Central Bureau for Astronomical Telegrams
IAUC 3829: 1983 LB; PLUTO AND 1978 P1
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Circular No. 3829
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
1983 LB
J. Gibson provides the following precise positions, obtained
by him with the 1.2-m Schmidt telescope at Palomar:
1983 UT R.A. (1950.0) Decl.
June 17.32578 16 22 20.65 -22 19 23.7
18.24663 16 20 05.86 -23 40 29.8
19.38480 16 17 12.67 -25 22 10.5
20.37161 16 14 40.72 -26 51 29.0
The following orbital elements, fitted to the eight available
observations, show the object to be of Amor type:
T = 1983 Aug. 1.918 ET
Peri. = 220.090 e = 0.48262
Node = 80.926 1950.0 a = 2.31006 AU
Incl. = 25.510 n = 0.280718
q = 1.19517 AU P = 3.51 years
1983 ET R.A. (1950.0) Decl. p r Mag.
June 23 16 07.73 -30 52.1 0.277 1.271 16.7
25 16 02.23 -33 56.6
27 15 56.58 -36 59.8 0.277 1.257 16.8
29 15 50.81 -40 00.0
July 1 15 44.93 -42 55.4 0.281 1.244 16.9
3 15 39.00 -45 44.7
5 15 33.03 -48 27.0 0.289 1.233 17.1
7 15 27.07 -51 01.4
9 15 21.15 -53 27.7 0.301 1.223 17.2
11 15 15.33 -55 45.6
13 15 09.63 -57 55.4 0.315 1.215 17.4
PLUTO AND 1978 P1
J. D. Mulholland and R. P. Binzel, University of Texas,
report that on the basis of photoelectric photometry during April-
June on the McDonald Observatory's 2.1-m and 0.9-m reflectors
there is yet no credible evidence that the Pluto system has entered
the expected eclipse series (Harrington and Christy 1981, A.J.
86, 442). These observations contradict the claims by Lyutyj and
Tarashchuk (1982, Sov. Astr. Lett. 8, 56).
1983 June 24 (3829) Brian G. Marsden
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