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& Volume IV, Number 7 February, 1988 ISSN 0737-6766

P Newsletter is published by the International Occultation Timing Association. Editor and compos- itor: H. F. DaBo11; 6N106 White Oak Lane; St. Charles, IL 60175; U.S.A. Please send editorial matters, new and renewal memberships and subscriptions, back issue requests, address chancjes, araze prediction requests, reimbursement requests, special requests, and other IOTA business, but not observat"ion reports, to the above.

FROM THE PUBLISHER IOTA NEWS

For subscription purposes, this is the fi"st issue David IQ. Dunham of 1988. During February, my top priority will be completion If you wish, you may use your VISA or PasterCard for pdyuents to of the first draft of the article about the 1983 May MA; include account nwber, expiration date, and signature, Or m phone order to 31?,584-1162; If no answer, try 906,477-6957. 29th occultation of 1 Vulpeculae by (2) pa11as. I thank numerous readers who responded to my note on vm' p. 145 of the last issue. He are behind schedule on the Pallas work, but I am determined to have the IOTA meDership dues, including o.n. and any supplements first draft ready in time for the II meet- for U.S.A., Canada, and Mexico $15.00 ing on March 8 - 11 in Tucson, AZ, which I plan to for ail others to cover higher postal rates 20.00 attend. If possible, the first draft will be fin- o.n. subscriptionj (I · 4 issues) ished by the end of this month, so that it can be by surfdc mail mailed to the numerous co-authors so they can re- for U.S.A., Canada, and Mexico2 10.00 ceive it before March 8th. for al) others 9.84

' ~ by air (AO) mai13 for area "A'"j 11.56 After Pa11as, I will work on completion of analysis for area "g"5 -12.92 of other asteroidal with IOTA involve- for all other countries 14.28 ment. I had hoped to do a preliminary analysis of Back issues of o.n. by surface mall the 1987 January occultation by (471) Papagena ob- o.n. i (I) through q.n. 3 (13), each 1.00 served from the northeastern U.S.A. in time to in- o.n. 3 ()4) through o.n. 4 (I), each 1.75 clude a sky-plane plot with jim Stanm's sumary ar- cnn. 4 (2) and later issues, each 2.50 Back issues of o.n. by air (AO) mail ticle (see p. 159), but this was not possible. I o.n. i3 (I)(14) throughthrougho.n.o.n. 3 4 (Idl,, each 2.201.45 will need to complete most of these other analyses for my contribution for the Asteroids II book (I am o.n. 4 (2) and later issues 3.45 There are sixteen Issues per volunm a17 still available. a co-author with Robert Mi11is of a chapter on oc- cultations), due in late April. Although they are available to IOTA members without charge, non- members must pay fOr these 1tm: Local circtnstance (asteroidal appulse) predictions (entire cur- An obituary for James McMahon is reproduced from the rent list for your location) 1.00 newsletter of the China Lake Astronomical Society on \W Graze limit and profile prediction (each graze) 1.50 p. 169. His observations were crucial in initiating Papers explaining the use of the predictions 2.50 the debate about satellites of asteroids, and it is Asteroidal occultauon supplements will be ava11able at extra cost: a shame that more conclusive evidence for these ob- for South ^rica through [gnacfo Ferrin (Apartado 700; Merfda jects was not obtained while he was alive. I am SM-A; Venezuela), for Eumpe through Roland Boninsegna (Rue dc saddened to report another recent death. Vernon Mdriembourg, 33; 8-6381 DOURBES; Belgium), for southern Africa through M. D. Overbeek (Box 2]2; Edenvaie 1610; Republic of South Helms, who photoelectrically recorded the occulta- Africa), for Australia and New Zealand through Graham Blow (P.0. tion of 14 Piscium by (SI) Nemausa at the NASA·-Lang- Box 2241; Hellington, New Zealand), and for japan through Toshio Icy Research Center's observatory on 1983 September Hirose (1-13 Shimomaruko l-chome; Ota-ku, Tokyo 146, Japan). Sup- plements for all other areas will be available from JIm Slam 11th, passed away in October after a courageous 18- (Route 13, Box 109; London, KV 4074); U.S.A.) by surface mail at month battle against leukemia. the low price of ).18 or by air (AO) mail at ).96 canadian provincial boundary data. These were re- Observers from Europe and the British Isles should join 10TAJES, quested in the last issue. They have been provided sending DM 40.-- to the account IOTA/ES; Bartold-knaust Strasse 8; to me by Chuck Baker, Rockville, MD, but I will not 3000 Hannover 91; Postgiro Hannover 555 829 - 303; bank-code-number (Bankleitzah)) 250 )00 30. Full me±ership in IOTA/ES includes the have time to do the work needed to incorporate them supplement for European observers (total and grazing occultations). into the boundary database that I use, during the next few weeks. i Single issue at k of price shown 2 Price includes any supplements for North Amerfcan observers. 3 Not available for U.S.A., Canada, or Mexico Recent . Arnold Klemola measured existing ' Area "A" includes Central America, St. Pierre and Miquelon, Lick Observatory plates to refine the positions of Caribbean Islands, Bahamas, Bermuda, Colombia, and Venezuela. If Astrographic Catalog stars occulted by (58) Concord- desired, area "A" observers may order the North American supplement by surface mail at $).18, Dr by air (AO) mail at $1.50. ia on January 9th, and by (87) Sylvia on January 5 Area "B" includes the rest of South America, Mediterranean Afri- 21st and 25th. The 3 stars were considerably south ca, and Europe (except Estonia, Latvia, Lithuania, and U.S.S.R.). of their A.C. positions, moving the paths northward,

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well off the Earth's surface for the events on the pleton, VA, a short distance south of Petersburg; 9th and 25th. The shift for the 21St was 0':7 north, Richard Wilds (telephone 913,354-8771 in Topeka) putting the path across northern Africa, with enough plans to lead a group to (would you believe it?) uncertainty that an occultation was possible for Moonlight, KS, where the southern limit of and smjthern Europe. Joe Chums obtained plates at Cape the northern limit of Z.C. 555 intersect; Robert Observatory early on February, giving positions handy (phone 816,795-8116) plans to observe from which I used to calculate that the occultation by lewisburg, KS, since the graze path for Maia goes (241) Germania late on February 2nd would shift i':O ever the Kansas City Astronomy Club's observatory ±0':3 south, into the Antarctic Ocean well south of , there; and Harold Povenmire (phone 305,777-1303) lopes to observe the bright-limb graze of Taygeta any observers. Most of the shift was caused by er- (Z.C. 539) in Florida. ror in Germania's ephemeris. Based on the results of last March's passage, I made an error in the table on p. 143 of the last discussed in o.n. 4 (S), p. 100, no corrections issue; the shift for Z.C. 771 on Aug. 18 should be should be applied to the IOTA graze predictions as 0:'2 north. Harold Povenmire also reports that the defined by the ACLPPP predicted profiles, for these magnitude of Xl0832 = SAD 79256 is about 8.6, not waxing-phase events. Results from March seem to 7.5 as given in the catalogs. indicate that the Eichhorn catalog star positions used for the predictions now can be in As noted above, I need to concentrate on performing, error by 0':2, which is still at least as good as and writing about, occultation analyses dur- USNO'S new Zodiacal Zone (ZZ) catalog discussed on ing most of the next three months. This will leave p. 140 of the little time for star catalog work, which will further last issue. Incidentally, the ZZ includes stars delay completion of the new XZ catalog, and filling within 13° of the ecliptic, not 16°, as stated on numerous requests for it. Distribution of the next page 140. issue will be targeted for about June 1st. I intend to include information about the June 12th Pleiades Pleiades Chart. The apparent-place chart of the passage, which should provide interesting views for Pleiades, showing topocentric paths of the Moon's observers in the far western parts of North America. center for several cities, is similar to the charts Since time between this issue and the last has been in o.n. 4 (4), p. 61 and o.n. 4 (S), p. 99, and relatively short, Don Stockbauer will wait until the described on pages 59-61. A new Moon figure, sized next issue for his article on observed grazing occu1- properly for use with this chart, has been produced cations. [Ed: see p. 169 for some late IOTA news] with John hlestfa11's Moonview program using an Apple computer; see o.n. 4 (S), p. 92. The sunlit THE PLE1ADES PASSAGE OF FEBRUARY 23-24 limb is the more darkly drawn right side of the figure; most observable events will be David hi. Dunham disappearances on the dark side, which is lightly drawn (every other line skipped by the dot-matrix North Americans will be able to see a very favorable printer). During the February 23rd passage, the transit of the Moon across the P1eiades on Tuesday Moon's apparent radius will evening, February 23rd local time (24th U.T.). In- average 15:60. For orienting the Moon figure, the formation about this passage, including a chart position angle of the lunar north cusp will be 347" identifying the cluster stars by SAD numbers and and the center of the sunlit Iinb will be at 257°.

.A.— giving disappearance predictions for several U.S. ·e"8:="m""N-b and Canadian cities, has been published in this A?":""7=" ":. Q month's issue of Sky and Telescope. For more infor- / "" . .. '7 "u

mation about Pleiades passages in general, you I""",: Z';. I ' . '"""-·,-" ;" a should read o.n. 4 (4), pp.58-62, especially the t'"' W sections on value, predictions, observing considera- 90° · - 270° tions, detailed Pleiades chart using equinox 1950 "- ,, ,: . i.'{j!? ,.' , 2,9, ~

coordinates, and double stars. Pleiades passages .. 4,.R . . · occur each month, and a list of this year's passages "",- -··'- r"2u .tSf"- ,jOO O , i was published on p. 68 of last month's issue of Sky '·,,S'::'" ZZ "'? d" ° and Telescope. But o.n. readers can learn about "ll::~ 0 o' passages visible in their areas by examining the Al- cyone (Z.C. 552), Maia (Z.C. 541), and other bright S Pleiads' graze paths in the Grazing Occultation Sup- Comparison with the previous two charts shows that plement enclosed with this issue. the Moon is now passing much farther north across the cluster. The best views of all of this year's Grazing Occultation Expeditions. If you plan to passages will be from the arctic regions, where the lead an expedition to observe a grazing occultation Moon will pass farthest south across the cluster, during this passage, you can telephone me at 301, and closer to its center. North Americans were 585-0989 to give me approximate coordinates of where cheated this time, in that they got no favorable you plan to observe. If time permits, I will com- passage with the Moon passing centrally over the pute and mail you total occultation predictions for cluster. The most central passage for the continent the site; some information could be relayed by tele- occurred last December 4th, with the waxing Moon 99% phone. i would be interested in knowing about sunlit. planned expeditions, anyway, so that I can include this information in the IOTA occultation line mes- january 27th Passage Observed in Europe. Hans- sage at 301,495-9062; some Sky and Telescope readers Joachim Bode reported good conditions in Hannover, have already called in for expedition information. German Federal Republic, during the January 27th I am planning to lead an expedition to observe the passage. Several occultations were recorded photo- northern-limit graze of 5.6-mag. Z.C. 538 near Tem- electrically and with video equipment. The latter 159

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was used to record bright-limb reappearances of even are only in USNO'S P-catalog, should now be sent to 5th-mag. stars. Unfortunately, it rained at Hamburg, ILOC, as is the case for total occultations of non- north of Hannover and near the southern limit for the Pleiades stars. A copy of the report does not need graze of A1c.yone, and clouds also prevented observa- to be sent to me, although I am interested if the tion from Wiesbaden to the south. Hannover apparent.- observation gives more information about a star's 1y was in a lucky hole in cloud cover that may have duplicity, or if a novel observing method was used. blanketed much of Europe, as was the case for last ILOC now has a copy of the P-catalog (see p. 165), June's occultation of Spica. [Fd: also see p. 169] so they can reduce timings of stars in that catalog, whose code for the ILOC forms is "P" (not X, etc.). Reporting Observations of All Ploiades Occultations. A copy of reports of any graze observed should be All reports of total occultations observed during sent to Don Stockbauer; see p. ]41 of the last issue. Pleiades passages, including timings of stars that

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I have sumnarized all of the reports that I have re- Table 2. Observers & 1oc's reported Jan. - June °87. ceived for the first half of 19?,7 in the following "lb ust KAmE !jR$- NAM Z crtv |C0UNFRY &0Ub| No two tables, and section of notes. Table 1 lists all ,A,l ALLEN BILL jcmwcHLRcH Inew ZEALAND RA3KZ i I 2vents for which reports were received; the date, Aue AijuRzA ' MOISES ibafkjubimeto ivenezuela IJADA ; I , star, observer's identification let- An ANDEFSON PETER jcxjEEhsLAND RASNZ ; 6 ters (these are different from those used for 1986 K AFFENOCNDO E. 1BARCELCNA ISPAIN GEOS ; ¶ in some cases), and a reference to notes if there Ah ATHANASOV JAMES 1NCRTH PERTH jwEsTERN RASNZ i 1 Bt BAETEhS C. ;BOECFKjUT jBELGILAA G= ; 1 are any for that particular event. Table 2 lists 86 BAISE D. IBRUSSELS 1BELG1UK( GECJS : 1 all of the observers who sent in reports; their g BALL LINDSAY ;CXXPEF5 PLA6· jQUEEKSLANO RASNZ +: 1 + identification letters, last name, first name, near- Bh 8AKTHES J. :CASTRES . :FRANCE GECJS ' 6 est town to point of observation, country (for Morth By BENAVIDE?S ALFONSO ZARACAS %ENEZUELA UADA +: ¶ · + America and Australia, only the state or province is N BEKTOU O. ITCRinO Maly GEOS : 1 Be BLANCHAW C. !BR%ELS 4ELGLUM G= ! 3 7iven), organization through which the report came Bw BLOW GRAHAM IWEUJNGTCJN INEW ZEALAND RASNZ ! 4 (see above), and number of observations made in the Bn BOhKKSEGNA ROLAND IDCKJRBES IBELGUJU GECS i 2 (text continues on page 161) Bu BOUC|GE« J. ICINEY 1BELGIUM GEOS i 1 Bd BRANDT gustavO pmwjsmeto Ivenezuela ijada ; ¶ Bd BRETONES " PAULO "' ICAAAMNA3 IBRAZIL UADA i 1 Table I. Asteroidal events observed from January Bg BFUGI WCTOFI " jsANTE FE °° IARGENTJNA IJADA ! 1 through June 1987. Bd BIRDER H. °1ZCETERMEER 1netherlanos° GECB i 3 Bj BULLQN JM. IVALENCLA jspAIN i I "15a!e "'N;s¶Rmr"emLoc 8taA duemw"" note Bq BUSOUETS J. ITABERNES BL 1Spain GECS ; I An 2. 1h7 i6N~WTTHA +0T om !v~µrkmfKjFm Cn CAFPENTER Hj.T. jCRAYFCFID jLNITEDNNGDOM GECS i I jmn GO, ¶967 : 624imcroA 8 ®9'72 jFm Cb CASAS R ,?'&ADELL ?PA1N GEC8 ; 2 jan ¶0, ¶H7 ' 868:LWA 0* ~ :LjA4'nCk' Ch CHURMS JOE '" ;CAPE TOWN ;SOUTH AFFUCA ASSA : ¶ jm ¶1, ¶h7 m;BArmmNA o34" om 134 i a CNERA t. :VALENC1A :SPA1N GEOS : 2 jan ¶J, 1M7 64jNExN4oRA ¶03068 ., ,,,,,,, Ck CLAFU< MAURKIE 4RKLAOALE %ESTERN RASH : I jan ¶6, ¶H7 i ' q= om a CLETTE "° F. SBRUSSEL9 SBE°LCMUM ° ° GECS t ¶ jan 20. 1h7 : ¶36:alj6tfua BjhCX mm 1fm Gy CLUYSE L 4IELT CLGIUM GECS i 1 jan a ¶907 !6oI:NEKn«g m +W 1¶64 :0cAo C| WOhllBA A. 1reggkocalabfua Calv i 2 jm 34, 19'07 : BAC O68S66 j¶7 , 2Cm COME+ F. 1MATERO 4pain GEC8 i 1 IE..?!', 'W , »'(NWM AKJK3. nr 0066 ~0 3 Cp COOPER m |EA3T RAND 18OUTH AFRICA ASSA ! 7 JOn t!, 1h/ Jh¶emmnm flt m¶ Di Co CCFITESI S. :LUCERNE :9\MTZERLANO GECB i 1 "jan JO, ¶H7 : uEkerbth o428' 06U 0 0 0 0 g coUrbin ' f. ' Iverncn Ifrance gecb °; ¶ m I, ¶967 :WEn8 ¶0.' M¶. j8" Cl CWHILL ° ° LAIRD "" NEST BERLjN INEWJEJ'SEY AFIP i 1 ~ 2, ¶W7 ioo:An~N«B +01" mo :WEw (X DE FARLA CFIISTWAO J. 18ELO FKjFUCNTE IBRAZIL LIADA ! 1 m 6, ¶h7 :Qalj6qnla ·06' ¶4?9 1r~ ~ 12 ¶H7 : AKJ +2¶" ~ CvNmnEUY,p 0 . .. Ok GE KLERK J. ?cjTc>EsF'smajN( Isouth AFRICA ASSA i 3 ~ 13, ¶h7 i~kreu&a 8 ¶88102 j8hoMKjY Db DEL CASTILLO a. jvALENcIA 1spain gec6 ; ¶ Oh DELAHAYE F. jBoRDEAUx ;FRANCE GECJS i 2 ~ ¶j. ¶h7 : ¶1:pAxTFe©d'E ¶22 :cann 0 m 14, ¶h7 t4au6qna o00· 1416 jk0u Dq DECXJIQE R , ;VELAIHE jBELGIUM GEC6 ; 3 W ¶6. ¶H7 i¶9¢FCKTU4A " " jr m ° W 00CKIE ROSS ;GORE jNEw ZEALAND RASNZ ; 2 Fqb ¶7, IH7 i26 LBUB8A Kbk3b -DO' ¶849 Ion Ch DUNHAM DAVID ':EaB BFUHB\MCK :NEWjERSEY ARP : I ~ ¶7 m7 : zclutem o16" ion :Fm Eb EAFLE G. RAST RAND ° %OUTH AFFUCA ASSA +: 4 ~", m' i '0Q:wmm a jv om :6cHtm El EITTER °°' JOE Iakaes ° Kwa ° ARP : S ~ u, ¶907 :Mkatharha 4j r om 137 mM¶m8 4 ~ a ¶h7 : m;gm 8¢ 1698¶7 :nbg!R 6 EI ELLIOTT A iLEEDS !LNrrEDHNGcx»A GEQS ! f El ESMNCZA EDGAR ITAFUJA IBOLNIA IJADA 1 ¶ ~ n, 1H7 : 500·.1CLN4OA A~ O«" 0699 ~ 26. ¶h7 : m6iwRLga jr im Ev EVANS - GLEN IOXFCFD INEW ZEALAND RASN i I odu 3, ¶907 i¶o¶:HamA m ·m 1480 !8x Evy EJNALD D. 1BIESENTHAL IEAST GERMANY i 2 Fb FABREGAT J. IVALENCIA ISPAIN G= 1 ¶ Mm 6, ¶H7 q0:0Rlwa 0 090 0 ACbK3p 02r0 0604 :Bmcckmmhpmzm0 P 0 Mm 7, ¶H7 : - 1jcERU BAG ¶06847 N Fy FAVA UALBEKT ICUGNAUX IFRANCE GEC8 ; 1 Mm 7, ¶H7 !WMAJA 8^A 186392 :H~ Fo FEFUUN IGNACIO jkAERUjA !VENEZUELA UAOA i 1 omr 7, 1h7 :aTERcDHA 843 ¶62249 bw FI FLEET R " ;HARARE SOUTH AFFUCA ASSA i 1 Mw 8, ¶ H7 :W+N4ADNE ACjK3· o21" 0648 jf2 Qt~vw8 6 Fo FRASER B. IJCHANNESBURG 1SOUTH AFRICA ASSA i 2 Mar f¶, ¶H7 i BMJ ¶84291 :B¢VCh6f'O'Y Fm FREEMAN TCNY 1BERKELEY jcAIjFcRNIA ARP ; 7 Mm 12, 1H7 i 344:DE$|DERATA md o¶9" ¶247 !8CH Fu FUENTES RAFAEL j8AFKxjsIMETo jvENEzUELA UADA i 1 MW ¶3, ¶H7 : ~; u 2¶66609 Fn FUENTES RUBEN , j8AFwj6IMETo jvENEzUELA IJADA : 1 U ¶6, ¶H7 i 63ZHERCLLHA 8AC 0&2m :Ln a GABEL A. :MA!NZ · :WEST GERMANY GECB +: 1 ! ¶6, ¶967 : 6¶IjDAv¶DA BjC: ¶00626 :12 7 · * + 0 Go GALLO V. :SALERNO :1TALY GECJS : ¶ Wk a, 1H7 ! ¶%FcfrTUNA ·2v 0449 ;mt ~ . m X, ¶H7 i1WBBYLLA 8¢ 1 m6 :8cn a ©RCLA J. Iljsw , Ipcatugal GECB ! 2 Mw 26, ¶9C7 : 46fj PATW4TA ¶2.4 mn. jF" Gd GARDE T. :SHURUGWE :SOUTH AFRICA ASSA : 1 Mar 26, 1H7 ! m:HE~cjNE BA©: m 8 Ge GEORGE ANTHCNY ISALEM !OFEGON ARP ! ¶ ~ 20, m7 ' ¶«~aLA &AC: 1&6666 :~ Gq GECJRGE DOUG IOTTAWA Icntario ARP i 3 0 AfX 7. ¶h7 :l¶ipAFrrpe«jeE 8ac 078661 jLjFm G GEFIFUTSEN AA. IAMSTERDAM INETHERLANDS GEES i 1 W 7, ¶967 '07TWNJmA BAD K2039 ILf G6 GUEFUSSE J.-D. IBRUSSELS IBELGIUM GEOS i 3 Am 2, HC7 ;DO:ATHWANTB M3jC? o&" ¶222 :C1 eg GUERRERO JESO IBAFKXJBIMETO ;VENEZUELA IJADA ; I an 3. ¶H7 :4j2!PYTH[A SAC- ¶87631 !81 '0' ' jun ¶0. ¶h7 : 4urn«a kjk2- .fj" 09"3 ;~e~i ¶2 Gu GUESSE M. INOIJAKCHOTT 1MAUR(TANLA GEQS i 5 P PO ^n ¶7, ¶U7 i 8AC 1%73¶ :a N HARVEY D. °1MT. NEBO ;CXJEEFSLAND RASNZ i ¶ Fk HERS JAN ' ISEDGEFELD SOUTH AFRICA ASSA i 1 jun u. ¶H7 ' 8& mm !80 0 ^m '¶9. ¶H7 :66?1den6e ° AOdO- +W mi ;Cj'6": ...... 0 0 000000w~00wb00— N E'KEY ' DAVID IFIEDCI.FFE IQUEENLAND RASIQ ; 1 jun 21 ¶907 i46¶:patw4ta ¶25 m¶. :CPm He RCKEY TERRY iCABCjCLTWE 1(XEENHND RASNZ 1 ZLa 1087 :6&2jQLYMMA o20" 1617 |Mbcf6~f6m Eh HUTCHEQN STEVE jTcxIwooM8A jcjUEEKsLAND RASNZ i I

D 161

1

Table 2, continued. Table 2, concluded.

ID LAST NAME FIRST MAME crTY |Couwmv CJROUP No PR HUT(>EON STEVE SHELDON iQUEENLAhO RASNZ ; 7==mT=E.K !2"_ =r' LI IZAGW« JOSE IVENEZUELA LIADA i 1 80 8EPlhE P. 'LEDEN IhETFEAAhM GEM · 1 .h JO6T JAFN jMoLLN jvvEsT GERMANY GECB i I &¶n 3wr J. 1~~ j9OUMAFRCA A3SA ! 0 Kn KNGKT J. iEAST RAhO jsoUTKAFFUcA ASSA i 2 9¢ ~H CHARJE jOUEEKBLAhD RASLQ ! g Kl KN6GKT S. jEAsT RAhO jsoUMAFFUcA ABSA 1 ISo D. jBELGILM GEO8 i ¶ Kl a. Ikafiljaarxstd jEAsT ge'cb i 1 $& SPECOLASQLARE LJOGARNO 1lajceh'e 8WTTZEFLMD GEOS : 1 IQ KOHL M. ;LBTER Tftzeflmd i 2 Sp skelstra j. rrcFEmRQQM :gQUTH afnca ! 3 Kp KQPP u. :VELBEKT iwmGERwNY GEOS ; 2 Sc sum jim µntucky AFP ; , H alfred 4t.wavefu£y ,ycr~ rash : 1 &k STAMM J$AA :MAYSV1LLE :KENTUCKY ~ i I u {.ANET RAFAEL %araca3 Ivdezuela UADA t I 9k STOKER WAJFIICE ?AUCKLAND ' %CNZEALA1© RABQ : 1 Ln ;$AN BRUNO ~ t 2 » SWMON BFENT ZCEOARCTTY Rjtah ~ : I 4 lee ray Iwanganla Ikewzeawd mra ! ¶ Ty TAYLOR W. 1W~|ELD XHTEDIQNGDOM 1 Lo LEON !8ARQUmAETo !VENEZUELA IJAQA 1 ¶ Tt TKRONET Y. !BRLB$EL3 IBELGILM GEOS S Lv LEVAJ REhwro !SAO PAULO IBRAZIL IJADA i ¶ Th 8. Iwerv7k %ELMM Gm ! 2 Lh LFEUREUX A. IBELGIUM i 1 Tn s. iBoLmNA IfTALY ! 1 Lp UPSKJ P. IDFE3OEN iEAST GEmAANY i 1 n mjjiuo wcedono 1taaua iboln6a uada i g Lo LOADER BRAN 1CKRSTCHLRCH ihEIN ZEALAhO i 1 Tp TIMPANI F. iBOLjOGNA IITALY GRJA ! 1 Ly LYXNGA GFEG IALTADENA 1CALJFOFNA ARP i 2 Vb VAN p. iCAPE TOWN 13OUTHAFR£A ASSA i I Md WCOQUGAL CRAIG ITAMPA IFLDRDA @ i 1 Vd vNqaLHQQ4jYm-j. iBLcEMRoNmN 1$outhafmca assa i i % hAAKLY PETE iCENTRAL 1ARZONA ~ i I Vf VAN LOO F. iGENC jEAsT GEQ8 1 ¶ W MANY SLSAN jcENTRAL jARzoNA ARP i 1 in vulegas s&vina igUEm Nm 1ar3entna uada i ¶ b MANTILLA JAIRD ?ehda jvENEAjELA IJAOA i ¶ Vc VINCENT KUTH TELLJWTON jhEWZE'LMD RAS'Q 1 ' bh MARCH M. TTARO ?PA1N GEOS i ' Va ED ,,0UNCAN jQKLAHoUA ARP i 1 W UNWULL G. ;jCHANNESBURG ISOUTH AFFUCA ASSA ; ¶ vt VTTMATCHANKA ANA Du :TAR1jA ;BOLNX LLADA : ¶ Ml IAARTI J. :UATAFKj Tun : ¶ IM R ?JCHAN4ESBURG :SOUTH AFRCA A$SA : l^r MARTINEZ CLA~ %ueno8 A6RE3 ;AF1QENTHA UADA ? 1 \Ah ¶MmcFE HL Ieast GEFNWdY GEO6 : : Mx MARX H. 1$TUTTGAFW jwESTGERMANY i 2 Ym YAMMM KM4 WALTER ITAAUA :BOUV|A UADA : ¶ My WZALREY P. IVEFNON :FRANCE GEO8 1 Yv nEN TAK YEN !8ARQUBHAETD IVENEZXJELA (JADA ! 1 w mccullough robert lm RApm Iwchaan arp : i a ZALLES ROOCLFO ITARUA !Bajvu LLADA i ¶ w mcrae a ijoHAhNwjim %outh affkjl a3sa 1 ¶ Zm 3MWKAANN L iBRUS3EL8 IBELAILM GEO8 1 5 mo mengqu a Ibclqgna lmu.v gecb i 1 Z8 ZJSSELL RE ISOUTHHADLEY 1W$SIACHU8ETT$ ARP 1 ¶ W MCHE D. ijOHANESBURG ISOUTH AFRICA ASSA i I n n n iABASTLMANY ;SOVET GECB i ¶ W MIRALDA J. 1PERAFITA 1$PAIN C3BjS i I W OKLEAO KEBEFW ihERIDA Ivenezuela UAOA i 1 6 MCLJNA MALFIIQO 1CAFIACA$ 1VENEZUELA LIADA i 1 h bKX+U$BY a Ibulawayo Iscuth afhca assa i 4 period. The notes section indicates those reports We kmrRAbd k jTcjQNooMBA iouEEmAND rasnz i 1 where positive observations were made, 12 or more hAg MOYLAN a RASH i 1 observers participated, full reports published else- W MUKFOFD NOEL I=onno. jNEwzEALAho RASNZ i 1 Mi WJFPHY D- ITCCRMJKµABA ?UEEKBLAN0 RASIQ : ' where in o.n., or where other significant activity W OAjFPHY T. ; OCWDOMU ,QUEEHBLAND RASNZ : 1 was recorded. W MUFRAY TONY =ORGETO|NN :GEQRG1A ARP t 2 pt) NAPCKjTANO G, %. MARIA D. MCLE QTALY GECB i 1 The appropriate report form has been included for 1¶ NELSON PETER Mctocua RASNZ ! 1 you with this issue (except for ASSA). Use a copy Kb NOBEL W. Mader8erg INETHERLANDS GECB ! 2 00 ¢J8SERVAT(JRY PERTH IPEKTH 1WE$TEN RASNZ i ¶ of it when reporting your observations to IOTA. Qc QCJLFU JOSE R 1MEKOA IVENEZUELA 1JAD,A ; ¶ o qf11u cuum Ivekezuela LlACkA i 1 Notes: Events from january through June 1987, ref- Dv CNE«EK DANIE IEAST RMD ISOUTHAFRJCA ASSA i D erenced in Table 1. Pw PALZER W. 1\MESBADEN 1WEST GEFUAANY GEOS i I Po PAKNER L IGCFILJTZ 1EA$T GERMANY GEOS i 2 fk park jim mENwAvERLEY Ivctorla raskz i i I) Observers were BtBhBdBjl:qCsCiCfCyCmCrDhDsE1Fb Pr PAFIRA GUSTAVO jBAAQUwMETo jvENEzUELA LJADA i I GrGmGsGuMrMtt1yllbRvRuRoSnSeSaTyTtVfZmRz. Romijn PI PAFAA UJENA J. 1santmder ?pajn GECS i I reported a 3.2-sec. occ'iltation beginning at Pn PENA ALEXIS SBARoUwMEro ;VENEZUELA UADA : I 20:23:33.2, but it was tot confirmed by Serne, R PEFEZ PABLO ;BARQU1SNETO :VEKEZUELA (JADA : 1 Pc PIERCE ANDREW :NORTH PERTH IWESTEM4 RASH t I who was only 44 meters away. f4 mmi j. ?~ykanzsa Ihungary gec8 S i 2) Observers: CtM1ZsGeOnPmGhSyGgRKEtArGcGuMsNpPi. Pm rjterma jqnn §aL cnv 7pennsylvana arp ; 1 3) Pete and Susan Manly reported a blink at 10:34: Pd pfeoom c~ Lest haven :ajNNEcncur arp i 1 31, a l-sec. disappearance at )0:37:30, and a Pt KUESTLEY 4ukerua BAY &n ZEALAND RASNZ ! 2 k-sec. disappearance at 10:39:27.5. O QUINTANA CARUOSJ. 1caracas IVENEZUELA UADA i 1 Rf RAMON J. IVALENCLA 1SPAIN GEOS 1 ¶4) Observers for this event were SyVnLvMwV1RrFcMj Ap RASPAOCR G. IBOLOGNA ifTALY i I MeOcQnLaRmBvIzSzMmGpPnSjSdSrGjLeSgVuBaOtGfGxGb Ah RE«EFE G. IGRENOBLE 1FRANCE GEOS i 1 PrPzAzFuRnFn — 37 in all — a record since ! Fb RENOU A. IBRSSAC iFRANCE GEOS i 2 have been reporting these events! A 5:-sec. M RILEY PFULJP 1wEljjhGroN INEWZEALAhO RASNZ i 1 Av MIAS L BLA ISPAJN ! I disappearance was recorded by jose Izaquirre N FUZZO 1buenos AIFIE9 1argentna UADA i I and Domingo Sanchez from Puerto Ordaz, Venezue- N RD(»GUEZ WCTOR ;TEjERA IVENEZUELA LJADA : I la, beginning at 03:43:25. This indicates a W ROJAS jOSE 1tarua ?ouvia 1JADA ! I diameter of at least 20.4 km. Sanchez notes Clo JJ. ;LE1DEN ;NETHEFLA1©S GEOS : ¶ that the occultation took place 16 minutes Eh RCKDCN FFEDOY :8AFKjUBIMETO :VENEZUELA UADA +: ¶ Fh ROZENBAUM SAMI ?CARACAS %ENEZLELA 1JADA : ¶ later than Goffin's prediction. Ric RUOEP«O WCKAEL Iamhew IMASSACHUSETTS ARP t 1 5) A k-sec. blink was observed by Doug George at Sly SAAAQLYK G. !wEsr A= !WlSCOhSlN ARP i 3 about 08:18:01. Sd SANCHEZ DARMN :VENEZUELA LIAOA 1 ¶6) Observers were BsBnBdCoOqG1LhMxPwTtThZm. Palz- & SANCHEZ CJOWVGO 1VENEZLELA 1JAOA ; 1 er recorded three occultation events under a %1 SANCHEZ GILBERT IBARQUBSMETO IVENEZUELA 1.LADA i 1 S SANCHEZ &NNY iBARQUSMETO IVENEZUELA UADA i 1 clear sky. All were gradual — from 23:48:42 to Sr SANCHEZ RAFAEL IBARQUWMETO 'VENEZUELA 1JADA ' "i"" 23:48:50, from 23:56:28 to 23:56:38, and from 3f SCHAEFER BRAD ;CE~TCLCLO ICHLE IJADA : I 23:58:?? to 23:58:?? (about 4 sec.). Sb SCJ4EB D. ilLLFURTH Ifrance GEOS i 1 Sh SCKLLER D. IEAST RAND iSOUTH AFRCA ASSA i 3 Notes 7 and 8 were taken from reports received from Sn SCHNABEL C. jURcELcNA jspAIN GEOS i 4 Graham Blow, and published in CIRCULAR CQ 8712 (July _y

162

1987) of the Occultation Section of the Royal Astro- Observers farther south were: nomical Society of New Zealand. Alfred Kruijshoop Mt. Waverley, Victoria 15:31 to 15:49 DAVIDA- 87 MAR 16 Maurice Stoker Auckland, N.Z. 15:27 to 15:31 u^j Eil" """&kW" ""·: '> ""% ""% Ross Dickie Gore, N.Z. 15:25 to 15:44 =";uma·P " ' " ""&,,A<: 'm%,, ' %,, The observed occultation path coincides closely with paths predicted by Lowell. Graham is con- , ·. · "· O .G' cerned that the data from BBAO and Perth differ rjr"r ' ,) ""c'%%^ ' " "' .. y, '"-,. ..,,q" so much from that of Lowell, and he is working on the problem with Craig Bowers in Perth, and , others. A positive result of this occultation '".% 'La. ' however, was that it was able to show up sever- ·,4 C'j;,."· '<%% " . . al errors in the prediction routines used in "' .. . /'"i"".., "% . Wellington. These have been corrected, and now I the update paths agree very closely with those t:z" ">"\-it 17 "from the Lowell programs. 8) Geoff Douglas at BBAO obtained 4 consistent plates for this event, placing the path over southeastern Australia, as shown in Fig. 2. However, Bob Mi11is at Lowell obtained a plate which indicated a path over India. Graham Blow respected the consistency of the BBAO plates, 7) Edwin Goffin's original prediction placed this and notified a large number of observers, re- event across central New Zealand and the coast sulting in the largest turnout for an Austra- of Queensland, Australia. Perth Observatory lasian asteroidal event so far. obtained a plate on the 10th, and Black Birch Astrometric Observatory and Lowell Observatory each obtained plates on the 12th. The pa ths HERMIONE - 87 MAR 26 are shown in Fig. I. Graham Blow notified a '"m-l 'isl" 7:&""dy""'""""--- " "" number of observers in the affected area, and ":·'·r> L,, r> . · ,' 0 """' two positive records were obtained. Octal Is: "" """""<¥ ' 'L_r"':::!3 · " "'"A

p A % 0 Observer: Graham Blow at Carter Observatory in ,r"r < ,A "

Weill ngton "x.: i \ 41 ,9 : "' '· " O Longitude: 174° 46' Oi:'OS E ·....j>='b ..Ma, ,,(,) 4\"' ,y rj Latitude: 41° 17' 09':37 S Height: 129 meters Disappearance at 15:27:17.4 ± 0.1 "' ""E.. '%'zs(,) . '4'ai;)' .· . .. j

C Reappearance at 15:27:36.7 ± 0.1 ""f .. Observer: J. Priestley at Pukera Bay (30 km north of Wellington) ,,,'"":""'"'"""""'4'"" "SL°"' ":g)" Longi tude: 174° 53' 50!'9 E Lati tude: 4"° 01' 56!'6 S

Height: 6(' meters P Reappearance at 15:27:36.6 It is fortunate that this event was recorded at While the main event was not observed anywhere, all. In Wellington it was quite clear up until ~" about 20 minutes before the event, and again Perth Observatory did photoelectrica11y record about 40 minutes afterwards, but the clouds be- a strange drop of 0.25 magnitude at the time of came thicker and thicker as event time ap- the event. This is discussed later. Those who proached. The image was difficult to see on monitored from Australia were: the video s