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IAUC 8098: C/2003 F1; 2003bn, 2003bu, 2003cb, 2003ch,, 2003ci

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                                                  Circular No. 8098
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/2003 F1 (LINEAR)
     An apparently asteroidal object reported by the LINEAR project
(discovery observation below), and posted on the NEO Confirmation
Page, has been found to have cometary appearance by numerous CCD
observers on Mar. 24-25 (who have reported diffuseness, a coma
diameter of up to 10", and a tail of length 7"-40" in p.a. 300-330
deg), including A. R. Apitzsch (Wildberg, Germany); S. Sanchez, R.
Stoss, and J. Nomen (Mallorca, Spain); M. Froehlich (Essen,
Germany); G. Hug (Eskridge, KS; m_1 = 16.7); J. E. Arlot
(Observatoire de Haute Provence); H. Mikuz (Crni Vrh, Slovenia);
and L. Buzzi (Varese, Italy; m_1 = 17.7).  Available astrometry,
very preliminary parabolic orbital elements (q = 3.9 AU, T = 2002
July 31), and an ephemeris appear on MPEC 2003-F35.

     2003 UT             R.A. (2000) Decl.        m2
     Mar. 23.43063   17 23 30.78   +51 22 52.1   18.2


SUPERNOVAE 2003bn, 2003bu, 2003cb, 2003ch, AND 2003ci
     M. Salvo and B. Schmidt, Research School of Astronomy and
Astrophysics, Australian National University (ANU); and J. Tonry,
Institute for Astronomy, University of Hawaii, report that a
spectrum (range 350-900 nm) of SN 2003bn (cf. IAUC 8088), obtained
on Mar. 24.48 UT with the ANU 2.3-m telescope (+ DBS spectrograph),
shows it to be a type-II supernova, approximately 1 month past
explosion.  The redshift of the host galaxy is cz = 3800 km/s as
determined from narrow H_alpha at the position of the supernova.
Weak iron lines in the supernova spectrum indicate a photospheric
velocity of 5400 km/s.  A spectrum of SN 2003bu (cf. IAUC 8092),
obtained on Mar. 24.68, shows it to be a type-Ic supernova; cross
correlation with a library of type-Ic supernovae spectra indicates
that SN 2003bu is approximately 1 week past maximum light.  A
spectrum of SN 2003cb (cf. IAUC 8088), obtained on Mar. 24.64,
shows it to be a type-II supernova, approximately 2 months after
explosion; weak lines in the supernova spectrum indicate a
photospheric velocity of 3000 km/s.  A spectrum of SN 2003ch (cf.
IAUC 8097), obtained on Mar. 24.45, shows it to be a type-Ia
supernova.  Cross correlation with a library of type-Ia supernovae
spectra indicates that SN 2003ch is approximately 3 +/- 2 days
before maximum light, and at a redshift of z = 0.025.  A spectrum
of SN 2003ci (cf. IAUC 8097), obtained on Mar. 25.52, shows it to
be a type-II supernova, approximately 3 weeks past explosion; weak
iron lines in the spectrum indicate a photospheric velocity of 6500
km/s.

                      (C) Copyright 2003 CBAT
2003 March 25                  (8098)            Daniel W. E. Green

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