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Circular No. 8703 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/2006 GZ_2 (SPACEWATCH) An apparently asteroidal object discovered by Spacewatch (discovery observation below) was reported already on Apr. 7.9 UT to be slightly diffuse in follow-up images obtained in strong moonlight by J. Ticha and M. Tichy with the 1.06-m telescope at Klet. With no other reports on physical appearance available, the object was announced as 2006 GZ_2 on Apr. 10 (MPEC 2006-G38; also MPS 168881), but on the following day, J. Montani reported that his inspection of the Spacewatch images from Apr. 7.2, 8.2, and 9.2 all show the object to have a coma of diameter 5"-6" and no tail. R. S. McMillan adds that Spacewatch images taken by T. H. Bressi on Apr. 18.4 also show the object to be diffuse with a 4"-5" coma. 2006 UT R.A. (2000) Decl. Mag. Apr. 7.18152 12 53 41.82 - 0 16 27.9 20.1 More recent astrometry, the following parabolic orbital elements, and an ephemeris appear on MPEC 2006-H10. T = 2006 Aug. 22.050 TT Peri. = 191.508 Node = 355.320 2000.0 q = 3.30214 AU Incl. = 168.683 COMET 73P/SCHWASSMANN-WACHMANN Futher to IAUC 8701, numerous additional components to 73P have been observed on three or more nights and thus given designations ('T'-'Z', and 'AA'-'AM', although component 'Y' has only two nights of astrometry so far) and first announced on MPECs 2006-G10 and 2006-H03. COMET P/2006 G1 (McNAUGHT) Additional observations published on MPEC 2006-G43 and MPC 56610 show that this comet (cf. IAUC 8699) is indeed of short period, with the following improved orbital elements: T = 2006 Aug. 20.7210 TT Peri. = 314.8793 e = 0.455391 Node = 299.0576 2000.0 q = 2.621261 AU Incl. = 18.5516 a = 4.813108 AU n = 0.0933395 P = 10.56 years (C) Copyright 2006 CBAT 2006 April 19 (8703) Daniel W. E. Green
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