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IAUC 8450: C/2004 X2; 2004gp; 2004go

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IAUC number

                                                  Circular No. 8450
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 asteroidal object discovered by the LINEAR
project (discovery observation below), and posted on the 'NEO
Confirmation Page', has been found to be cometary in appearance.
R-band observations taken by C. Hergenrother with the Catalina
1.54-m reflector on Dec. 9.55 UT show a coma 25" in diameter and a
slightly curved 50" tail in p.a. 325 deg.  CCD images taken by J. E.
McGaha (Tucson, AZ, 0.36-m f/10 reflector) on Dec. 10.4 show a 3"
coma with a 12" tail in p.a. 300 deg.

     2004 UT             R.A. (2000) Decl.       Mag.
     Dec.  8.46681    9 31 07.95   +12 34 01.7   18.9

The available astrometry (including LONEOS observations from Nov.
19), the following parabolic orbital elements, and an ephemeris
appear on MPEC 2004-X35.

     T = 2004 Aug. 25.890 TT          Peri. = 162.526
                                      Node  = 307.353   2000.0
     q = 3.79930 AU                   Incl. =  72.173

     A. Garg, M. Huber, P. Garnavich, P. Challis, C. Stubbs, and
the SuperMACHO collaboration (cf. IAUC 8439) report the detection
with the Cerro Tololo 4-m telescope (+ MOSAIC imager) on Oct. 19 of
a supernova (magnitude 'VR' about 21.0 at peak) located at R.A. =
4h53m38s.96, Decl. = -68o47'02".8 (equinox 2000.0), which is 0".28
east and 0".12 north of a galaxy (whose magnitude is I = 18.7)
situated behind the Large Magellanic Cloud.  The new object was
also detected in 4-m-telescope observations on Sept. 18, Oct. 5, 11,
17, 23, and Nov. 6.  Spectroscopy obtained on the Magellan Clay
telescope (+ LDSS-2 spectrograph) on Nov. 6 indicates that SN 2004gp
is a type-II supernova at a redshift of 0.067.

SUPERNOVA 2004go IN IC 270
     N. Morrell, M. Hamuy, G. Folatelli, and M. Phillips, Carnegie
Supernova Project, report that a CCD spectrogram (range 380-923 nm)
of SN 2004go (cf. IAUC 8448), obtained on Dec. 9.23 UT with the Las
Campanas du Pont 2.5-m telescope (+ WFCCD spectrograph), shows it
to be a type-Ia supernova, probably 3 to 4 weeks after maximum

                      (C) Copyright 2004 CBAT
2004 December 10               (8450)            Daniel W. E. Green

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