Central Bureau for Astronomical Telegrams
IAUC 5344: 1991 RB; P/GRIGG-SKJELLERUP
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Read IAUC 5345
Circular No. 5344
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
1991 RB
Further precise positions have been reported as follows:
1991 UT R.A. (1950) Decl. Observer
Sept. 8.58380 21 21 57.59 -65 51 08.5 McNaught
10.35627 20 49 17.51 -66 01 17.3 Gilmore
10.38370 20 48 43.59 -66 01 16.9 "
R. H. McNaught (Siding Spring). Uppsala Schmidt. Faint image.
A. C. Gilmore and P. M. Kilmartin (Mt. John Observatory).
Revised elements from observations on Sept. 4, 6.616, 8 and 10:
T = 1991 Nov. 9.278 ET Peri. = 68.418
e = 0.52448 Node = 358.536 1950.0
q = 0.73614 AU Incl. = 20.896
a = 1.54807 AU n = 0.511702 P = 1.93 years
1991 ET R.A. (1950) Decl. Delta r V
Sept.11 20 36.20 -65 57.1 0.163 1.082 17.3
16 18 42.93 -61 48.5
21 17 02.89 -48 46.7 0.111 0.997 17.4
26 15 56.31 -28 05.9
Oct. 1 15 13.43 - 7 27.2 0.118 0.917 20.2
PERIODIC COMET GRIGG-SKJELLERUP
S. Roeser, Astronomisches Rechen-Institut, Heidelberg, advises us
that he and U. Bastian are preparing a special star catalogue for use
in making observations of this comet in connection with the Giotto
encounter next year. The first part, consisting of an extract from
the PPM and Fokat catalogues (but using equinox B1950.0) with stars
extending 1 deg on each side of the comet's ephemeris during Nov.
1991-July 1992, will be available from the European Space Operations
Centre (ESOC), Robert-Bosch Strasse 5, W-6100 Darmstadt, Germany,
around Oct. 1. For the most critical time (1992 May 1 to early July)
some 1000 additional reference stars of mv about 12 within 15 arcmin
of the ephemeris are being selected from the GSC and AC in order to
give a density of 35 stars/deg**2. Positions of these stars will be
accurately observed with the Carlsberg Meridian Circle on La Palma
later this year. This part of the catalogue should be available
next March.
1991 September 12 (5344) Brian G. Marsden
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