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IAUC 8127: P/2003 H4; V4745 Sgr; Corrs

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                                                  Circular No. 8127
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 P/2003 H4
     M. Bezpalko, Lincoln Laboratory, Massachusetts Institute of
Technology, reports the discovery by LINEAR of a comet with a tail
in p.a. 270 deg on images taken on Apr. 29.3 UT (discovery
observation below).  Following posting on the NEO Confirmation Page,
other CCD observers have also reported the object as cometary,
including G. J. Garradd (Tamworth, N.S.W., 0.45-m reflector;
slightly diffuse on most images taken on Apr. 30.6), J. E. McGaha
(Tucson, AZ, 0.30-m reflector; faint coma of size 5" x 10" and m_1
= 17.7-17.9, aligned north-south, with uniform brightness and no
apparent nuclear condensation or core on May 2.2), and J. G. Ries
(McDonald Observatory, 0.76-m reflector; 20" tail pointing slightly
south of west on May 2.3; m_1 = 17.7-18.0).

     2003 UT             R.A. (2000) Decl.        m1
     Apr. 29.32742   16 06 33.56   -19 09 49.0   19.0

The available astrometry, the following preliminary orbital
elements, and an ephemeris appear on MPEC 2003-J14.  These elements
indicate that the comet passed 0.4 AU from Jupiter in Aug. 2000.

     T = 2003 May  13.417 TT          Peri. =  10.054
     e = 0.47584                      Node  = 226.635   2000.0
     q = 1.68842 AU                   Incl. =  17.746
       a =  3.22117 AU     n = 0.170484     P =   5.78 years


V4745 SAGITTARII
     Further photoelectric photometry by A. C. Gilmore at Mt. John
(cf. IAUC 8123; uncertainties 0.02 mag or less in all colors): Apr.
28.635 UT, V = 9.31, U-B = -0.84, B-V = -0.09, V-R = +0.55, V-I =
+0.32, airmass 1.09; 29.506, 9.37, -0.88, -0.08, +0.54, +0.28, 1.33.
     CCD photometry by J. D. West, Mulvane, KS:  Apr. 27.46 UT, V =
9.65, R_c = 8.90; 29.439, V = 9.22; 30.425, V = 9.55.
     Concerning his magnitudes on IAUC 8123, M. Yamamoto adds that
he used a green (PO0) filter whose reponse approaches that of the V
band.


CORRIGENDA
     On IAUC 8089, second item, lines 10 and 11, the designations
SHOULD READ  SN 2003bo and SN 2003bp.

                      (C) Copyright 2003 CBAT
2003 May 2                     (8127)            Daniel W. E. Green

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