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Occdtalion3newstetter ¢. " j. .. ¢ Occdtalion3Newstetter % & Volume IV, Number 7 February, 1988 ISSN 0737-6766 P Occultation 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 Asteroids 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 year · 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 occultations 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 Astrometry. 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, 157 r & 158 ¶mp 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 Maia 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 Pleiades 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, asteroid 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).
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