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IAUC 8126: C/2003 H3; V4745 Sgr

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                                                  Circular No. 8126
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/2003 H3 (NEAT)
     S. H. Pravdo, Jet Propulsion Laboratory, reports the NEAT
discovery on Haleakala images of a comet (discovery observation
given below) with a coma diameter of about 14" and an unresolved
core of diameter about 4" or less.  Following posting on the NEO
Confirmation Page, other observers have also reported the cometary
appearance from CCD images, including J. E. McGaha (0.30-m
reflector, Tucson, AZ; fainter outer coma of diameter about 10"
with a brighter core of diameter about 5"); J. Young (0.6-m
reflector, Table Mountain; coma diameter about 8", and 16" tail in
p.a. 250 deg, affected by cirrus clouds), and P. R. Holvorcem and
M. Schwartz (Tenagra IV 0.36-m telescope, near Nogales, AZ; coma
diameter 28" and m_1 = 15.4-15.7 on May 1.47).

     2003 UT             R.A. (2000) Decl.        m1
     Apr. 30.45200   19 43 46.25   -14 40 20.7   17.2

The available astrometry, the following very preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2003-J02.

     T = 2003 Oct. 27.074 TT          Peri. =  82.997
                                      Node  = 270.627   2000.0
     q = 1.75468 AU                   Incl. =  52.397


V4745 SAGITTARII
     Red magnitude estimates of V4745 Sgr by W. Liller, Vina del
Mar, Chile, from Technical Pan films taken with an orange filter:
Apr. 19.179 UT, 7.8 (thin clouds); 23.197, 8.3 (moon nearby);
27.205, 8.1; 27.208, 8.3.
     T. Kato, Kyoto University, reports the following magnitude
estimates for V4745 Sgr:  Apr. 8.355 UT, V = [14.0 (G. Pojmanski,
Warsaw University Observatory; ASAS-3 system, Las Campanas
Observatory); 8.790, [12.0 (H. Nishimura, Kakegawa, Shizuoka,
Japan; 200-mm f/4 lens + T-Max 400 film); 9.759, [11.0 (Nishimura);
9.80, [12.0 (K. Haseda, Aichi, Japan; Tri-X film); 10.366, V =
10.63 (Pojmanski); 12.338, V = 8.37 (Pojmanski); 12.765, 8.5
(Nishimura); 13.27, 7.3 (R. Y. Shida, Sao Paulo, Brazil; digital
camera); 14.335, V = 8.02 (Pojmanski); 15.353, V = 7.80
(Pojmanski); 18.363, V = 7.41 (Pojmanski); 21.730, 8.5 (Nishimura);
25.708, V = 9.16 (S. Kiyota, Tsukuba, Japan); 26.286, V = 9.26
(Pojmanski); 26.734, 9.2 (Nishimura); 26.762, 9.0 (Haseda); 30.359,
V = 9.44 (Pojmanski).

                      (C) Copyright 2003 CBAT
2003 May 1                     (8126)            Daniel W. E. Green

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