Central Bureau for Astronomical Telegrams
IAUC 6351: 1996N; 1996B; 29P
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Circular No. 6351
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 1996N IN NGC 1398
A. Williams and R. Martin, Perth Observatory, report their
discovery, during the Perth Astronomy Research Group's automated
supernova search on the Perth-Lowell 0.61-m reflector, of a
supernova (R about 16) on Mar. 12.538 UT. SN 1996N is located 46"
east and 12" north of the center of NGC 1398 (R.A. = 3h38m.9, Decl.
= -26o20', equinox 2000.0). Nothing was visible at this location
on Feb. 16.
L. Germany and B. Schmidt, Mount Stromlo and Siding Spring
Observatories; and R. Stathakis and H. Johnston, Anglo-Australian
Observatory, report that a spectrogram (range 550-900 nm) obtained
on Mar. 23.4 UT at the Anglo-Australian Telescope shows SN 1996N to
be a type-Ib/c supernova, about 2 weeks past maximum.
SUPERNOVA 1996B IN NGC 4357
L. Wang and J. C. Wheeler, University of Texas at Austin,
report: "SN 1996B was observed again using the Imaging Grism
Instrument at the 2.1 m telescope of the McDonald Observatory on
Mar. 20 UT. Inspection of a preliminarily-reduced CCD spectrum
(range 424.7-813.5 nm, resolution 2.0 nm) shows that the H-alpha
feature that was strong in our Jan. 22 spectrum (IAUC 6292) has now
decreased in strength sharply. The residual H-alpha feature is
flat-topped (with FWHM about 10~000 km/s) and resembles that of SN
1993J in its late nebular phase. A weak absorption feature is
still detectable at the blue side of the flat-topped H-alpha
emission feature. There are also indications of the existence of
the various helium lines that were detected in SN 1993J, but the
spectrum is too noisy to establish this firmly. The redshift of
the host galaxy, as measured from the neighboring H II region, is
4440 km/s. SN 1996B is therefore likely to be another type-IIb
supernova similar to SN 1993J. Observations in other wavelengths
are encouraged."
COMET 29P/SCHWASSMANN-WACHMANN 1
Further total visual magnitude estimates (cf. IAUC 6320):
Feb. 24.39 UT, 11.2 (C. S. Morris, Lockwood Valley, CA, 0.26-m
reflector); Mar. 8.85, 11.1 (K. Hornoch, Lelekovice, Czech
Republic, 0.35-m reflector); 13.29, 10.8 (R. Keen, Mt. Thorodin,
CO, 0.32-m reflector); 17.25, 10.9 (Morris); 23.19, 11.3 (A. Hale,
Cloudcroft, NM, 0.41-m reflector).
(C) Copyright 1996 CBAT
1996 March 23 (6351) Daniel W. E. Green
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