Circular No. 4197 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444 COMET HARTLEY (1986c) Malcolm Hartley, U.K. Schmidt Telescope Unit, Siding Spring, reports his discovery of a comet of magnitude ~ 17-18 with a faint tail evident: 1986 UT R.A. (1950.0) Decl. Mar. 15.59361 11 22 52.78 - 7 27 45.7 17.67951 11 20 54.53 - 7 11 14.2 20.60691 11 18 13.08 - 6 47 55.4 The following parabolic orbital elements are very uncertain. A low-inclination, short-period orbit gives similar residuals. T = 1985 June 20.07 ET Peri. = 185.39 Node = 179.23 1950.0 q = 0.0759 AU Incl. = 59.76 1986 ET R.A. (1950.0) Decl. p r m1 Mar. 11 11 27.33 - 8 04.2 3.476 4.452 17.2 21 11 17.86 - 6 44.8 31 11 09.42 - 5 27.2 3.733 4.678 17.6 Apr. 10 11 02.34 - 4 15.0 20 10 56.79 - 3 11.1 4.118 4.898 18.0 30 10 52.84 - 2 17.0 May 10 10 50.41 - 1 33.4 4.594 5.114 18.4 20 10 49.40 - 1 00.2 30 10 49.65 - 0 36.8 5.120 5.325 18.8 SUPERNOVA 1986D IN M82 M. J. Lebofsky, G. H. Rieke, and W. F. Kailey, Steward Observatory, communicate their discovery on Mar. 21.1 UT of a supernova in M82, located at R.A. = 9h51m42s0, Decl. = +69deg54'59" (equinox 1950.0). The object was only observed at 2 microns (magnitude 10), and it appears to be heavily obscured, located ~ 9" west and 2" south of the 2-micron nucleus of the galaxy; the supernova was not visible on a TV monitor, indicating an upper limit of V ~ 16. The object was also observed Mar. 22 and 23. Previous observations by Rieke et al. (1980, Ap.J. 238' 24) in 1978 and by J. L. Pipher and W. J. Forrest, University of Rochester, in 1983 Mar. show no 2-micron object at this location. 1986 March 24 (4197) Daniel W. E. Green
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