Circular No. 5075 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 V1521 CYGNI E. B. Waltman, R. L. Fiedler, and K. J. Johnston, Naval Research Laboratory; and F. Ghigo, National Radio Astronomy Observatory, report that the source Cygnus X-3 (V1521 Cyg) is flaring at radio frequencies. The NRL-Green Bank Interferometer Monitoring Program observed intensities of 8 Jy at 8.3 GHz and 7 Jy at 2.2 GHz on Aug. 15.0 UT. 1990 MB With reference to IAUC 5067, H. Kinoshita, National Astronomical Observatory, Tokyo, writes that a 10 000-year integration by M. Yoshikawa using the orbital elements given there "clearly shows this minor planet is a stable Martian Trojan"; and K. A. Innanen, York University, Toronto, notes in the abstract of a very recent paper by S. Mikkola and himself that "contrary to intuition, there is clear empirical evidence for the stability of motion around the L4 and L5 points of all the terrestrial planets over a timeframe of several million years". E. Bowell, Lowell Observatory, provides the improved orbital elements below from observations that now cover a 40-day arc. These new figures indeed suggest greater stability than do the set on IAUC 5067, and a computation by B. G. Marsden, Center for Astrophysics, shows the object's distance from Mars to change only from 1.5-1.8 AU around 1850 to 1.3-1.6 AU around 2400. Epoch = 1990 Nov. 5.0 ET T = 1990 Oct. 29.1464 ET Peri. = 95.2727 e = 0.064820 Node = 244.4595 1950.0 q = 1.424769 AU Incl. = 20.2806 a = 1.523524 AU n = 0.5241192 P = 1.881 years COMET LEVY (1990c) Total visual magnitude estimates (cf. IAUC 5070): Aug. 7.05 UT, 5.4 (B. H. Granslo, Fjellhamar, Norway, 7x35 binoculars); 9.14, 5.5 (A. Pereira, Linda-a-Velha, Portugal, 9x34 binoculars); 11.20, 4.5 (C. S. Morris, Pine Mountain Club, CA, naked eye); 13.71, 4.6 (M. Ohkuma, Tokyo, Japan, 11x80 binoculars); 15.17, 4.3 (G. Kronk, Troy, IL, naked eye). 1990 August 15 (5075) Daniel W. E. Green
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