Central Bureau for Astronomical Telegrams
IAUC 8631: 2005ke; C/2005 W1
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 8632
.dvi,
.ps or
.PDF format.
Circular No. 8631
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)
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
Read IAUC 8632
.dvi,
.ps or
.PDF format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
