Central Bureau for Astronomical Telegrams

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IAUC 7754: C/2001 W1; 2001eu, 2001fb, 2001fg, 2001fw,, 2001fx

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                                                  Circular No. 7754
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/2001 W1 (LINEAR)
     An object reported by LINEAR as apparently asteroidal but with
unusual motion (discovery observation below), and thus posted on
the NEO Confirmation Page, has been found to appear cometary by
other observers.  CCD images taken by J. Nomen (Barcelona, Spain,
0.40-m f/2 Schmidt telescope) on Nov. 18.15 UT show the object to
be slightly diffuse (m_1 = 18.0).  CCD observations obtained by T.
Spahr at the 1.2-m Mount Hopkins reflector on Nov. 18.33 show a
very diffuse coma of diameter about 7" and a very faint tail about
15" long in p.a. 200 deg.

     2001 UT             R.A. (2000) Decl.        m2
     Nov. 17.43013    7 48 03.10   +11 47 43.1   19.2

The available astrometry, together with the following preliminary
parabolic orbital elements and an ephemeris, appear on MPEC
2001-W27:

     T = 2001 Nov. 20.291 TT          Peri. = 353.322
                                      Node  =  92.440   2000.0
     q = 2.47064 AU                   Incl. = 117.311


SUPERNOVAE 2001eu, 2001fb, 2001fg, 2001fw, AND 2001fx
     A. V. Filippenko and R. Chornock, University of California at
Berkeley, write:  "Inspection of CCD spectra (range 400-1000 nm),
obtained on Nov. 18 UT with the Keck-II 10-m telescope, reveals
that SN 2001fb (IAUC 7740) is of type II, with well-developed P-Cyg
profiles for most lines; H-alpha emission, however, greatly
dominates over H-alpha absorption, which consists of both broad and
narrow components.  The redshift of the host galaxy is 0.0315,
measured from narrow nebular emission lines.  SN 2001fx in IC 5345
(IAUC 7751) is of type Ib, about a month past maximum brightness,
with strong He I lines having P-Cyg profiles; the redshift of the
host galaxy is 0.0266 (from nebular emission lines).  SN 2001fg
(IAUC 7744) is of type Ia, about 2 months past maximum brightness,
at a redshift 0.0311 (measured from narrow Na D absorption lines).
New spectra allow us to refine our uncertain classification of SN
2001fw (IAUC 7752) to type Ib, 1-2 weeks past maximum brightness.
Also, spectra obtained as above on Oct. 22 UT reveal that SN 2001eu
(IAUC 7731) is of type Ia, 2-3 months past maximum brightness, at a
redshift of 0.135 (from nebular emission lines)."

                      (C) Copyright 2001 CBAT
2001 November 19               (7754)            Daniel W. E. Green

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