THE ASTRONOMER Electronic Circular No 564 1991 Sept 21 14.30UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP, England. Telephone: (0256)471074 Int:+44256471074
Telex: 9312111261 Answerback: TA G JANET BOXES:
GMH at UK.AC.CAM.ASTRONOMY.STARLINK or GUYH at UK.AC.SUSSEX.CLUSTER
TELECOM GOLD: 10074:MIK2885 PRESTEL 256471074
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V635 CAS
Gary Poyner, Birmingham, reports that this optical component of an
x-ray source is again brightening (cf E514):
1991 Aug 4.00UT, 15.2; 9.06, 15.3; 12.04, 15.2; 18.01, 15.3; 18.99,
15.3; 20.05, 15.2; 30.97, 15.2; Sept 7.04, 14.9; 7.97, 15.1;
17.01, 14.8.
COMET SPACEWATCH (1991x)
J. V. Scotti, Lunar and Planetary Laboratory, has measured the
following positions of a comet discovered by T. Gehrels with the
0.91-m Spacewatch telescope on Kitt Peak. On the final image the
condensation is essentially stellar, and there is a tail extending
more than 5' in p.a. 258 deg.
1991 UT R.A. (1950) Decl. m2
Sept. 8.26146 23 14 25.94 - 8 45 13.0
8.28191 23 14 24.87 - 8 45 23.9 21.1
8.30510 23 14 23.57 - 8 45 35.2
8.32431 23 14 22.64 - 8 45 45.9
8.34513 23 14 21.49 - 8 45 56.9
8.36135 23 14 20.60 - 8 46 05.6 21.0
9.27110 23 13 33.30 - 8 54 03.4
9.27780 23 13 33.01 - 8 54 07.9 20.9
9.28718 23 13 32.52 - 8 54 13.1
IAUC 5341
P/COMET CHERNYKH (1991o) SPLIT
J. Luu, Harvard-Smithsonian Center for Astrophysics; and D.Jewitt,
Institute for Astronomy, University of Hawaii, communicate:
"We have discovered that P/Chernykh has split. Observations with
the 2.4-m telescope of the Michigan-Dartmouth-MIT Observatory on
Sept. 15 and 16 show that the secondary nucleus is separated from
the primary by 56".6 +/- 0".7 in p.a. 71 +/- 1 deg. Both primary
and secondary objects appear extended. The Mould R magnitudes of
the primary and secondary are 16.1 and 19.1, respectively, measured
within an 11".7-diameter diaphragm. Neither the separation nor the
difference in magnitudes changed between nights."
IAUC 5347
SATELLITES OF SATURN AND NEPTUNE
The IAU Executive Committee has approved the following new
designations and names:
Saturn XVIII Pan = 1981 S13
Neptune III Naiad = 1989 N6
Neptune IV Thalassa = 1989 N5
Neptune V Despina = 1989 N3
Neptune VI Galatea = 1989 N4
Neptune VII Larissa = 1989 N2
Neptune VIII Proteus = 1989 N1
The satellites of Neptune are numbered in order of increasing
distance from the primary.
IAUC 5347
Guy M Hurst