Central Bureau for Astronomical Telegrams
IAUC 5315: Prob. N IN Sgr; P/GRIGG-SKJELLERUP; FG Ser; V482 Cyg
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Read IAUC 5316
Circular No. 5315
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
PROBABLE NOVA IN SAGITTARIUS
The following position was measured by P. M. Kilmartin from
films taken by A. C. Gilmore with the 0.6-m f/14 Cassegrain telescope
at Mount John University Observatory on July 30.4 UT: R.A. =
18h10m58s.12 +/- 0s.10, Decl. = -32 13'23".6 +/- 0".2 (equinox
1950.0).
Further visual observations (cf. IAUC 5313): July 30.37 UT,
8.1 (A. F. Jones, Nelson, New Zealand); 30.45, 8.5 (P. Wiliams,
Heathcote, New South Wales); 30.46, 8.2 (Jones); 30.46, 8.6 (T. B.
Tregaskis, Mt. Eliza, Victoria); 31.090, 8.4 (J. E. Bortle,
Stormville, NY).
PERIODIC COMET GRIGG-SKJELLERUP
T. Morley and H. Bohnhardt, European Space Operations Centre,
write: "The European Space Agency has approved the mission known as
Giotto Extended Mission (GEM) for a spacecraft encounter with
P/Grigg-Skjellerup on 1992 July 10. High-quality astrometry of the
comet is needed at ESOC to determine the most accurate cometary orbit
possible for the flyby. Since there will be no 'Pathfinder Project'
using observations of other cometary missions, the importance
of ground-based astrometry for orbit improvement is even higher than
during the P/Halley campaign. We would appreciate receiving high-
quality astrometric data of P/Grigg-Skjellerup within two days of
observation; astrometry will be of highest priority during the two
months prior to encounter. We can be reached at ESOC/ECD/OAD,
Robert-Bosch-Str. 5, D-6100 Darmstadt, Germany; e-mail TMORLEY@ESOC.
BITNET or HBOEHNHA@ESOC.BITNET."
FG SERPENTIS
Photometry by Gilmore (cf. IAUC 5311): July 28.49 UT, V =
11.95 +/- 0.03, B-V = +1.74 +/- 0.03, V-R = +1.57 +/- 0.04.
V482 CYGNI
Visual magnitude estimates (cf. IAUC 5101): 1990 Sept. 28.90
UT, 14.3 (P. Schmeer, Bischmisheim, Germany); 1991 Jan. 4.74, 13.6
(Schmeer); Mar. 14.16, 13.6 (A. Boattini, Florence, Italy); Apr.
14.14, 12.4 (M. Verdenet, Bourbon-Lancy, France); May 18.93, 11.8
(Verdenet); July 2.96, 11.9 (S. Korth, Dusseldorf, Germany).
1991 July 31 (5315) Daniel W. E. Green
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