Circular No. 5173 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Telephone 617-495-7244/7440/7444 (for emergency use only) TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505 MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN 1991 BB J. Mueller reports her discovery of a fast-moving asteroidal object on a plate taken by D. Mendenhall in the course of the second Palomar Sky Survey. The following positions are available: 1991 UT R.A. (1950) Decl. Mag. Observer Jan. 16.34600 8 32 36.13 + 5 32 01.5 Shoemaker 16.37673 8 32 27.29 + 5 30 06.7 " 19.31389 8 18 10.16 + 2 25 01.2 17 Mendenhall 19.38333 8 17 49.10 + 2 20 39.3 " 20.31458 8 13 08.83 + 1 20 49.9 " 20.35278 8 12 57.15 + 1 18 24.5 " D. Mendenhall (Palomar). 1.2-m Oschin Schmidt Telescope. Measured by Mueller. C. Shoemaker and D. Levy (Palomar). Prediscovery 0.46-m Schmidt telescope films. Measured by Levy. Preliminary orbital elements by B. G. Marsden, Center for Astrophysics: T = 1991 June 10.990 ET Peri. = 318.447 e = 0.27620 Node = 294.784 1950.0 q = 0.88803 AU Incl. = 41.213 a = 1.22689 AU n = 0.725265 P = 1.36 years 1991 ET R.A. (1950) Decl. Delta r V Jan. 14 8 43.40 + 7 54.2 0.437 1.401 16.2 19 8 19.73 + 2 45.3 24 7 54.24 - 2 36.4 0.406 1.367 16.1 29 7 28.38 - 7 46.8 Feb. 3 7 03.67 -12 24.2 0.421 1.331 16.5 8 6 41.28 -16 16.5 13 6 21.94 -19 22.1 0.471 1.292 17.0 18 6 05.89 -21 47.0 23 5 52.98 -23 39.8 0.537 1.251 17.5 28 5 42.88 -25 08.8 Mar. 5 5 35.17 -26 20.7 0.606 1.208 17.8 1991 January 21 (5173) Daniel W. E. Green
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