Circular No. 9144 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: D. W. E. Green, Room 209; Department of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU URL http://www.cfa.harvard.edu/iau/cbat.html ISSN 0081-0304 COMET P/2010 H5 (SCOTTI) An object with slight cometary appearance was discovered by J. V. Scotti on images obtained with the Spacewatch 0.9-m reflector at Kitt Peak (discovery observation tabulated below). Scotti notes that co-added images taken on Apr. 22 with the 1.8-m Spacewatch reflector consistently show a faint extension about 5" in p.a. 287 deg; the very subtle feature is visible on all three images. Images taken on May 3 and 4 with the 1.8-m telescope show the object to be slightly softer and slightly larger than stars of similar brightness. R-band images taken by W. H. Ryan and E. V. Ryan with the Magdalena Ridge 2.4-m reflector on May 8.2 show a "fuzzy" object of mag 20 with its FWHM significantly greater than those of nearby field stars. 2010 UT R.A. (2000) Decl. Mag. Observer Apr. 21.15333 13 09 46.19 - 5 57 06.5 20.7 Scotti The available astrometry (including prediscovery Spacewatch images from Mar. 18 and Mt. Lemmon images from Mar. 21 and Apr. 10, identified by T. Spahr, Minor Planet Center), the following elliptical orbital elements, and an ephemeris appear on MPEC 2010-J45. T = 2010 Apr. 11.295 TT Peri. = 174.673 e = 0.15594 Node = 24.896 2000.0 q = 6.02769 AU Incl. = 14.096 a = 7.14129 AU n = 0.051646 P = 19.08 years COMET P/1999 J6 = 2004 V9 = 2010 H3 (SOHO) Further to IAUC 9138, additional astrometry from STEREO-SECCHI HI1-A images on Apr. 20-22 appears on MPEC 2010-J28, where B. G. Marsden also presents a non-gravitational three-apparition orbital linkage (in partial collaboration with R. Kracht) from 255 observations spanning 1999-2010 (mean residual 17".4; A_1 = +0.31, A_2 = -0.1892) including the following elements for epoch 2010 May 4.0 TT: T = 2010 Apr. 19.8921 TT, q = 0.047573 AU, e = 0.984616, Peri. = 24.8606 deg, Node = 78.3483 deg, i = 23.8790 deg (equinox 2000.0), P = 5.44 years. The object passed 0.014 AU from the moon on 1999 June 12.09, 0.013 AU from the earth on 1999 June 12.19, and 1.16 AU from Jupiter on 2008 June 24; a moderately close approach to the earth of 0.32 AU occurs on 2010 May 29. MPEC 2010-J28 includes an ephemeris (estimated uncertainty about 1') in the hope that the comet might be observable around mag 20-21 (brightness highly uncertain) in the next couple of months as it approaches opposition in mid-June. (C) Copyright 2010 CBAT 2010 May 8 (9144) Daniel W. E. Green
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