Electronic Telegram No. 283 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 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 2005 UD AND THE DAYTIME SEXTANTIDS K. Ohtsuka, Tokyo Meteor Network, Saitama, Japan; T. Sekiguchi, National Astronomical Observatory of Japan (NAOJ); D. Kinoshita, National Central University, Jung-Li; and J. Watanabe, NAOJ, suggest that the Apollo-type minor planet 2005 UD (MPEC 2005-U22, 2005-U68, 2005-V49) is a possible candidate for the parent object of the daytime Sextantids meteor stream (Sekanina 1976, Icarus 27, 265). Furthermore, it may be a member of the Geminid stream complex (e.g., Cook 1973, in NASA SP-319, p. 183) -- i.e., perhaps a larger fragment of (3200) Phaethon. The phase of orbital evolution of 2005 UD shifts by about 4000 yr or more from the present orbit of Phaethon (Ohtsuka et al. 1999, Earth, Moon and Planets 77, 83). Kinoshita obtained multi-color images of 2005 UD at Lulin observatory (1.0-m f/8 reflector + CCD) on Oct. 31-Nov. 5, but no cometary features were detected. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2005 CBAT 2005 November 11 (CBET 283) Daniel W. E. Green