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IAUC 8280: P/2003 WC_7; 2004N; C/2002 T7

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IAUC number

                                                  Circular No. 8280
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 was discovered by the LINEAR
project on 2003 Nov. 18 (observed on only two nights) and given the
designation 2003 WC_7 (MPS 91151).  The object was discovered
independently on Jan. 31 by the Catalina Sky Survey and then posted
on the NEO Confirmation Page.  As a result, it has been found to
show cometary appearance on CCD exposures taken by J. Young (Table
Mountain, 0.6-m reflector, Feb. 1.15 UT; very diffuse coma of mag
17.5 and diameter 5", very little central condensation, and a
straight, narrow 10" tail in p.a. 345 deg) and by G. J. Garradd and
R. H. McNaught (Siding Spring, 1.0-m f/8 reflector, Feb. 1.46; coma
diameter 3".5 in 2".5 seeing; no obvious tail visible in five co-
added 40-s frames).  The discovery observations follow:

  Date      UT             R.A. (2000) Decl.       Mag.   Observer
  2003 Nov. 18.14403    1 01 07.41   -27 43 24.9   19.6   LINEAR
  2004 Jan. 31.13554    2 13 16.76   + 3 58 40.8   17.6   Catalina

New astrometry (with prediscovery Catalina data from 2003 Dec. 16),
the following orbital elements, and an ephemeris appear on MPEC

     T = 2004 Feb.  5.7407 TT         Peri. = 341.0539
     e = 0.680818                     Node  =  89.8882  2000.0
     q = 1.654897 AU                  Incl. =  21.2195
       a =  5.184810 AU    n = 0.0834843    P =  11.81 years

     M. Salvo and B. Schmidt, Australian National University (ANU),
report that a spectrogram (range 390-620 nm) of SN 2004N (cf. IAUC
8276), obtained on Jan. 29.6 UT with the ANU 2.3-m telescope (+
Double Beam Spectrograph) at Siding Spring Observatory, shows it to
be a type-Ia supernova.  Cross correlation with a library of type-
Ia supernovae spectra indicates that SN 2004N is approximately 1
+/- 2 days before maximum light, at a redshift of z = 0.05.

     Visual total-magnitude and coma-diameter estimates made with
50-mm binoculars:  Jan. 16.79 UT, 7.4, 11' (J. J. Gonzalez,
Asturias, Spain); 24.12, 6.9, 17' (C. S. Morris, Fillmore, CA);
31.84, 7.5, 7' (Gonzalez).

                      (C) Copyright 2004 CBAT
2004 February 1                (8280)            Daniel W. E. Green

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