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IAUC 8631: 2005ke; C/2005 W1

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IAUC number

                                                  Circular No. 8631
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2005ke IN NGC 1371
     F. Patat and D. Baade, European Southern Observatory (ESO); L.
Wang, Lawrence Berkeley Laboratory; S. Taubenberger, Max-Planck-
Institut fuer Astrophysik, Garching; and J. C. Wheeler, University
of Texas, report on observations of SN 2005ke (cf. IAUC 8630, CBET
289) on Nov. 16.12 UT with ESO's Very Large Telescope (+ FORS1 in
polarimetric mode).  A fully reduced spectrum (range 340-855 nm,
resolution 1.3 nm FWHM) shows 2005ke to be an underluminous type-Ia
supernova before maximum, showing the characteristic 420-nm Ti II
and 635-nm Si II lines.  The spectral appearance is very similar to
that of SN 1999by at 4 days before maximum light (Garnavich et al.
2004, Ap.J. 613, 1120).  The expansion velocities deduced from the
absorption minima of Si II, Ca II and O I are all around 11400 km/s
-- with the exception of Ca II H and K, from which a velocity of
13300 km/s is deduced.  The synthetic colors derived from the
spectrum are B-V = +0.33 and V-R = +0.24.  A preliminary reduction
of the spectropolarimetric data indicates a polarization degree of
several percent in the Ca II infrared triplet.  SN 2005ke was re-
observed on Nov. 17.11 with the same instrumentation; the
velocities have decreased by about 400 km/s, the color became
slightly redder (B-V = +0.45), and the polarization degree reduced
by a factor of two.  An earlier inspection of preliminarily reduced
data led to the incorrect classification this object as a type-Ib/c
supernova (cf. CBET 291).

COMET C/2005 W1 (SOHO)
     Further to IAUC 8626, K. Battams has reported measurements
(initial position given below) for a Marsden-group comet that was
typically stellar but brightened significantly from mag nearly 9
when first detected in C3 images to about 5.7 in C2 images.  B. G.
Marsden remarks on MPEC 2005-W07 (where he presents both parabolic
and elliptical orbital elements for the currently visible comet)
that this object is probably identical with C/2000 C4 (IAUC 7832,
MPEC 2000-C52, MPC 44860), though it is conceivably identical with
C/2000 C3 or C/2000 C7 (which both appeared around the same time --
and, if they still exist, are also presumably about to return).

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 W1   Nov. 16.579  15 32.2   -20 31   C2/3  HS   2005-W07

                      (C) Copyright 2005 CBAT
2005 November 18               (8631)            Daniel W. E. Green

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