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IAUC 8510: P/2005 GF_8; 2005ba

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IAUC number

                                                  Circular No. 8510
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)

     An apparently asteroid object discovered by the LONEOS project
(discovery observation below) and linked by G. V. Williams, Minor
Planet Center, first with apparently asteroidal Apr. 3 Siding
Spring observations (and designated 2005 GF_8 on MPS 130867) and
later with Apr. 7 LINEAR and Apr. 11 Spacewatch observations, was
posted on the 'NEO Confirmation Page' on Apr. 11.  Following a
request to the Spacewatch observers, J. Scotti and M. Block report
that their CCD images taken on Apr. 12.32-12.35 show the object
(in the glare of a bright background star) as having a tail toward
the east-southeast of the apparently stellar condensation.  G. R.
Jones (Tucson, AZ, 0.40-m reflector) reports that a 12" tail in
p.a. 305 deg is visible on his CCD images from Apr. 13.2 (noting a
red magnitude for the object of 17.5).  P. Birtwhistle (Great
Shefford, Berkshire, England, 0.30-m reflector) writes that his CCD
images taken on Apr. 11.96 and 12.08 in poor seeing show the object
to be less concentrated than a star of similar brightness, with a
diameter of 6"-9".

     2005 UT             R.A. (2000) Decl.       Mag.
     Apr.  2.42548   14 03 47.65   -14 19 53.5   17.8

The available astrometry, the following elliptical orbital elements,
and an ephemeris appear on MPEC 2005-G88.

     T = 2005 Aug. 19.609 TT          Peri. = 286.248
     e = 0.52072                      Node  = 315.009   2000.0
     q = 2.81341 AU                   Incl. =   1.186
       a =  5.87012 AU     n = 0.069300     P =  14.2 years

SUPERNOVA 2005ba IN NGC 3746
     R. J. Foley, M. Ganeshalingam, D. S. Wong, B. J. Swift, and
A. V. Filippenko, University of California, Berkeley, report that
inspection of CCD spectra (range 330-1000 nm), obtained Apr. 11 UT
with the Shane 3-m telescope at Lick Observatory, shows that SN
2005ba (IAUC 8503) is of type II, probably within 2-3 weeks after
the explosion.  The spectrum consists of a blue, relatively
featureless continuum with P-Cyg H lines.  Adopting the NED
redshift of 9022 km/s, the expansion velocity derived from the
minimum of the H_beta absorption line is about 11000 km/s.

                      (C) Copyright 2005 CBAT
2005 April 13                  (8510)            Daniel W. E. Green

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