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IAUC 8211: C/2003 S3; 2003gq, 2003hf, 2003hp, 2003ht, 2003hw, 2003ig

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                                                  Circular No. 8211
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 S3 (LINEAR)
     M. Bezpalko, Lincoln Laboratory, Massachusetts Institute of
Technology, reports the LINEAR discovery of a comet, their Sept. 27
images showing a tail in p.a. 260 deg (discovery observation below).
Following web-posting on the NEO Confirmation Page, J. Young
reported that CCD images taken with the 0.6-m reflector at Table
Mountain on Sept. 28.4 and 29.4 UT reveal a 5" coma and a straight,
narrow tail 20" long in p.a. 65 deg and 57 deg, respectively.

     2003 UT             R.A. (2000) Decl.       Mag.
     Sept.27.37818    4 11 01.82   +28 54 42.2   20.1

The available astrometry, the following very preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2003-S85.

     T = 2003 Sept.19.814 TT          Peri. = 164.242
                                      Node  = 226.322   2000.0
     q = 8.16889 AU                   Incl. = 151.586


SUPERNOVAE 2003gq, 2003hf, 2003hp, 2003ht, 2003hw, 2003ig
     A. V. Filippenko and R. Chornock, University of California,
Berkeley, report that inspection of CCD spectra (range 320-920 nm),
obtained on Sept. 28 UT with the Keck-I 10-m telescope, reveals
that SN 2003hf (IAUC 8182) is indeed of type II, as suggested on
IAUC 8189; very strong, broad H_alpha emission is present, with
essentially no absorption, but other features have P-Cyg profiles.
Based on the available spectra, which closely resemble those of SN
1979C (Branch et al. 1981, Ap.J. 244, 780), it is likely that
analysis of the light curve will show that the object is
specifically of type II-L.  SN 2003hp (IAUC 8188, 8189) is a
1998bw-like type-Ic supernova (see Foley et al. 2003, PASP 115,
1220, and references therein), roughly 1 month past maximum
brightness.  SN 2003ht (IAUC 8192) is of type II, in the nebular
phase.  SN 2003hw (IAUC 8198) is of type Ia, about 2 months past
maximum brightness.  SN 2003ig (IAUC 8207) is of type Ic, within a
week past maximum brightness.  SN 2003gq (IAUC 8168), whose early-
time spectrum (IAUC 8170) resembled that of SN 1991T but with low
ejection velocities, continues to exhibit a spectrum very similar
to that of SN 2002cx (Li et al. 2003, PASP 115, 453), characterized
by unusually narrow lines.

                      (C) Copyright 2003 CBAT
2003 September 29              (8211)            Daniel W. E. Green

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