Central Bureau for Astronomical Telegrams
IAUC 5552: 1992ad; N Cyg 1992; N Pup 1991
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Circular No. 5552
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1992ad IN NGC 4411B
R. H. McNaught, Anglo-Australian Observatory, reports the
discovery on July 1.37 UT by R. Evans, Hazelbrook, N.S.W., of a
supernova of mv = 13.5 located about 40" east and 40" south of the
center of NGC 4411B (R.A. = 12h24m.25, Decl. = +9 09'.7, equinox
1950.0). Evans noted the supernova's brightness as unchanged on
July 2.4. McNaught provides the following measurement of the
supernova's position: R.A. = 12h24m17s.04, Decl. = +9 09'14".2,
uncertainty 0".4 in each coordinate). A nearby star of mag 13.0, on
the opposite (northwest) side of the galaxy, has end figures 10s.24,
10'24".4. The galaxy is a face-on spiral of low surface brightness
and does not appear on the short exposure taken with the Uppsala
Southern Schmidt telescope on July 2.36. However, offsets for the
supernova relative to the coordinates of the nucleus in the Hubble
Guide Star Catalogue are 34".6 east, 26".2 south. Nothing appears
in this position on the first Palomar Sky Survey or in the NASA
Atlas of Galaxies.
J. Spyromilio, Anglo-Australian Observatory, communicates:
"Spectrograms (range 380-670 nm, resolution 1000) of SN 1992ad were
obtained at the Anglo-Australian Telescope on July 2 by K. Taylor
(AAO), M. Hawkins (Royal Observatory, Edinburgh), and P. Vernon
(Observatoire de Haute Provence). The spectrum exhibits hydrogen
Balmer lines with characteristic P-Cyg line profiles, indicating a
type-II supernova."
NOVA CYGNI 1992
Further photometry of Nova Cyg 1992 (cf. IAUC 5537) obtained
at the N. Copernicus Observatory and Planetarium in Brno,
Czechoslovakia, by D. Hanzl and E. Neureiterova (comparison star HD
195664; uncertainty +/- 0.03 unless otherwise noted): June 16.926
UT, V = 9.10 +/- 0.05, B-V = -0.56 +/- 0.05, U-B = -0.72 +/- 0.06;
17.969, 9.09, -0.57, -0.70; 20.947, 9.16, -0.56 +/- 0.05, -0.70 +/-
0.05; 25.888, 9.21, -0.59, -0.70 +/- 0.04; 27.874, 9.29 +/- 0.02,
-0.59, -0.68 +/- 0.04; 28.916, 9.31 +/- 0.02, -0.62 +/- 0.02, -0.69.
NOVA PUPPIS 1991
Further photometry by A. C. Gilmore, Mt. John University
Observatory (cf. IAUC 5538): June 19.39 UT, V = 11.62 +/- 0.05, B-V
= -0.06 +/- 0.02, U-B = -0.85 +/- 0.09, V-R = +0.99 +/- 0.03
(object low in the sky).
1992 July 2 (5552) Daniel W. E. Green
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