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IAUC 7580: 2001S; V445 Pup; C/2001 C2

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IAUC number 

                                                  Circular No. 7580
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 2001S IN UGC 5491
     T. Puckett, Mountain Town, GA; and A. Sehgal, Woodinville, WA,
report the discovery of an apparent supernova (mag 17.8) on an
unfiltered CCD frame (limiting mag 20.1) taken with the Puckett
Observatory 0.60-m automated supernova patrol telescope on Feb.
6.26 UT.  SN 2001S is located at R.a. = 10h11m57s.20, Decl. =
+58o52'02".9 (equinox 2000.0), which is 7".7 west and 10".0 north
of the center of UGC 5491.  The new object was confirmed on CCD
frames taken on Feb. 7.01.  SN 2001S does not appear on Palomar Sky
Survey images taken on 1996 Dec. 20 (limiting mag about 21.0), 1997
May 6 (limiting mag about 21.1) and 1954 Jan. 5 (limiting mag about
19.5).


V445 PUPPIS
     R. W. Russell, D. K. Lynch, and D. Kim, The Aerospace
Corporation; and M. L. Sitko and S. M. Brafford, University of
Cincinnati, report on infrared spectroscopy of V445 Pup on Jan.
31.45 UT using BASS on the Infrared Telescope Facility:  "The
spectrum (in radiance units W cm**-2 micron**-1) revealed only a
smooth, featureless continuum that decreased monotonically with
increasing wavelengths (lambda) between 3 and 13.6 microns.  Its
slope is much more shallow than the Rayleigh-Jeans tail of a hot
blackbody, close to lambda**-1.5.  The spectrum is consistent with
thermal emission from gray-emissivity dust whose temperatures
ranged from about 250 K to upwards of 1000 K.  Infrared magnitudes
were L = 2.63, M = 1.78, N = -0.16 (all +/- 0.05).  The presence of
such a strong infrared excess so early in the object's evolution
suggests that this object is a recurrent nova and has undergone
previous outbursts and dust-formation events."


COMET C/2001 C2 (SOHO)
     Further to IAUC 7573, D. A. Biesecker reports his measurements
of a fairly bright Kreutz sungrazing comet found by S. Hoenig and
X.-m. Zhou on C3 coronagraph images posted at the SOHO website.  V
magnitude estimates by Biesecker:  Feb. 6.654 UT, 7.6; 6.696, 7.5;
6.738, 7.1; 6.779, 6.7; 6.821, 6.7; 6.863, 6.4; 6.904, 6.0; 7.013,
5.7; 7.154, 5.2; 7.221, 4.9; 7.263, 4.5; 7.321, 4.5; 7.488, 4.0.
Estimated tail lengths:  Feb. 6.904, 0.1 deg; 7.488, about 0.2 deg.
The reduced positions and orbital elements by B. G. Marsden appear
on MPEC 2001-C09.

     2001 UT           R.A. (2000) Decl.
     Feb.  6.346      21 52.5      -18 07

                      (C) Copyright 2001 CBAT
2001 February 7                (7580)            Daniel W. E. Green

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