Central Bureau for Astronomical Telegrams
IAUC 3979: SN IN NGC 991; PG 1550+191; 1984e; N Vul 1984
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Circular No. 3979
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
SUPERNOVA IN NGC 991
E. Waagen, AAVSO, communicates the discovery of a supernova
in NGC 991 by R. Evans, Maclean, N.S.W., and the confirmation by T.
Cragg, Anglo-Australian Observatory, by comparison to a Palomar Sky
Survey photograph. Confirmation is also reported by S. Dunbar from
two 10-min exposures by E. Helin, M. Barucci, and S. Swanson with
the Palomar 0.46-m Schmidt telescope on Aug. 28.5 UT. Dunbar notes
that the object is ~ 45-50" from the galaxy's center (R.A. = 2h33m2,
Decl. = -7deg22', equinox 1950.0) in p.a. 255 (slightly south of west).
Evans reported the supernova at mv = 14.0 on Aug. 28.8 UT and mv =
13.8 on Aug. 29.8.
PG 1550+191
I. M. Kopylov, Special Astrophysical Observatory, reports that
N. F. Vojkhanskaya observed this AM-Her-type object (cf. IAUC 3616)
during July 2-4 with the 6-m telescope at a dispersion of 60 A/mm.
The system had faded to mag 17, and the emission lines had practically
disappeared from the spectrum. Observations during June 6-8
had shown emission lines of moderate intensity.
PERIODIC COMET GIACOBINI-ZINNER (1984e)
J. T. Clarke, Marshall Space Flight Center, communicates the
following precise position, obtained by J. Brodie, P. McCarthy and
himself using the prime-focus CCD detector on the 4-m telescope at
Cerro Tololo Interamerican Observatory. The position was derived
from two images obtained roughly 1.5 hr apart, and similar images
were obtained the following night. The point-like images of the
comet were of essentially constant mv = 23. The position was
reduced using nearby AGK3 stars.
1984 UT R.A. (1950.0) Decl.
July 21.02708 13 57 31.6 + 4 43 48
NOVA VULPECULAE 1984
Further visual magnitude estimates: Aug. 23.95 UT, 8.3 (R.
Lebert, Tours, France); 25.15, 8.1 (J. DeYoung, Alexandria, VA);
26.10, 8.2 (DeYoung); 27.88, 8.5 (E. Schweitzer, Strasbourg,
France); 28.90, 7.9 (Schweitzer); 29.13, 7.5 (P. Maley, Houston,
TX); 29.91, 7.7 (Schweitzer); 30.83, 7.1 (Schweitzer).
1984 August 31 (3979) Daniel W. E. Green
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