Circular No. 5371 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 TB2 A fast-moving asteroidal object has been independently dis- covered at Palomar by J. Mueller (Oct. 3), on a plate taken by C. Brewer and herself with the Oschin Schmidt telescope, and by C. Shoemaker (Oct. 6), on films taken by herself, E. M. Shoemaker, and D. H. Levy with the 0.46-m Schmidt: 1991 UT R.A. (1950) Decl. Mag. Observer Oct. 3.22778 23 06 28.16 +21 42 59.6 17.5 Mueller 3.27292 23 06 15.25 +21 42 49.3 " 4.25156 23 01 25.07 +21 37 53.4 18 Shoemaker 4.28160 23 01 15.64 +21 37 44.1 " 6.24010 22 51 04.90 +21 24 15.0 " 6.28299 22 50 50.78 +21 23 53.0 " Preliminary orbital elements from the above observations by B. G. Marsden, Center for Astrophysics: T = 1991 Dec. 15.146 ET Peri. = 195.619 e = 0.83579 Node = 296.452 1950.0 q = 0.39357 AU Incl. = 8.648 a = 2.39678 AU n = 0.265620 P = 3.71 years 1991 ET R.A. (1950) Decl. Delta r V Oct. 11 22 23.62 +20 29.0 0.403 1.331 16.9 16 21 51.00 +18 50.7 21 21 15.35 +16 27.1 0.341 1.185 16.9 26 20 37.80 +13 19.9 31 19 59.47 + 9 37.4 0.313 1.031 17.1 Nov. 5 19 21.17 + 5 32.2 10 18 43.24 + 1 17.9 0.317 0.870 18.0 15 18 05.80 - 2 53.9 20 17 29.21 - 6 53.3 0.357 0.702 20.3 EF PEGASI T. Kato and T. Takata, Department of Astronomy, Kyoto Universi- ty, report that CCD photometry with the Ouda 0.60-m reflector re- vealed two superhumps at Oct. 18.445 and 18.536 UT (amplitude 0.14 mag in V), confirming the SU UMa nature of this object. 1991 October 19 Daniel W. E. Green