Circular No. 9187 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION New postal address: Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. CBATIAU@EPS.HARVARD.EDU ISSN 0081-0304 URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network COMET C/2010 KW_7 (WISE) R. S. McMillan, University of Arizona, reported that the presumed asteroidal object 2010 KW_7 discovered by the WISE spacecraft (discovery observation tabulated below; cf. MPEC 2010-K29; IAUC 9180) appeared slightly more diffuse than nearby stars in images taken with the Steward Observatory 0.9-m reflector (+ CCD mosaic) on Oct. 18.5 UT. J. V. Scotti also reported that nine 120-s co-added R-band images taken on Oct. 18.5 with the 2.3-m Bok telescope at Kitt Peak reveal a coma diameter of 8" with a very faint tail extending about 9" in p.a. 215 deg. Scotti's further co-added images taken on Oct. 28.5 with the Spacewatch 1.8-m reflector show a coma diameter of 6".3 (total mag 20.1-20.5) and a broad, faint, fan-shaped tail extending 0'.14 spanning p.a. 222-305 deg. McMillan also reports (via A. Mainzer, Jet Propulsion Laboratory) that Scotti has measured a coma diameter of 8".5 on images taken by T. H. Bressi with the 1.8-m Spacewatch II telescope on Nov. 11 -- and with a coma diameter of 7".4 with a broad, fan- shaped tail structure extending about 8".8 towards p.a. 180.3 degrees and faintly to a length of about 8".0 in p.a. 275.5 deg (where the brightest part of the fan was) on R-band images taken by McMillan, Scotti, and M. L. Terenzoni at the 2.3-m Bok telescope (+ 90Prime CCD camera) also on Nov. 11. J. M. Bauer and J. D. Goguen, Jet Propulsion Laboratory (JPL), California Institute of Technology, report (also via Mainzer) that four 300-s R-band images of 2010 KW_7 were taken on Nov. 7.54-7.55 UT with the Palomar 5-m reflector in about 1".5 seeing; the stacked images reveal a coma and a faint tail extension approximately 7"-8" in p.a. 287 deg (or roughly anti-solar). T. Grav and M. Huber, Johns Hopkins University; and J. Bauer, JPL, report (also via Mainzer) that eight stacked 90-s SDSS-r-band images of 2010 KW_7, obtained during Nov. 2.44-2.46 UT with the Apache Point Observatory's 3.5-m telescope (+ SPICAM CCD camera) show an apparent coma and a faint tail 4"-5" long in p.a. 286 deg. 2010 UT R.A. (2000) Decl. Observer May 16.06415 9 22 33.13 -21 18 18.8 WISE The following orbital elements by G. V. Williams are from 57 observations spanning 2010 May 16-Nov. 17. Epoch = 2010 Oct. 11.0 TT T = 2010 Oct. 11.3479 TT Peri. = 332.3059 e = 0.974263 Node = 104.7603 2000.0 q = 2.570377 AU Incl. = 147.0620 (C) Copyright 2010 CBAT 2010 November 23 (9187) Daniel W. E. Green
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