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IAUC 8504: C/2005 G1; 2005az, 2005bb,, 2005bc

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IAUC number


                                                  Circular No. 8504
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)


COMET C/2005 G1 (LINEAR)
     An object reported as apparently asteroidal by the LINEAR
search program (discovery observation given below), and posted on
the 'NEO Confirmation Page', has been found to show a 9" coma and
an 11" tail in p.a. 180 deg on R-band images taken by C.
Hergenrother with the 1.54-m Kuiper reflector at Catalina on Apr.
4.45 UT.

     2005 UT             R.A. (2000) Decl.       Mag.
     Apr.  1.39390   18 12 30.94   +46 18 37.3   19.1

The available astrometry (including prediscovery LINEAR
observations from Mar. 22), the preliminary parabolic orbital
elements (T = 2006 Feb. 28.5 TT, q  = 4.95 AU, Peri. = 114 deg,
Node = 300 deg, i = 108 deg, equinox 2000.0), and an ephemeris
appear on MPEC 2005-G23.


SUPERNOVAE 2005az, 2005bb, AND 2005bc
     Further to IAUC 8493, J. Burket, H. Pugh, and W. Li report the
LOSS discovery of two apparent supernovae on unfiltered KAIT images.
Further to IAUC 8499, T. Puckett and L. Cox also report their
independent discovery of SN 2005bc.  Tabulated LOSS discovery data:

SN      2005 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2005bb  Apr. 1.40   12 57 11.87  - 1 42 17.4   19.8   4".1 W, 6".9 N
2005bc  Apr. 2.44   14 37 15.05  +38 27 23.1   16.6   4".6 E, 7".5 N

Additional magnitudes, from KAIT unless otherwise noted:  SN 2005bb
in UGC 8067, 2004 Dec. 25.41 UT, [20.5; 2005 Jan. 21.44, [19.0; Feb.
3.41, [17.5; Mar. 6.40, 18.0; Apr. 2.41, 19.0.  SN 2005bc in NGC
5698, Mar. 11.43, [20.0; Apr. 4.39, 16.4 (Puckett and Cox).  A
Sloan Digital Sky Survey image of UGC 8067 from 2000 Feb. 12.46
showed nothing at the position of SN 2005bb (limiting mag 22.2).
Puckett reports position end figures 15s.05, 23".7 for SN 2005bc.
     R. Quimby, P. Hoeflich, and J. C. Wheeler, University of Texas;
and C. Gerardy, Imperial College, report that a spectrogram (range
430-890 nm) of SN 2005az (cf. IAUC 8503), obtained on Apr. 2.42 UT
with the 9.2-m Hobby/Eberly Telescope (+ Marcario Low-Resolution
Spectrograph) by M. Shetrone and E. Terrazas, shows it to be a
type-Ic supernova; the spectrum resembles that of SN 1994I near
maximum light (e.g., Clocchiatti et al. 1996, Ap.J. 462, 462).

                      (C) Copyright 2005 CBAT
2005 April 4                   (8504)            Daniel W. E. Green

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