Central Bureau for Astronomical Telegrams
IAUC 4957: 1989c1; 1990D; 1989W
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Circular No. 4957
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
COMET AUSTIN (1989c1)
R. M. West, European Southern Observatory, communicates: "At the
instigation of T. Encrenaz, a 5-min CCD exposure in a broad R filter
(550-800 nm) was obtained with the ESO 3.5-m New Technology Telescope
during a spell of mediocre seeing (1".2) on Jan. 23.04774 UT by P.
Bouchet, J. Melnick, L. Pasquini and C. Gouiffes. The coma is
amorphous and is elongated in the antisolar direction (p.a. 92 deg).
Image processing with the radial renormalization technique by West
shows a rather bright, anticlockwise jet, emerging from the nucleus at
p.a. 275 deg, i.e., near the solar direction (p.a. 272 deg); the jet is
very narrow near the nucleus and broadens outwards. At p.a. 0 deg, the
center of the jet is at a distance of 6".5 (projected 9500 km) from the
nucleus; here the intensity is about 10 percent of the continuum value.
No ion tail is visible yet in this waveband and at this preperihelion
heliocentric distance (1.71 AU)."
Total visual magnitude estimates: Jan. 26.51 UT, 8.1 (G. Wolf,
Wellington, N.Z., 7 x 50 binoculars); 27.50, 8.0 (D. W. E. Green, off
the coast of Malaysia, 20 x 80 binoculars); 28.11, 8.7 (C. S. Morris,
Lockwood Valley, CA, 0.26-m reflector); 30.55, 7.9 (Green); 31.47, 8.1
(R. H. McNaught, Coonabarabran, N.S.W., 9 x 63 binoculars).
SUPERNOVA 1990D IN ANONYMOUS GALAXY
C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of a possible faint supernova in an anonymous galaxy at R.A. =
13h41m07s.77, Decl. = +29d21'41".4 (equinox 1950.0); the galaxy is of
compact aspect and at integrated magnitude Bj approximately 18.5. The
supernova appears at Bj = 20 on Jan. 23.2 UT and slightly brighter on
Jan. 31.2 UT on an unfiltered IIIa-J plate that includes an additional
contribution in U. The supernova is 6".4 east and 1".2 north of the
galaxy's nucleus. There are two fainter galaxies (mag 19) nearby at
end figures 07s.18, 41".5 and 06s.70, 50".6, and a star of Bj = 15.7 at
R.A. = 13h41m11s.4, Decl. = +29d20'55".2. The new object was not
visible to R = 19 on Jan. 3.2. The confirmation plate was obtained by
D. Albanese.
SUPERNOVA 1989W IN ANONYMOUS GALAXY
Pollas provides the following corrected position for the host
galaxy of supernova 1989W (cf. IAUC 4940): R.A. = 13h42m41s.34, Decl. =
+30d01'06".7 (equinox 1950.0). No supernova was visible to mag 21 on
Jan. 31.2 UT.
1990 February 1 (4957) Brian G. Marsden
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