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IAUC 8393: C/2004 Q1; 2004ch, 2004do

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                                                  Circular No. 8393
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 Q1 (TUCKER)
     Roy A. Tucker, Tucson, AZ, reports his discovery of a comet
with a coma diameter of about 50" and a 70" tail in p.a. about 230
deg (discovery observation below) on unfiltered CCD images taken
with a 0.35-m reflector.  Following posting on the 'NEO
Confirmation Page', the object was also noted to be cometary on CCD
images taken by J. Foster (University Hills, Los Angeles, CA,
0.32-m f/5.6 reflector; fan tail in p.a. 235 deg on Aug. 24.4 UT)
and by J. E. McGaha (Tucson, AZ, 0.36-m f/10 reflector; faint 26"
coma with a very faint fan-shaped tail 30" long in p.a. 250 deg on
Aug. 25.35).  Images by Tucker on Aug. 25.5 show a 30" coma and a
tail about 40" long in p.a. 255 deg.

     2004 UT             R.A. (2000) Decl.       Mag.
     Aug. 23.45566    2 42 20.76   + 2 08 54.4   14.6

The available astrometry and the following preliminary parabolic
orbital elements appear on MPEC 2004-Q43 (ephemeris:  H = 10.0,
n = 3).

     T = 2004 Dec. 10.500 TT          Peri. =  35.562
                                      Node  =  21.955   2000.0
     q = 2.00387 AU                   Incl. =  56.610

2004 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase   Mag.
Aug. 23     2 42.36   + 2 01.0   1.841   2.394  110.7   23.3   14.2
     28     2 41.82   + 3 30.2   1.748   2.362  115.2   22.8   14.0
Sept. 2     2 40.41   + 5 06.6   1.658   2.332  120.0   22.0   13.9
      7     2 38.01   + 6 51.0   1.572   2.303  124.9   21.0   13.7
     12     2 34.48   + 8 44.3   1.491   2.274  130.2   19.8   13.5
     17     2 29.69   +10 47.2   1.415   2.247  135.7   18.2   13.4
     22     2 23.53   +12 59.9   1.346   2.221  141.4   16.4   13.2
     27     2 15.88   +15 22.0   1.285   2.196  147.3   14.3   13.1
Oct.  2     2 06.68   +17 52.4   1.232   2.172  153.1   12.0   13.0


SUPERNOVAE 2004ch AND 2004do
     M. Salvo and B. Schmidt, Australian National University (ANU),
report on preliminary reduction of spectra taken with the ANU 2.3-m
telescope (+ Double-Beam spectrograph) at Siding Spring:  SN 2004do
(cf. IAUC 8382), Aug. 19.37 UT, type-Ia supernova, about 10 days
past maximum light; SN 2003ch (cf. IAUC 8353), Aug. 20.58, type-II
supernova, a couple of months past maximum light.

                      (C) Copyright 2004 CBAT
2004 August 25                 (8393)            Daniel W. E. Green

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