Central Bureau for Astronomical Telegrams
IAUC 4203: Occns BY PLUTO; 1986 DA; 1982i
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Circular No. 4203
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 617-495-7244/7440/7444
OCCULTATIONS BY PLUTO
D. Mink, Center for Astrophysics, has updated the published
predictions (Mink and Klemola 1985, A.J. 90, 1894) on the basis of
measurements by A. Klemola and E. Harlan, Lick Observatory, of two
new plates. Times are still uncertain by +/- 10 min. The occultation
P4 should occur on 1986 Apr. 30d12h00m UT and be visible from
Hawaii, Japan and the coast of China with a maximum duration of 2
min (assuming a radius of 1500 km for Pluto). The occultation P5
should occur on 1986 June 22d01h35m UT and be visible from South
America with a maximum duration of 4 min.
1986 DA
Ephemeris continuation from the orbital elements on MPC 10545:
1986 ET R.A. (1950.0) Decl. p r V
Apr. 30 12 38.09 + 9 01.7 0.225 1.197 14.3
May 5 12 54.08 + 5 00.9
10 13 09.21 + 1 13.2 0.255 1.230 14.6
15 13 23.46 - 2 16.2
20 13 36.86 - 5 24.7 0.301 1.273 15.0
25 13 49.47 - 8 11.7
30 14 01.36 -10 38.0 0.361 1.324 15.5
June 4 14 12.64 -12 45.6
9 14 23.41 -14 36.7 0.436 1.381 16.0
19 14 43.89 -17 38.1 0.524 1.444 16.5
29 15 03.38 -19 57.2
July 9 15 22.28 -21 45.3 0.739 1.581 17.5
19 15 40.95 -23 10.7
29 15 59.52 -24 18.5 1.002 1.726 18.4
PERIODIC COMET HALLEY (1982i)
Total naked-eye magnitude estimates: Apr. 2.00 UT, 2.8 (J.-C.
Merlin, Sao Francisco de Oliveira, Brazil; tail 4 deg in p.a. 270 deg);
3.17, 2.9 (G. Keitch, Tenerife, Canaries; tail 5 deg in p.a. 294 deg);
5.66, 3.2 (D. W. E. Green, Bowen Mountain, N.S.W.; tail ~ 4 deg);
7.07, 2.4 (Merlin); 8.52, 2.8 (Green, North Head, N.S.W.); 10.87,
2.7 (M. Cavagna, Praslin, Seychelles; tails 3.2 deg in p.a. 335, 1.3 deg
in p.a. 0); 12.68, 3.7 (K. Muraoka, Geisei, Japan).
1986 April 16 (4203) Brian G. Marsden
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