NO. 40. THE SYSTEM OF LUNAR CRATERS, QUADRANT II by D. W. G. ARTHUR, ALICE P. AGNIERAY, RUTH A. HORVATH ,tl l C.A. WOOD AND C. R. CHAPMAN \_9 (_ /_) March 14, 1964 ABSTRACT The designation, diameter, position, central-peak information, and state of completeness arc listed for each discernible crater in the second lunar quadrant with a diameter exceeding 3.5 km. The catalog contains more than 2,000 items and is illustrated by a map in 11 sections. his Communication is the second part of The However, since we also have suppressed many Greek System of Lunar Craters, which is a catalog in letters used by these authorities, there was need for four parts of all craters recognizable with reasonable some care in the incorporation of new letters to certainty on photographs and having diameters avoid confusion. Accordingly, the Greek letters greater than 3.5 kilometers. Thus it is a continua- added by us are always different from those that tion of Comm. LPL No. 30 of September 1963. The have been suppressed. Observers who wish may use format is the same except for some minor changes the omitted symbols of Blagg and Miiller without to improve clarity and legibility. The information in fear of ambiguity. the text of Comm. LPL No. 30 therefore applies to The photographic coverage of the second quad- this Communication also. rant is by no means uniform in quality, and certain Some of the minor changes mentioned above phases are not well represented. Thus for small cra- have been introduced because of the particular ters in certain longitudes there are no good determi- nature of the second lunar quadrant, most of which nations of the diameters, and our values are little is covered by the dark areas Mare Imbrium and better than rough estimates. When the diameter lacks Oceanus Procellarum. The density of craters over precision, it appears in parentheses in the catalog. these extensive maria is too low to provide an ade- One additional map convention should be noted. quate network of landmarks. Accordingly, we have When a name on the map is enclosed in brackets, it placed increased emphasis on isolated elevations, may be assumed that there are no associated lettered many of which have been anonymous until now. In objects. This convention eliminates the ambiguities our map a large number of these have been indicated which must occur when one named object lies en- by lowercase Greek letters, following the conventions tirely within another. of Blagg and Mtiller's Named Lunar Formations. To avoid congestion in some limb regions, a few 2 D.W.G. ARTHUR, ALICE P. AGNIERAY, RUTH A. HORVATH, C. A. WOOD AND C. R. CHAPMAN anonymous craters have been omitted from the map. Our Langley is Schmidt's Regnault while our Aston The following are the new names introduced in is Blagg and Miiller's Ulugh Beigh E and M_idler's the second lunar quadrant: Ulugh Beigh. It should be noted that the designation Hermite French mathematician Otto Struve is now shortened to Struve since there is no other crater with that name. Sylvester British mathematician Poncelet French mathematician The maps of Comm. LPL No. 30 have now been Brianchon French mathematician published in one sheet (Lunar Designations and Positions, Quadrant I, D. W. G. Arthur and A. P. Desargues French mathematician Eddington British astronomer Agnieray. University of Arizona Press, April 1964), Cremona Italian mathematician and users of the latter publication should note that Boole British mathematician six names in the libratory zone are not mentioned in Comm. LPL No. 30. These are : Volta Italian physicist Markov Russian mathematician Goddard American physicist Moseley 1 British physicist Jansky American radio engineer Stokes British physicist Liapunov Russian mathematician Langley American astronomer Rayleigh British physicist Bunsen German chemist Riemann German mathematician R6ntgen: German physicist Boss American astronomer Aston British physicist The above formations were not designated in Named Russell American astronomer Lunar Formations. Balboa Spanish explorer The maps accompanying this Communication Dalton British chemist and physicist are extremely crowded in the limb region, and it Einstein American (German-born) physicist is clear that the standard orthographic projection is Bohr Danish physicist not suitable for the observation and identification Planck: German physicist of objects near the limb. The same is true of con- Fermi 1 American (Italian-born) physicist formal maps or maps based on rectified photographs, Hedin Swedish explorer since these do not bear much resemblance to the Some of these were designated by letters in foreshortened view presented to the observer. There- Named Lunar Formations, as follows" fore, we have commenced a series of special limb maps that show each limb region under favorable Sylvester = Philolaus P conditions of libration. These will supplement the Poncelet ---_ Anaximenes F maps in orthographic projection that accompany the Brianchon z Carpenter C various parts of The System of Lunar Craters. Pascal = Carpenter D The work was supported by the National Aero- Desargues = Anaximander C nautics and Space Administration under Grant No. Markov z Oenopides A NsG 161-61. Russell = N. component of Otto Struve Eddington = Otto Struve A :These craters lie beyond the mean limb and are not included in our catalog or shown in the maps. See Rectified Lunar Atlas by E. A. Whitaker et al., University of Arizona Press, I963. THE CATALOG Ref. B & M Designation × P D K C B C.E. 20008 858 Murchison -.002 +.089 +.996 -0.i +5.1 33.31 57.90 4f aMC 0 20014 .019 .047 .999 i .I 2.7 5.79 10.06 3 aMC p 20014A .019 .044 .999 i.I 2.5 2.91 5.06 2 pMC 0 20017 1229B Pallas C .019 .078 .997 i.i 4.5 4.07 7.07 2 C 0 20022 Pallas V .027 .029 .999 1.5 1.7 1.68 2.92 i pM 0 20025 .020 .053 .998 I.i 3.0 2.70 4.69 2 C 0 20026 Pallas F .023 .060 .998 1.3 3.4 11.03 19.17 4f aMC 0 20026A Pallas W .021 .062 .998 1.2 3.6 2.15 3.74 I pMC 0 20027 Pallas E .025 .070 .997 i .4 4.0 15.82 27.50 4f aMC 0 20028 Pallas H .027 .081 .996 i .6 4.6 3.07 5.34 i C 0 20029 1225 Pallas .028 .096 .995 1.6 5.5 28.52 49.57 3 C P 20036 .035 .063 .997 2.0 3.6 15.31 26.61 5f aMC 0 20037 .036 .074 .997 2.1 4.2 6.99 12.15 4 C 0 20044 1229A Pallas D .045 .041 .998 2.6 2.3 2.35 4.08 I pMC 0 20047 1227 Pallas B .045 .073 .996 2.6 4.2 2.20 3.82 I C 0 20047A .046 .074 .996 2.6 4.2 13.12 22.80 4 C 0 20059 Pallas X .056 .090 .994 3.2 5.2 1.64 2.85 i C 0 20069 1218A Bode L .066 .098 .993 3.8 5.6 2.66 4.62 I C 0 20070 1248A S_rmnering M .078 .000 .997 4.5 0.0 15.91 27.65 5f aMC 0 20087 .086 .076 .993 4.9 4.4 22.90 39.80 5f aMC 0 20092 .097 .029 .995 5.6 i .7 2.18 3.79 2 pMC 0 20115 1214 Bode A .020 .156 .988 1.2 9.0 7.10 12.34 i C 0 20119 Ukert J .010 .191 .982 0.6 ii .0 1.88 3.27 i C 0 20136 1217A Bode K .039 .162 .986 2.3 9.3 3.48 6.05 i C 0 20140 1226 Pallas A .040 .104 .994 2.3 6.0 6.09 10.59 i C 0 20141 1212 Bode .042 .117 .992 2.4 6.7 10.69 18.58 i C R 20151 .059 .118 .991 3.4 6.8 2.19 3.81 2 C 0 20152 1216 Bode D .057 .126 .990 3.3 7.2 2.15 3.74 2 C 0 20155 1215 Bode B .053 .152 .987 3.1 8.7 5.87 10.20 I C 0 20161 1213 Bode G .061 .II0 .992 3.5 6.3 2.53 4.40 I C 0 20166 (1251) Bode BA .069 .169 .983 4.0 9.7 2.61 4.54 i C 0 20169 Bode N .066 .190 .980 3.9 ii .0 3.49 6.07 3 C 0 20179 .075 .199 .977 4.4 ii .5 8.54 14.84 4 f aMC 0 20183 .082 .132 .988 4.7 7.6 2.09 3.63 3 C 0 1.44 2.50 20194 .097 .143 .985 5.6 8.2 2.04 3.55 2 C 0 20195 .094 .157 .983 5.5 9.0 9.96 17.31 4f aMC 0 20201 .007 .211 .977 0.4 12.2 11.67 20.28 4f aMC 0 20209 Marco Polo P .003 .291 .957 0.2 16.9 18.04 31.36 4f C 0 20213 Marco Polo T .017 .235 .972 1.0 13.6 i .80 3.13 i C 0 20235 1202 Marco Polo A .033 .257 .966 2.0 14.9 3.99 6.94 i C 0 20236 1201 Marco Polo .034 .266 .963 2.0 15.4 15.94 27.71 4 C 0 12.33 21.43 20236A .036 .263 .964 2 .i 15.2 2.10 3.65 I C 0 20238 1203A Marco Polo G .032 .287 .957 1.9 16.7 2.98 5.18 2 C 0 2 Ref.