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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
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/2004 X2 (LINEAR)
     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


SUPERNOVA 2004gp
     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
light.

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

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