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IAUC 8828: C/2007 G1; 2007at, 2007au

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                                                  Circular No. 8828
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2007 G1 (LINEAR)
     An apparently asteroidal object discovered by the LINEAR
survey (discovery observation tabulated below), and posted on the
Minor Planet Center's 'NEOCP' webpage, has been found by other
astrometrists to have a cometary appearance.  G. Sostero and E.
Guido (Castellammare di Stabia, Italy, observing remotely with a
0.25-m f/3.4 reflector near Mayhill, NM) write that co-adding of 23
unfiltered 60-s exposures from Apr. 11.48 UT shows a small coma of
total mag 17.8 nearly 10" in diameter, elongated toward p.a. 260
deg; additional co-added 60-s images by Guido, A. Lepardo, and
Sostero (0.45-m f/4.4 reflector at Remanzacco, Italy) on Apr. 11.91
show a faint coma nearly 8" in diameter.  R. Ligustri (Udine, Italy,
0.32-m f/9 reflector) reports that ten 120-s images reveal a
cometary appearance.  P. Birtwhistle (Great Shefford, Berkshire,
England, 0.40-m f/6 Schmidt-Cassegrain reflector) reports that
images taken on Apr. 12.05-12.15 at a scale of 1"/pixel show a 5"
coma, extended 6" on the southwest side (p.a. about 240 deg).

     2007 UT             R.A. (2000) Decl.       Mag.
     Apr. 10.37946   18 05 10.44   +33 53 44.3   18.6

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-G37.

     T = 2009 Mar.  8.637 TT          Peri. = 232.663
                                      Node  =  72.236   2000.0
     q = 2.46334 AU                   Incl. =  94.461


SUPERNOVAE 2007at AND 2007au
     Two supernovae have been discovered on unfiltered CCD frames
by W. Li and N. Lee (LOSS/KAIT; cf. IAUC 8822).  Discovery
observations:

SN      2007 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007at  Mar. 18.53  14 51 12.28  -21 23 31.2  17.7  7".7 E, 7".8 S
2007au  Mar. 18.19   7 11 46.11  +49 51 13.4  17.0  41" E, 31" S

Additional information is available on the following Electronic
Telegrams:  2007at in ESO 580-G44, CBETs 893, 898, 899, and 900
(type-Ia, discovered about 9 days after maximum light); 2007au in
UGC 3725, CBETs 895, 898, and 900 (type-Ia, discovered a couple of
days before maximum).

                      (C) Copyright 2007 CBAT
2007 April 12                  (8828)            Daniel W. E. Green

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