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Circular No. 8915 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://www.cfa.harvard.edu/iau/cbat.html ISSN 0081-0304 Phone 617-495-7440/7244/7444 (for emergency use only) COMET C/2008 C1 (CHEN-GAO) J. Beize, Beijing Technology and Business University, reports the discovery of a comet by Tao Chen (Suzhou City, Jiangsu province, China) on a CCD image taken on Feb. 1 by Xing Gao (Urumqi, Xinjiang province) with a wide-field 7-cm, 200-mm-f.l., f/2.8 camera lens (+ Canon 350D camera) at Gao's Xingming Observatory, Mt. Nanshan, in the course of a nova survey; subsequent images of the comet were identified on earlier exposures that had been taken by Gao on Jan. 30 (when the comet appeared at mag 14.0) and Jan. 31 (mag 13.5), and Gao obtained confirming images on Feb. 2 (showing that its brightness increase had continued to mag 12.0). The astrometry tabulated below are only approximate measures of the positions from the poor-scale Xingming images (computer problems has prevented use of an astrometry program to derive better positions, which should follow later). Following posting on the Minor Planet Center's 'NEOCP' webpage, numerous CCD astrometrists have commented on the comet's appearance, including J. Lacruz, Madrid, Spain (0.40-m Ritchey-Chretien reflector, Feb. 2.8 UT; condensed inner coma of diameter 20"; outer coma of diameter 50", slightly elongated in p.a. 35 deg); L. Buzzi and F. Luppi, Varese, Italy (0.60-m f/4.64 reflector, Feb. 2.9; coma at least 2'.5 wide, elongated in p.a. about 30 deg); T. Kryachko, Moscow, Russia (0.30-m f/7.7 Ritchey- Chretien 'Astrotel-Caucasus' telescope in Karachay-Cherkessia, Russia, operated remotely, Feb. 2.89; 1'.2 round coma with central condensation, possibly elongated in p.a. 50 deg or 320 deg; communicated by D. Denisenko); M. Pietschnig, Vienna, Austria (0.35-m f/7 Schmidt-Cassegrain reflector, Feb. 2.95; coma diameter about 2'); and P. C. Sherrod, Conway, AR, U.S.A. (0.51-m f/4 Schmidt-Cassegrain reflector, Feb. 3.04-3.06, with high clouds present; coma diameter about 22", quite uniform in both intensity and in symmetry, with a very distinct stellar condensation of mag 16.4 and some indications of a tail in p.a. about 40 deg). 2008 UT R.A. (2000) Decl. Mag. Observer Jan. 30.91573 22 50 58 +62 15.2 14.0 Gao 31.92406 22 57 08 +62 13.9 13.5 " Feb. 1.66713 23 03 48 +62 12.4 13.0 " 2.64737 23 09 34 +62 11.6 12.0 " The available observations, very preliminary parabolic orbital elements (T = 2008 Apr. 17.216 TT, q = 1.26927 AU, Peri. = 180.781 deg, Node. = 307.451 deg, i = 61.943 deg, equinox 2000.0), and an ephemeris appear on MPEC 2008-C16. (C) Copyright 2008 CBAT 2008 February 3 (8915) Daniel W. E. Green
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