -750 4 1.80 124.79 .766 4 1.80 125.1 I 1908.65 I 356.5 I 3-37 125.10

1317. 2277. I I 169 A and C. (10910). 1908.32 I 72.5 I 4.28 11.97 1 908.5 3 I 11.94 I 1.87 -559 1434. Espin 5 I. 1908.55 I 22.26 I 161.77 A and B. (9m3). The four sets of measures of BC (1888-1908) give for the proper motion No evidence of change. 1907.807 I 30804 I 67:72 7.867 I 308.5 I 68.05 of 07232 in 13102. 1881.48 22043 161119 3n B1 8.559 I 308.3 I 67-75 The motion from meridian positions 1908.08 I 308.4 I 67.84 is too large. 1374. 229 B and C. (IOm4 , 10916). 1933. 43 Persei. S 440. A and B. 1907.807 25703 2134 A and C. (11m4). 1907.692 I 1806 3119 7.867 256.4 2.44 ~695 1 117.4 3.39 8.559 1 251.5 1 2-20 1908.843 I 133028 I 102Y24 ,769 118.9 3-14 1908.08 I 257.1 I 2.33 -845 133.57 102.90 .862 132.88 102.66 1907.12 I 118.3 3.24 No other measures. 1908.85 I 133.24 I 102.60 A and C. 1539. 2169. (9m3 9m4). No other measures of this. The prin- 1907.692 2 4 H , 102 65!'5 5 cipal stars have a common proper motion. -695 241.2 65.35 7193 -169 241.2 65.26 7-99 2073. y Persei. 02 73. 1907.1 2 I 241.2 65.39 A and C. B and C. I 90 7.692 24308 67"3 .69s I 243.9 67.35 1908.671 163007 81Y20 1907.69 I 243.85 67.44 .689 162.15 81.31 1908.72 I 231.77 I 84.27 South's angle of AC is 3105 sp. This .692 162.95 80.93 .709 162.89 80.94 The proper motion of the large star was erroneously reduced as sf; there- is small and uncertain: fore in Part I of G.C. for 12105 read Auwers 0!'028 in 19805 238". Newcomb 0.033 in 151.2.

1379. H I I 22. (9415 , 10912). 2103. OB(App.) 44. 1908.597 21605 10126 .633 216.0 10.31 .636 I 217.6 1 10.18 1908.62 I 216.7 I 10.25 1908.72 I 322.00 I 58.28 No other measures. No change. 75 430 I 76

2126.. 8523 2210. 8548. 2269. 8 570. A and B. A and C. 1908.709 25908 12184 1908.613 16203 10137 .750 259.6 12.85 .633 162.9 10.36 .824 I 259.3 1 12.78 .6.36 162.2 I0..36 1908.76 1 259.6 I 12.82 ~~ 1 1 1908.63- I 162.5 1 10.36 1908.61 1 195.09 I 121.24 2558. 8629. A and C. C and c. (10903 , 13mo). 1907.807 1908.613 1908.597 8.636 16.01 -633 8.652 1908.61 1 52.0 I 16.58 1908.36 I 7.1 I 15.82 1908.63 1 48.15 1 108.45 The other measures of the distant The proper motion of the principal The only measure of the distant star is : star are: star from the five positions by 2, A, 1880.50 194035 121:55 213 BI 02,A and #I(1832-1908) is: 1893.03 48013 109!11 2n Gla 1893.02 194.34 121.03 20 Gla. Measures 01087 in 24100 Greenwich 0.054 in 243.4. 2160. 2533. 2220. I Camelop. B 550. A and B. A and B. 2579. H 2253. A and B. 1908.613 1908.597 30700 10122 (8m3 , 12Y8). J533 .613 1 306.5 1 10.18 1908.766 1908.62 I 60.64 I 19.52 .633 307.5 10.16 1908.61 1 307.0 1 10.19 .788 A and C. (10m8). 1908.77 I 24.1 1 26.23 B and C. (10915). A and C. (9m6). 1908.766 I 009 51187 .769 I 10.6 52.00 1908.61 I 191.20 I 109.71 1908.61 I 215.15 I 149.89 .788 10.5 52-25 The only other measure of the distant 1908.77 I 10.7 5 2-04 star is: Earlier measures of the distant star are : 2591. 14 Aurigae. 1880.47 189093 110185 zn B1 1879.48 214058 15oY17 2n B1. 2 653. A and B. 2239. 57 Persei. Sh 44. I 1119 10.98 1908.652 3603 41'3 2 A and B. 11.10 .671 36.8 4.49 1908::;; I 198025 1 115156 1908.77 I 353.1 I 1.09 .689 38.0 4.42 I 98.5 2 I I 5.48 -709 39.1 4.49 .673 198.56 115.37 A and C. 1908.67 I 198.44 I "5.47 14142 There is retrograde motion in angle 14-50 B and C. (12 5). 14.67 with no sensible change in the distance. 1908.671 1 314083 5 1132 1908.77 1 224.7 '4.53 .692 314.13. 5 1-44 A and D. (10m3). 2166. Doolittle 7. 1908.68 I 3 14.48 51.38 A and B. A and C. 1908.671 21200 4617 I 1908.671 103186 .689 I 212.0 46.22 .692 1 :::y:: 103.52 1908.76 I 320.76 I 183.95 .750 211.9 46.82 1908.68 1 224.69 103.69 The only prior observation of the 1908.70 1 212.0 46.5 8 distant star is: A and D. (11m2). B and C. 1908.671 353087 76141 1880.50 320043 184152 2n B1. 3101 -613 1 353-85 I 16-60 According to Auwers the proper- 2.57 ,692 354.23 76.22 motion of the large star is nearly all 1908.71 I 217.2 2.79 1908.68 I 353.98 I 76.41 in Decl. ; while the measures of AB and 77 4301 78 AD agree in placing it principally in 2699. 2698. A and B is well known. Of the other stars the only prior measure is: RA. A continuation of these positions 1908.766 34609 31'122 should give the real motion, which is 324 346.4 31.09 1881.46 243000 197708 211 B1. certainly much larger than the meridian -843 I 346.9 31-08 The two positions give for the annual value. 1908.81 I 346.7 I 31.13 motion of AB: Measures of AB 01040 in 29106 Not fully measured since 1866. oY386 in 19203. D D AD 0.042 in 258.5 Auwers 0.014 in 334.1. Further measures are needed before this can be substituted for the meridian value. 2627. rZ Aurigae. The small star C is an exceedingly 1907.848 50082 96102 A and D. difficult and close pair. On only one 8.025 50.38 96.01 night could it be seen well enough to 1908.709 5045 138142 8.044 . 50.50 95.96 properly measure. .TI I 5.60 138.35 96.00 .128 1 5.23 I 138.11 C and a. (1om5 , 1om7). 1908.72 I 5.43 1 138.31 1908.750 I 17306 1 0159 1907.848 340092 I03148 A and C. 8.025 340.17 103.23 3130. 2831. 8.044 340.87 103.49 1908.636 75?7 11176 103.40 .652 1 75.7 1 11.88 1908.80 I 235.8 I 34.05 .67 I 75.4 11.77 My three sets of measures of the 1907.848 318063 108142 1908.65 I 75.6 1 11.80 small star C (1879-1908) give, as they 8.025 318.77 108.33 No recent measures. should do, practically the same value of 8.044 319.10 108.93 the proper motion of the bright star: 108.56 3238. 2872. AC 0%52 in 14008 5). A and B. AD 0.856 in 140.6. I 5768 1908.766 2170j I 1719 .I88 217.0 11.41 The proper motion of A, derived .804 216.8 11.21 from the several measures of B, C, and 1 I 2660. See 50. D, is as follows: 1908.79 I 217.1 I 11.27 1907.022 22000 3 1132 8.159 1 221.6 1 31.77 AB RA. -01051 Decl. -01194 A and C. (II~o). -0.207 284020 8.750 221.7 32.16 AC - 0.033 1908.766 203135 AD -0.057 - 0.204 .I88 284.10 203.59 1907.98 1 221.1 I 31.75 1 1 -0.047 -0.202 326 284.02 203.93 Unfortunately the original position of 1908.79 1 284.11 I 203.62 1897 depends upon a single night, and Therefore the corrected movement of therefore cannot be safely used .with the principal star is: The only other measure of the distant small star is: regard to relative motion. If this mea- 01207 in 19301. sure is correct, the large star has a 1879.53 286088 201!03 2n B1. proper motion of 1l161 in 10607, which 2746. B 71 A comparison of this with the recent is more than three times the movement measures implies a proper motion of A from meridian positions of 0:356. An- B and C. much larger than that given by meri- other set of measures a few years hence 190773 dian positions : will settle the matter. There is a third 190.66 Measures 01346 in 3003 14415 star about the same distance from I 90.50 Auwers 0.076 in 2fo..o. A; BC = 9904 : 14". 1908.64 1 245.44 190.63 It is possible that we have here an excessively rare example of a small star 2680. 2691. 1908.636 with a sensible proper motion, of which 30506 15:48 only a few instances are known in the 1908.147 30002 25166 -611 309.9 15-31 .689 entire heavens. It is not probable that -750 1 299.8 1 25.56 307.6 15.38 there is any very large error in the old .166 . 300.0 2.4'1 .150 306.8 15.19 value, considering the magnitude of the 1908.75 I 300.0 I 25.56 principal star; and still less probable No measures since 1866. that the faint comparison star is moving 79 80 at all. Therefore, the explanation must 3521. H.. be first looked for in errors of the micrometer positions. 1908.826 It may be suggested that the first 0.78 319015 132155 measures belong not to AC, but to BC. .843 319.24 132.11 1908.02 I 277.8 I 0.75 In that case my measures reduced to .845 3'9.47 '32.79 BC would stand, 28701I : 199132, which .862 318.98 132.06 would still leave too large a change. 3600. 8960. To show hereafter whether there is 1908.747 6607 21179 really any motion in C, I have con- .788 66.8 21.90 nected a third star: I I .824 68.2 21.80 C and D. (11m2 , 11%). 1908.79 I 67.2 I 21.83 1908:;:f I 164010 1120153 No measures since 1867. 163.80 120.21 -843 164.15 120.17 1907.788 4008 11234 1908.82 I 164.02 1 120.30 3606. 8962. 7.7 9 1 40.5 11.87 1907.807 24201 26100 8.063 41.6 12.20 242.4 25.80 3267. 8878. 8.671 I I 8.689 41.2 12.00 8.692 242.2 26.10 A and B. 1908.08 I 41.0 I 11.98 1908.39 I 242.2 I 25.97 A and C. (13m5). No late measures. 1907.79' 8.785 1908.78 I 330.83 I 23.84 3627. Espin 67. (8m7 , IO'PO). 8.788 A and C. (11"~). 1908.45 I 78.7 I 24.36 1908.74 7 No measures of AB since 1867. The 5.9 1 faint star has not been previously ob- 1908.18 I 309.0 I 5.87 served. The principal star is BD 1908.78 I 67.97 I 114.83 +42"1686. The brighter star BD +42"1685 is in the field. The other measures of AC are too 3653. 59 Aurigae. B 974. discordant to be used for the proper 3908. 21039. motion of A: A and B. 1908.636 22309 A and B. 1880.22 69023 113157 IU B1 22134 .652 224.0 1880.74 68.32 112.07 IU B1. 22.43 1908.769 20703 3114 .671 1 223.3 1 22.40 ,785 210.3 3.0 I .788 1908.65 I 223.7 I 22.39 I 208.6 I 3.09 1908.78 B and C. (13903). I 208.7 I 3.08 A and C. (8m5). 1908.747 356000 rooloo ,788 356.05 100.22 A04 356.38 100.14 -843 .843 356.25 100.14 1908.79 I 218.9 1 25.84 1908.78 I 310.97 I 127.60 No late measures of AB, and no other measures of the faint star. No measures of AR since 1869. C is BD +64"699. 1880.56 311035 127122 2x1 B1. 3685. 8978. 1908.728 3909. 21047. B and C. (11m4).

I 908.7 88 9603 26137 1908.75 1 90.14 I 16.70 .824 96.3 16-45 The measures of 8,d and 8 give A26 95.9 25.47 for the true proper motion of the prin- 1908.80 I 297.82 I 35.82 .843 97.2 26.26 cipal star: The principal star appears to have a 01039 in 22205. small proper motion. The measures of 81 4302 82 the third star will show whether or not The only other measures are those 6612. 02 268 rej. B has any movement. by Glasenapp. A and B. 1908.249 7502 19!25 3943. BIO50. 4159. OB(App.) 87. .a66 I 76.5 1 18.95 A and B. 1908.804 178038 64139 -383 75.9 19-81 1908.788 .826 178.63 1 64.50 1908.30 I 75.9 I 19-34 .846 178.78 64.14 .go4 A and C. ,843 1908.83 1 178.60 I 64.34 1908.249 258042 69183 1908.81 I 19.86 1 19.34 Distance apparently decreasing. ,266 1 258.18 1 69.81 A and C. (11m5). .271 258.50 69.89 1908.185 226013 1911330 4286. 02' (App.) 89. 1908.26 I 258.37 1 69.84 .I88 225.71 197.40 1908.102 82098 76169 1 1 A and D. (12m2). -843 225.91 191.48 .326 1 82.68 1 76.84 .689 1908.249 29038 84182 1908.81 I 225.96 I 191.39 82.78 76.79 1908.37 I 82.81 I 76.77 .a66 29.35 84.44 The prior measure is on a single -383 1 29.85 1 84.62 No change. night only, and change is doubtful. It 1908.30 I 29.53 1 84.63 should be remeasured later. From five positions of AC (1816 to 1880.28 225048 199138 xn BI. , 12m9). 1908), each on three or more nights, 1907.140 15801 44122 the apparent motion of the principal 3044. 21054. 8.063 157.7 43.74 star ": oYo80 in 5505. A and B. 8.788 158.2 43-72 1908.00 I 158.0 43-89 A continuation of the measures of AB and AD will show whether or not No other measures. there is any motion in C.

~908.18 I 291.8 I 18.63 4023. 02 Ursae maj. X 1306. B and C. (9"~). A and C. (9m4). 1908.766 267090 79140 1908.766 148010 no5113 .185 268.03 79.26 .I69 I 149.83 205.04 -788 1 267.95 1 19-80 .788 148.23 204.16 .3jo I 134.80 I 49.01 1908.18 I 267.96 I 19-49 1908.77 I 148.72 1204.98 1908.24 I '34.59 I 49-05 No change in AB, and probably none The following is corrected for error The four positions given, including in the other. of I 8oo in the angle:. South in 1829, make the apparent 1880.54 267015 79183 on BI. 1879.55 141097 206131 2n B1. motion of B: 01153 in 2100. 3973. 19 Lyacis. C 1062. It is obvious from the magnitudes, B and C. (11mo). this proper motion may be in either, 1908.766 287003 74120 or both. I have therefore connected a -169 1 281.46 1 74-52 1908.766 227094 93151 third star: .788 287.60 74.31 .769 227.88 93.26 :788 228.40 1908.71 I 281.36 I 74-34 93.01 A and C. (9m9). .826 227.65 93.34 1908.156 339078 I114104 The only other measures of this are 1 1908.19 227.91 93.29 ,370 340.02 113.99 uncertain in distance and angle: I I Prior measures for comparison are : 1908.26 1 339.90 1 114.01 1819.33 288045 73170 ID B1 1879.78 286.07 74.72 IU Bl. 1886.39 227033 90160 xn Eng. 1894.40 227.87 92.32 ID Eng. 6881. 21847. 4130. 08 175. The three positions give for the 1907.258 261% z5:95 proper motion of 23 Ursae maj. : 7.348 261.8 26.13 AB and C. (~omo). 1 1 8.192 262.8 25.88 1908.689 01105 in 6505. 194070 81155 1907.60 I 262.1 I 25.99 -109 1 194.85 1 81.53 B1 has two measures in 1879, but as ./28 194.18 81.46 the distances differ by more than I-, A and BD -9'3950 1908.71 I 194.58 I 81.51 they are not used in the computation. 1901.258 ADecl. = 190!'80. 6 83 4302 84

A and C. (IO~O). 7756. Espin 76. (9m7 , 9?9). 1908.271 24308 412 I 1908.149 1907.35 1 4400 -370 244.8 4-19 .383 243.4 4.20 -425 8.444 46.6 2.40 -403 241.1 4-23 1908.31 I 99.39 I 77.27 No other measures. 7864. H 2804. (9m8, IO~I).

A and B. 7422. z19g3. 1908.249 29208 32'147 1908.29I .288 292.6 33.00 1908.04 I 276.9 I 14.57 -33'- 292.7 3 1-41 1908.29 There seems to be no doubt of I 292.7 32.63 1908.35 I 71.6 I 15.89 change in angle and distance. They B and C. The four positions by 8,A and 8 are not given in BD. 1908,249 281?4 8184 (1830-1908) give for the proper motion .288 281.4 9-04 of A: 7872. 82128. 282.9 9.06 01027 in 11701. *33'- 1907.331 1908.29 I 281.9 8.98 A and E. (10m7). 7600. 252007. 8.310 1908.249 A and B. 1907.68 I 50.4 I 11.89 .288 1908.27 I 54.15 I 146.24 7893. 22131.

7302. 8945. 1908.35 I 325.3 I 34.85 I 908.425 A and C. (9m8). 1908.33 I 178.8 I 24.32 .460 1908.288 I 137068 1167188 No change in angle or distance. 1908.44 I 44.9 I '5.76 167.61 167.62 The seven positions by 8, A and 7942. 82147. 167.70 Doo (1879-1908) give for the corrected 1908.288 9301 6:2 2 proper motion of the principal star: One of the 2 components has a -33' 01302 in 30104. small proper motion, and it is impos- -370 sible to say which it is. I have, there- 1908.33 I 92.9 I 6.21 7341. 2 1963. fore, connectep a third small star, which is BD +13"3066. Remeasuring this A and B. 8016. 82167 rej. (8m1 after a proper interval will show what , 1om7). 1908.252 29402 417 0 the fact is. 1907.351 22208 18124 ,266 294.3 4.80 8.422 223.1 18.56 .288 294.1 4.67 I 1 I 1 8.425 223.0 18.67 1908.27 I 294.2 I 4.71 .82032. 1908.07 I 223.0 I 18.49 A and C. (12m5). 1908.266 116028 31112 1908.288 86008 63116 8032. 8 2169. 85.80 .288 I 115.75 1 30.89 -331 63.34 1908.25 2 .370 115.70 31.01 *370 85.78 63.40 63.28 1908.31 1 115.91 I 31.01 -383 85.73 -559 No other measures of the small star. 63-29 1908.46 I 98.1 1 14.93 The seven sets of measures of this No change. 7411. H 574. (9m0, 11m8). small star by 2,A, Je, Do and fi (1836 A and B. to 1908) should give a more accurate 8099. 26 Draconis. 8 962. 1908.249 value of the proper motion of the prin- 1106 cipal star than that found by meridian 1.2 I observations. From the micrometer we ,425 have : 1908.31 I 92.9 I 15.96 01276 in 25805. 1908.56 I 351.0 1 1.14 85 4302 86

8182. tp Draconis. B 1241. A and C. (IO?~). 8679. 22319. A and B. 1908.252 A and C. (romo). 1908.370 15'45 30154 -331 1908.288 27404 39161 .422 I 64.53 I 83-13 -383 I 5.88 30.50 -444 I 274.5 39.72 1908.33 64.34 82.88 1 -403 15-43 30.5 5 I I -460 274.4 39-95 1908.39 I '5.59 30.53 In the General Catalogue, the distance 1908.40 1 274.4 I 39.76 of AB by Doolittle in 1902 should read A and C. The measures of the small star furnish 27182 instead of 24182. No other mea- data for a very accurate value of the 1908.252 I 2 1060 92146 sures of AC. .288 122.00 92.28 proper motion of A. The measures of 2, d and #I(1829-1908) give: .33I 121.27 92.02 8404. 22291. I22.00 Measures oY043 in 3000 -370 92.55 1907.348 33907 27r11 I 908.3 I I 121.72 AG Berlin A 0.045 in 51.1. 91.33 7-35'. I 339.6 1 27-11 The proper motion of A as deduced 8.479 340.0 26.95 8616. 82329. from the five measures (1857-1908) of 1907.73 I 339.8 I 21-08 '908.597 the small star C should be more accurate Distance increasing. than that from any other data: .613 -633 07283 in 176015. 8440. 22298. 1908.61 I 44.6 I 4.17 Some of the former results from meri- A and B. No change in angle or distance since dian positions are: 2117 I 830. Newcomb 01268 in 17804 8732. 22368. Greenwich 0.279 in 111.8. 1908.42 I 179.3 I 2.11 A and C. I have measured a small star from A and C. (10m9). C. When these stars are remeasured I 908.403 40030 71"s hereafter, it is practically certain that .42 2 40.22 77.29 there will be no change. -425 I 40.02 1 17-32 1908.43 I 124.83 I 36.72 C and D. (12mo). 1908.42 I 40.18 I 77.32 Evidently a large error in the first I 908.3 70 19013 67137 The prior measures of C are dis- measure of this. .383 I 19-05 I 67.45 cordant in distance and further obser- .403 I 18.75 I 61-93 vations are required. 8822. 22397. 1908.39 I 18.98 I 67.58 1881.29 39042 17153 In B1 1907.542 26606 3198 1881.77 40.08 78.47 In B1. 8.520 267.7 3.94 8197. 82133. 8.537 I 267.7 1 4-15 A and C. (13m6). 8482. 22305. 1908.20 I 267.3 I 4.06 A and C. (10m6). 8923. 070. 1908:;;; 1 197022 1100?39 Ho 196.95 100.76 A and B. (5m6, 14m5). 1908.14 I 140.9 I 22.71 .425 197.18 100.76 1907.465 30600 873 I A and D. (13Y2). 1908.42 I 197.12 I 100.64 8.520 1 306.7 8.48 1907.597 23600 30120 The only other measures are: '907.99 I 306.3 8.39 8.331 235.2 30.83 1880.58 197060 102102 In BI. A and C. 8.482 236.3 I 1 30.53 If this distance was right, A should 1907.348 3 993 23149 1908.14 1 235.8 1 30.52 have a proper motion of 01058 in 22901. 1.465 40.2 23.68 The only other measures are by Lewis The measures should be repeated after 8.520 I 39.1 23-69 in 1905. a few years. 1907.78 I 39-1 23.62 8316. Ho 564. 8486. 82303. 8932. 83130. A and B. 1908.594 22401 2Y76 A and C. (10m6). 1908.331 32404 31123 -597 1 227.5 1 2.53 I 9~8.460 3 I 1030 I 8079 7 .422 326.1 31.94 .613 227.8 2-54 .463 1 311.40 1 180.90 1908.60 I 226.5 I 2.61 q531 1 324.2 1 31-30 .479 311.23 181.29 1908.43 I 324.9 I 31-49 Very little, if any, change. 1908.47 I 311.31 [ 181.05 6. 4302 88

9308 82521. A and D. A and B. 1908.5 I8 3807 37153 3 7.32 1908.444 .460 38.5 37.92 1908.52 I 38.5 .479 37.59 1908.46 I 38-11 I 24.94 B and D. 1908.5 I8 2809 35!'5I A and C. (9415). .520 I 28.6 1 35.16 .537 I 29.5 I 35-12 1908.52 I 29.0 I 35.46 Further measures are needed to de- 1908.46 I 322.51 [ 70.19 termine the true relation of these stars. A and D. (9415). 9399. 08 374 rej. 1908.444 .460 1901.542 29608 18162 a479 I 64-10 I '49.59 8.310 1 296-5 1 18.77 8.444 296.9 18.71 1908.46 1 63.99 I 149.61 1908.12 1 296.7 I 18.72 The proper motion of the principal The proper motion of the large star star (Bradley 2462) as given from meri- is given in Groombridge: dian observations seems to be certainly wrong in amount and direction: 01039 in 9808. Auwers 01075 in 23708 9404. ,a Aquilae. fl 653. AGBerlinA 0.074 in 223.3. A and B. The five sets of measures of AB by 2, A, Per and fl (1829-1908) give for 1908.460 280003 29134 this motion: .482 1 280.40 29.20 .518 279.92 29-14 0!'041 in 17804. 1908.49 I 280.12 29.23 This is confirmed by the measures of AD which give: A and C. 01043 in 16102. 1908.460 292035 28f86 .482 I 292.00 29-32 1908.444 104085 23165 The only prior position of this star is: .518 291.00 29.02 .460 106.30 23.91 1878.61 64048 149146 3n B1 1908.49 I 291.78 29-07 .419 105.48 24.10 .482 105.83 Of AC there is only a single measure, A and D. 14.50 and later observations should be made 1908.460 345015 63106 of both. -482 345.57 63.04 There is a 14'" star about the same I I .518 345.48 62.91 distance as B from A, 7305 : 2510. 1908.49 I 345.60 I 63.00 A and E.

.5 I8 1907.523 10401 6116 1908.49 70.32 179.56 7.542 105.7 6.5 I I 1 8.370 103.6 6.~9 From the measures of the several 8.482 102.9 6.12 companion stars, we have the following for the movement of A: AB RA. +01250 Decl. -O?IIO AC +0.227 -0.166 AD +0.238 -0.111 AE +0.244 -0.167 +0.240 -0.138 4302 90

Therefore the true proper motion of It is a coincidence worth mentioning 9997. Espin 132. p Aquilae is: that the star given in Pos. Med. is a A and B. (8m8 , 9mo). pair very much like the other except 07277 in 11909. 1907.638 8204 5:45 in magnitudes. 8.252 1 83-5 1 5-79 9438. Espin 129. A and B. (9mo , 13410). 8.310 81.3 5.5 1 1908.537 15605 I4172 1908.09 I 82.4 I 5.58 A and B. (9m4 , 1om3). -573 158.0 14.17 A and C. (876). -515 158.5 14.87 1 I 1907.638 6005 37770 1908.56 I I51.1 I 14.79 3.5 2 8.252 1 59.9 1 37-79 1908.32 I 224.2 I 3.36 A and BD -13~5536. 8.3 10 60.6 31.53 A and BD +5z02458. 1908.520 192023 131164 1908.09 I 60.3 I 37.67 ~531 I 192.40 1 131.89 B and C. -559 192.41 131.42 I 907.638 1908.54 192.37 131.65 I I 8.252 It is evident that neither of these 1908.32 I 273.30 1 71.83 8.370 1.0 stars has any proper motion: 5 1908.09 1 56.8 There is an error of IO in the de- 1864.77 192005 131!26 in A. clination given by Espin. It should be +5z0 33'. The principal star is 10061. A.G. BD +5z02459. 9765. ~Cygni. 82605. A and C. (13m8). 1908.575 I8504 7l2o *597 185.0 7.25 9607. 2 2578. 1908.425 5506 18165 .633 186.0 7.30 -444 19.11 1 1 and C. (12m0). 1908.60 I 185.5 I 7.25 A .460 1 i::; 1 18.76 1908.463 351053 45145 1908.44 I 54.6 I 18.84 -419 351.60 45-41 This faint companion has not been 10100. B 2666. -482 351.81 45.61 I 1 previously seen. A and C. 1908.41 I 351.61 I 45.49 A and D. (10m4). The only other measures are those given in G.C. by Glasenapp. 1908.422 A and D. (9m5). .444 1908.55 I 207.5 I 34.32 1908.463 25 1028 143135 1908.43 I 61.33 I 165.36 The distance by T is t0.o small. -419 1 251.20 1 '43.35 Of the distant star we have: 1894.59 20704 34127 2n Gla. .48a 151.30 143.26 1880.14 61050 '163Y20 2n B1 1908.47 I 251.26 I 143.32 The two positions give for the ap- Of this we have: parent motion of A: 1908.537 209078 537go 01078 1880.10 251032 142185 zu B1 in 229Oo. -573 210.25 54.24 The apparent change in the distances Further measures are required to im- .575 209.80 54.22 of both stars requires confirmation. prove the value previously given. .594 210.18 53.61 There is a 14 magnitude star near C, 7500 : I 116. 9863. 22622. A and C. (10m5). 10171. H 1510. 9766. 22602. 1908.520 30801 17:18 A and B. (8"s 8'3). .537 308.8 16.95 , -559 1 308.9 1 11-35 4f65 1908.54 I 308.6 I 17.16 1908.56 I 148.5 1 12.32 -594 I 149.9 I 4.52 1908.58 1 150.1 I 4.56 Struve's place of 8 2602 in Pos.Med. 9966. H 2936. (8m8 , 9411). belongs to another star ~~40'f, BD 1908.575 25200 12:53 A and C. (12m6). -13'5537. While 2 2602 is No.5522. .633 I 252.1 I 12.60 6170 The place in Part I should be: .636 252.0 12.73 RA. = 1gh4grn34' 1908.61 I 252.0 I 12.62 6.46 Decl. = -13~40'. No other measures. 1908.58 I 342.3 I 6.56 91 4302 92

A and D. (11412). 10216. S 749. 10325. H 1535. A and C. A and B. 1908.44 I 3 I 605 2 43156 479 316.43 43.55 1908.58 I 322.6 I 31.21 482 316.48 43.67 .5i8 316.02 43-73 1908.56 I 246.8 I 16.93 43.63 A and C. 10180. 08 (App.) 207. C and D. (1om6 , 1om7). 18154 A and C. 18.62 1908.53 7 18.65 1908.56 I 153.8 I 8.60 -573 1908.48 I 240.06 I 77.21 The proper motion given A seems 1908.56 I 63-36 I 93-91 There is a 13415 star near C, to be doubtful, at least in amount. The distance of B should have increased In Part II p. 1082, in the proper 19705 : 19%. about 1" since 1902. motion of A for if086 read 01086. A and D. The four sets of measures of C now available (1876-1908) give for this 1908.479 266023 97Y59 10383. Hn 39. -482 266.33 97.44 7162 motion: 01083 in 5306. .518 I 266.55 I 97.11 7.61 While C is a bright star, there is no '908.49 I 266.37 I 97.38 7.93 reason for supposing that it has any 1908.54 I 176.2 7.7 2 sensible proper motion. For greater D and d. (13416). certainty, I have measured the faint 1908.4 79 5778 star D. .482 08 533. .518 5.80 1908.67 I 30006 17150 C and D. (13413). 1908.49 I 20.8 I 5.79 a673 300.3 11-43 .689 301.6 17-46 We have the following of two of .692 300.2 '7.53 these stars: 17.48 1908.56 I 163.47 I 57.44 AC 1891.79 314002 44187 20 Eng. AD 1891.79 266.25 100.37 xn Eng. 10426. 82717. If the measures had been made on a A and C. (9417). Lewis 10183. 34. (xo'P4, 1om6). greater number of nights, the result of 1908.633 52083 45"O a comparison with the present mea- .636 53-10 45.65 sures would be more accurate. .652 I 52.83 I 45.67 4.43 AC RA. -0l130 Decl. -01024 1908.64 I 52-95 I 45.74 1908.56 I 174.9 I 4.42 AD -0.178 - 0.024 These stars, too faint to be in BD, -0.154 -0.024 10447. 82718. are about 6' n of the 8417 star, BD Hence the most probable proper A and B. +42O3725. This does not agree with motion of A is: 1908.67 I 8605 8145 the description by Lewis in magnitudes, 8.46 in -613 or distaoce which is given as 1155. As 01x56 261O1. .689 86.1 8.95 nothing else could be found in this vi- 1908.68 I 86.5 8.62 cinity, there must be a large error in the place, or in the measures. A and C. 1908.671 345070 I 66?99 1908.633 198023 roo:og .689 345.38 167.07 .636 198.40 xo0.11 .692 345.36 167.09 .652 198.00 100.54 1908.68 I 345.48 167.05 .671 198.30 100.00 10459. /3 674. 1907.788 10209 I 148 1908.15 I 80.2 I 4.22 7.807 103.8 1.70 The only other measures are my own 8.573 I 102.7 1 1-45 in 1889. 1908.06 I 103.1 I 1.54 93 4302 94

10612. E Cygni. B 676. 10727. @ 157. 10880. B 163. I 908.652 298063 40788 A and C. AB and C. (13m6). 298.18 *655 41.09 1908.5 94 6700 IO:OS 242007 28Y94 .67 I 298.25 40.7 4 .636 66.1 9.76 242.00 28.92 298.62 1 1 1908::75: 1 I -673 40.69 -- .671 67.3 I 10.16 1908.56 I 242.03 I 28.93 1908.66 298.42 I 40.85 .673 I 67.1 I 10.03 The proper motion of E Cygni from 1908.64 I 66.9 I 10.00 AB and D. (13mo). nine sets of complete measures (I85 2 160097 50108 to is: 1908) 10747. @ 680. 160.60 50.22 oY504 in 4807. 1908:i:i 1 I AB and C. 1908.56 I 160.78 I 50.15 10526. Hn 41. 1908.597 No other measures of these faint stars. .636 A and C. .652 22.78 1908.655 26009 8!26 1908.63 I 33.2 I 22.79 I 908.5 20 9007 82176 .671 I 262.4 1 8.14 -556 9.04 83.06 261.4 8.0 I .673 10776. 2 2763. -559 8.87 82.67 1908.67 1 261.6 I 8.14 9.20 83-15 1907.559 29307 I7f22 -573 A and B. .578 293.0 17.06 82.91 3"s .581 1 293.0 1 17.30 10017. H 281. 1908.67 I 235.7 I 3.5.9 10836. 2 2779. 10526. H 2998. A and E. A and B. (9m5 , 9m6). 1908.62 I 335.23 I 14.01 1907.695 14104 5180 8.573 140.4 6.18 8.633 1 141.7 1 6.09 1908.61 I 180.43 I 17.13 10820. L: 2787. 1908.30 I 141.2 I 6.02 As it is uncertain which of the Struve A and B. components is moving, I have connected A and C. (10m6). 1908.594 20022 22l72 with a third small star. -597 20.32 22.53 A and C. (12mo). -633 I 20.17 I 22.68 1908.63 I 133.15 I 99.10 1908.594 1908.61 I 20.24 1 22.64 The principal star is BD -21~5839 .597 A and C. (8Y7). There is no relative change. To *633 determine whether or not the alleged 1908.61 I 66.39 I 58.29 1908.594 large proper motion is real, I have connected a third small star. -633 10846. z Cygni. 1908.61 I 95.09 I 70.15 A and D. 10546. 15 Delphini. Distance of C larger in first measure. 1908.520 210066 162l60 A and C. (xomg). .556 1 210.67 162.83 -559 210.57 162.44 1908.54 I 210.63 162.62 With the five positions by 02 (185 I 1908.41 I 81.87 I 108.04 to 1908), we have for the proper motion The prior measures are: of z Cygni: 0:475 in 1708. 1886.93 81015 109134 20 Eng 1894.36 81.39 108.64 20 Eng 10847. H 1628. (9m4 , 9m6). 11128. Espin 102. (8m1 , 10m8). The proper motion of the principal star is: 1908.57 5 Measures 01078 in 3404 Paris 0.122 in 31.0 .613 Porter 0.113 in 26.0. 1907.91 I 252.9 I '5.24 1908.59 I 36.3 I 11-39 95 4302 96

11147. Espin 140. (8mo , 13~). 11306. H 5298. (91115 , 10m2). 11428. 20 Pegasi. H 289. A and C. 1908.636 3120.4 60176 1908.575 33107 11763 .671 I 312.3 1 60.17 .597 332.0 11.66 .673 312.2 60.43 .613 1 331.6 I 11.53 1908.66 1 312.3 1 60.45 1908.55 I 324.82 I 53.10 1908.59 I 331.8 1 11.61 There is a 13m5 star between the The three positions of the companion nearer A. [1878-1908)give for the proper motion A and B. (14mz). two, A: in 1908.613 18203 615 7 01080 12205. .636 183.5 6.62 1 I 11355. Battermann. 1908.62 I 182.9 I 6.60 11504. 2' 2865. A and B. The very faint companion, B, was de- 1908.655 18801 21127 tected by Mr. Oliver T.Lee of this ob- 1908.537 16205 1154 .671 I 188.9 I 21.40 servatory. .556 I ' 162.8 1 1.54 .673 189.0 21.49 -573 162.9 1.56 1908.67 I 188.7 1 21.39 1908.56 11162. Ho 464. I 162.7 I 1.55 No third star near enough to measure. 1908.636 10404 17154 A and C. .652 103.6 17.19 1908.556 30202 22!'83 11620. Ho 470. .671 I 104.3 11.85 .573 300.2 22.87 1 12168 1908.65 I 104.1 I 17.73 I I 1908.655 35209 1908.56 I 301.2 I 22.85 .67r 351.4 12.43 The following measure not given in A and B have the same proper motion, . .689 1 350.6 1 12.32 G. C. : while C is fixed in space. 1908.67 I 351.6 I 12.48 1906.62 103?9 17155 3n Doo. The companion is very faint. 1906.65 35301 11'192 3n Doo. 11172. H 3050. (9?5 , 10m6). 11364. 02 454. 1908.633 4601 23717 A and C. 11669. H 1741. .636 1 46.7 I 23.10 .652 46.0 23.38 1908.597 306098 a5194 1908.64 I 46.3 1 23.22 .636 1 306.60 1 26.06 ,652 306.23 26.20 The distance in the prior measure is 1908.61 I 264.80 I 43.17 much too large. 1908.63 I 306.60 I 26.07 No change since 1895. Proper motion. 11236. OX (App.) 224. 11668. 02 465. 1908.709 5"o 58753 11396. Sh 336. 5-41 A and B. -711 1 1 58-50 A and B. -731 5-51 58-56 1908.769 224025 99188 .788 1 224.47 1 99.11 14.42 .804 224.91 100.11 11303. B 2834. 1908.61 I 321.5 I 14.31 1908.79 I 224.56 I 99.92 and A and C. (13912). A B. One of these stars has a proper 23501 17%~ '908.575 293% 4y33 motion in declination of about 1908.597 07x0. .636 234.8 18.28 *594 293.6 4.40 Both are given in some of the catalogues: 1 1 -613 293.7 4-44 1908.62 I 235.0 I 18.05 I Weioe I 1825 22502 103!'7 No other observations of C. 1908.59 I 293.6 I 4.39 1885 224.6 102.1 AGLeipz.II A and C. (13mo). To determine which is moving, I 12100 1908.575 26114 have connected a thud 12~star: .594 121.1 25.83 1908.594 19800 9Y43 121.1 198.7 10.22 .613 I I 26.19 * A and c. .597 .636 I 1908.59 I 121.1 I 26.05 1908.785 102O23 85131 199.1 9.4 .652 200.4 9.14 There may be a slight increase in .788 101.15 85.24 angle and distance. No other measures .824 1 102.33 I 85.42 of c. 1908.80 I 101.90 I 85.32 97 4302 98

11596. Hd 170. 11686. 08 (App.) 232. I have measured a third star for an 1908.636 24105 7"9 A and B. independent determination of the proper motion of the principal star. *652 1 242.8 1 1.39 1908.709 191053 67186 .655 242.0 7.18 .71r 191.23 67.97 1908.65 I 242.1 I 7.32 .728 191.15 1 68.13 11882. Espin 106. (9m2 , 9m7). The apparent change is not confirmed. 1908.72 I 191.30 I 67.99 1908.5 18 26607 8'102 A and C. (11m4). .520 I 267.9 1 7.98 ' * 53 7 26 7.3 8.06 11601. A.G. 281. (8m8 , ~omo). 1908.728 268022 175102 1908.52 I 267.3 I 8.02 1908.71I 2 200 2143 ~750 I 268.33 I 114.57 .788 268.60 174.24 -750 20.7 2.44 11884. Ho 187. .766 1 20.1 ! 2-41 1908.76 I 268.38 I 174.61 1908.750 28605 18191 el69 1 285.7 1 18.77 . .788 286.2 18.6~ 11602. OX 467 rej. 1908.77 I 286.1 I 18.78 1908.709 27401 22196 1908.482 10403 3125 .520 105.0 3.33 .I11 274.0 22.86 11906. 2 2932. .728 1 273.6 I 23.06 -537 TO44 3.1 I 104.0 3.20 1908.72 I 273.9 I 22.96 .556 A and B. .573 104.6 I 3.12 1908.750 28007 20112 11641. B 2894. ,766 I 281.2 20.01 .769 281.4 20.16 A and C. (9m6). 1908.482 59050 43:46 1908.76 I 281.1 20.10 175073 221'140 .520 59.53 43.55 1908~~:~ 174.47 221.55 A and C. I I -537 59.33 43-48 1908.55 I 175.10 I 2~1.47 1908.7 50 I 208 30102 -556 59-30 43-54 .766 13.1 30.06 59.57 I -559 43.39 B and C. (9mo). -769 12.2 29.92 1908.76 ] 12.7 30.00

12019. 15 Lacertae. 8 451. 1908.56 1 174.41 1206.62 A and B. For this star we have: 1908.518 132023 28134 i880.70 174000 204183 2n B1 -520 1 132.78 1 28.08 *537 132.28 21-93 11659. 02 469. 1908.52 1 132.43 I 28.12 11821. Ho 617. (8410, 13m5). A and C. (11m9). 190 1*I 72 5303 17149 1908.750 284077 29152 1908:;:: 1 309089 I 102186 284.36 7.807 '7.91 -769 29.96 8.5 I 8 11.62 310.00 102.91 .188 284.65 ! if:; 1 .537 29.89 1908.03 I 52.8 I 17.67 309.67 102.89 .804 285.30 29.56 1908.52 I 309.85 I 102.89 1908.7 8 Probably without change. A and D. (12m3). seven positions, on 22 nights, From 11866. 8 2928. 1908:;:: 227065 127'140 the apparent motion of A is: I A and B. 227.85 127.92 01047 in 12804. .537 227.70 127.78 1908.671 31101 318 7 1908.52 I 0~7.73I 127.70 To make certain that the motion is -673 1 311.1 1 3-98 all in the larger star, I have connected .692 312.2 3-19 No other measures of C and D. a third 12m2 star: 1908.68 I 311.5 I 3.88 A and C. A and C. (11m9). 12042. 22955 rej. (7F7 , II~I). 1908.7 50 51043 52190 1908.537 33707 22186 a788 1 52-31 1 52-92 ~556 331-8 22-95 .804 52.43 53.61 -559 I 337.5 1 23-04 1908.78 I 52.08 I 53.14 1908.70 I 245.20 I 97.90 1908.55 I 337.7 I 22.95 7 99 4302 I00

Rejecting my single measure in 1871, 12361. H 3193. (9m5 , IO~I). ie three positions give for the proper 1908.573 21803 34134 lotion of BC, which is the same as 1908.750 247080 132112 .633 217.8 34.55 iat of tp' Aquarii: ,636 218.5 34.56 .f85 247.97 131.98 I I in .788 . 248.15 131.12 01375 8904. 1908.61 I 218.2 1 34.48 .804 247.90 131.5f In addition to the two values given *om meridian positions, we have : Auwers 01350 in. 9008.

12272. H 3180. (9414, 12m2). 12214. Ho i97. 1908.636 26500 23lo1 AB and C. .652 I 263.7 1 23.05 1908.56 I 356.8 I 20.14 1907.879 328042 41113 .671 263.4 23.07 A and h 2241. 8.460 328.48 40.76 8.482 328.27 40.98 1908.444 24303 50107 .482 I 243.6 1 50.38 1908.27 I 328.39 40.96 .518 243.4 50.66 AB and D. 1908.48 I 243.4 I 50.37 1907.879 280048 49178 This is a well known planetary nebula 8.460 280.48 49.63 1908.750 71034 76110 Dreyer 7662) with the minute star in 8.482 280.67 49.84 .824 71.12 75.46 he center, which is characteristic of all 1908.27 1 280.54 49.75 A26 71.28 75.54 iebulae of this class. The central star The measures of the distant stars are .882 71.83 75.80 vas rated 15"' in my measures at Mt. discordant in distance. Jamilton. This, like many of the cen- 1908.82 I 71.39 I 75.73 ral stars in the planetary nebulae, and AC 1906.68 32901 41167 20 Do0 These measures are continued to im- iimilar attendants to bright stars, is a AD 1906.68 279.1 50.27 211 Doe. wove the proper motion of the system. ,est of atmosphere rather than aperture, md at times beyond the reach of the 12234. 2 2993. 12286. 8 Andromedae. @ 717. argest telescopes. On the occasion of ;he foregoing measures it was not well A and C. A and C. (10913). seen owing to the unsteady condition 1908.826 130061 2i9128 Df the air. The prior measures of the -845 1 131.04 1319.37 nebula, and the principal star of H I 87 7 .862 130.95 219.41 will be found in Publ. L. 0.11 p. 167. 1908.58 I 115.47 I 122.29 1908.84 1 130.87 1219.35 I'here is no suggestion of any change C is BD -9"6152. With these me* The following is the only prior ob. in the last fifty years. sures the proper motion of AB is: rervation : 01455 in 8906. 1880.28 130067 219141 20 B1 12366. See 485. 1908.671 13103 5103 12236. H 981. (9m0, 12"s). 12351. H 5398. (9934, 9m6). .826 1 129.6 1 5.15 1908.633 1908.75 I 130.4 I 5-09

29-40 12384. OH (App.) 246. 1908.54 1 280.6 I 17.89 1908.68 I I 29-33 3.5 A and B. This pair was wrongly identified ir This is BD - I 8"6306. The G.C.placc 1905, and the measure given in Part1 is substantially correct. No other mea 1907.810 114033 86T74 114.23 86.80 belongs to an other star. sures. ,845 .865 I 114.45 1 86.80 12267. tp' Aquarii. #I1220. 12353. H 3192. (9Y4, 9T7). 1907.84 1 114.34 I 86.78 BC and E. 1908.633 11606 27130 A and C. (10"). .671 116.3 27.23 1907.845 156038 135147 26.96 .750 1 116.6 1 7.865 156.68 135.82 1908.68 I 116.5 I 27.16 8.479 156.47 135.51 1908.63 I 357.7 I 18.35 No other measures. 135.60 101 4302 102

B and C. A and C. (9Y6). '907.845 195035 92141 7.865 195.68 92.02 8.479 1 195.93 1 92.51 1908.06 I 195.65 I 92.33 1908.53 I 243.39 I 34.48 The third star is connected to get This was discovered by Esph in I 908. hereafter the separate proper motions of the large stars. 12696, Hn 60. BD +43"1402. 1907.695 I 31605 I or31 12400. H 3197. (9417 , 9F8). RA. = 5h51m4s 8120 Rapid motion; a difficult pair. Decl. = +43"58!3. 8.19 I 90a.079 a91 1908.68 I 308.7 I 8.23 ,633 4.3 2 Apparently unchdnged. 1908.33 I 89.4 I 4.43 The following pairs are of recent Discovered independently by Edpih, 12441. 8 388. discovery, and are not given id the General Catalogue. but pteviouslp recdrded as Aitlked 1551. BB -9O4062. (9?2 , 12F5). BD +47"1122. RA. = S4hglm10' 20.25 1908.56 I 333.3 I RA. = ~~8~46~ Decl. = -9" 22' 19878. 02 507. Decl. = +47O 1C7, 1908.156 25308 16,lr)8 A and B. A and B. (9m9 , 10m4). .I92 255.3 11.22 .266 1 253.6 I 11.29 1908.20 I 254.0 I 11.16 0.64 0.97 Discovered by Abetti at Arcetri wheir 1908.74 1 269.0 I 0.65 1908.72 1 252.2 I 1.01 observing an asteroid. Perkes Observatory, Williams Bay, Wisc., I 908 Nov. 30. S. W.Bumham.

Photograpbische Aufnahmen von kleinen Planetea und Jupitersmonden.

Objekt IM.Z.Kgst.1 a 1909.0 I d 1909.0 I Gr. 1 Bb. Objekt Ihf.Z.Kgst.Iar 1909.0 1 d 1909.0 I Gr. 1 Bb.

1909 JaO. 10. (416) Vaticana 9'' 1m4 7h3am3 +36O55' 12.0 L (28) Bellona I 6h43m11 5h53m91 +lzO 2'1 1om I W '909 Fo 10 49.3 5 52.3 +12 8 14 W (64) Angelina 12 27.4 9 13.0 +16 12 9.7 IC 1909 Jan. 18. (526) Jena W 9 15.9 +I5 27 12.8 W (566) Stereoskopin 7 50.9 8 38.7 +23 14 11.5 L (89) Julia 9 23.8 +IS 17 10.8 w 1909 FO (neu) 7 51.8 5 52.8 +12 6 14 W VIII. Jupitenmond 13 :3.3 10 56.0 + 7 42 116.5 w (601) [1906 UN] 8 19.0 6 '5.3 + 2 49 13.0 K 1909 FP (neu) W 6 17.9 + 2 11 13.1 W (289) Nenetta I1 55.0 7 28.2 +12 30 I 2.9 K (600) [1906 UM] W 7 30.2 +I4 54 13.1 W t909 FQ (neu) 3 7 38.9 +15 12 I 3.6 W rgog FR (oeu) 3 W 7 41.0 +16 34 12.6 (324) Bamberga 8 50.9 7 34.9 +32 17 9.7 L (64) Aogelina 12 31.4 9 '3.9 -1-16 9 9.1 L 1909 FK 9 52.6 6 36.0 +35 40 1t.3 k (89) Julia W +IS W 9 24.8 16 10.8 1909 FL W 6 37.8 +33 I 12.6 s (65 2) Jubilatrix 12 7.0 +a0 28 13 31.3 14 W (5 28) Rezia 3 6 39.3 -1-37 16 13.2 > Tiigl. Bewegungen: (566) -om8 +4', (601) -om6 1909 FM W 6 41.4 +32 52 13.0 w +2', FP -om6 +3', (289) -om9 +2', (600) -079 +4', (562) Salome 12 46.6 7 56.4 +32 17 13.3 K FQ --Yo +7', FR -om9 -1'. (362) Havnia > 7 58.0 +34 7 I 1.0 w 1909 Jan. 19. (187) Lamberta I 9 1.4 I 7 19.5 I +38 49 111.5 I L