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IAUC 8491: 2005am, 2005an; C/2005 E1

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IAUC number

                                                  Circular No. 8491
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)

SUPERNOVAE 2005am AND 2005an
     Further to IAUC 8484, K. Shimasaki and W. Li report the LOSS
discovery of an apparent supernova on an unfiltered KAIT image
taken on Mar. 3.35 UT (mag 17.3).  SN 2005an is located at R.A. =
12h28m27s.35, Decl. = -24o38'02".4 (equinox 2000.0), which is 0".2
east and 10".3 north of the nucleus of ESO 506-G11.  A KAIT image
taken on Jan. 20.36 showed nothing at this position (limiting mag
     M. Modjaz, R. Kirshner and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 350-740 nm)
of SN 2005an, obtained on Mar. 4.38 UT by H. Hao with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be most
probably a young type-II supernova.  The noisy spectrum consists of
a featureless and blue continuum and is similar to an early
spectrum of SN 1993J (Matheson et al. 2000, A.J. 120, 1487).  A
spectrum of SN 2005am (cf. IAUC 8490), obtained on Mar. 3.29, shows
it to be a type-Ia supernova, one or two weeks before maximum.  The
supernova expansion velocity, derived from the minimum of Si II
(rest 635.5 nm) and adopting the NED recession velocity of 2368
km/s for the host galaxy, is about 12700 km/s.

     A. F. Tubbiolo reports his discovery of a comet on images
taken with the 0.9-m Spacewatch reflector at Kitt Peak (discovery
observation given below), noting a tail approximately 13" long to
the northwest on the discovery images, with a tail and coma noted
on CCD images taken on Mar. 4.41-4.45 UT.  Following posting on the
'NEO Confirmation Page', co-added R-band images taken by A.
Fitzsimmons, S. Lowry, and C. Snodgrass with the 2-m 'Faulkes
Telescope North' at Haleakala on Mar. 4.4 show a faint tail 15"
long in p.a. 300 deg.  CCD images taken by M. Tichy and J. Ticha
with the 1.06-m telescope at Klet on Mar. 4.9 show the comet to be

     2005 UT             R.A. (2000) Decl.       Mag.
     Mar.  3.25502   11 48 54.36   + 2 34 40.5   20.9

     The available astrometry, the following indeterminate
parabolic orbital elements, an ephemeris appear on MPEC 2005-E35.

     T = 2006 Nov. 15.867 TT          Peri. = 296.728
                                      Node  = 357.877   2000.0
     q = 1.66913 AU                   Incl. =  17.439

                      (C) Copyright 2005 CBAT
2005 March 7                   (8491)            Daniel W. E. Green

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