Central Bureau for Astronomical Telegrams
IAUC 7851: C/2002 C1; 2002bn; 2002bo; 2002bl; 2002bq
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Circular No. 7851
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
COMET C/2002 C1 (IKEYA-ZHANG)
M. Fujii, Fujii Bisei Observatory (FBO); K. Ayani, Bisei
Astronomical Observatory (BAO); and H. Kawakita, Gunma Astronomical
Observatory, report that low-resolution spectra of comet C/2002 C1
obtained with the FBO 0.28-m reflector on Mar. 3.41 UT show the
Na I emission line at 589.3 nm. Confirming spectroscopy at higher
resolution (0.05 nm) with the BAO 1.01-m reflector on Mar. 6.41
resolved the Na I D_1 and D_2 emission lines. The stronger D_2
line has an equivalent width of 0.5 nm and is blueshifted by -33
km/s, which is consistent with the geocentric velocity of the comet.
SUPERNOVA 2002bn IN UGC 6527
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2002bn (cf. IAUC 7846), obtained by V. Hradecky
on Mar. 9.28 UT with the F. L. Whipple Observatory 1.5-m telescope
(+ FAST spectrograph), shows it to be a type-Ia supernova, four
weeks after maximum.
SUPERNOVA 2002bo IN NGC 3190
R. Chornock, W. D. Li, and A. V. Filippenko, University of
California, Berkeley, report that inspection of CCD spectra (range
330-1000 nm) obtained on Mar. 11 UT with the Shane 3-m reflector at
Lick Observatory reveals that SN 2002bo is a supernova of type Ia.
The Si II absorption near 585 nm is unusually strong, perhaps
implying that the supernova is somewhat underluminous. However, the
spectrum lacks the strong Ti II features typical of SN 1991bg-like
objects (Filippenko et al. 1992, A.J. 104, 1543). The expansion
speed of the ejecta, measured from the minimum in the Si II
635.5-nm trough, is about 16 000 km/s; such a high value suggests
that the object is quite young.
SUPERNOVA 2002bl IN UGC 5499
D. Rich, Hampden, ME, reports a prediscovery observation of SN
2002bl (cf. IAUC 7845) at mag about 17.8 in an unfiltered CCD image
taken with a 0.26-m telescope on Feb. 12.21 UT.
SUPERNOVA 2002bq IN MCG -06-21-10
On IAUC 7848, the MCG number was given incorrectly.
(C) Copyright 2002 CBAT
2002 March 12 (7851) Daniel W. E. Green
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