Circular No. 3047 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Cable Address: SATELLITES, NEWYORK Telex: 921428 Telephone: (617) 864-5758 OCCULTATIONS BY URANUS AND (6) HEBE R. Barrow, Gerard P. Kuiper Airborne Observatory, has relayed word from Perth of successful observations by J. L. Elliot in the southern Indian Ocean of last night's occultation of SAO 158687 by Uranus. A secondary occultation was also observed, this presumably being caused by a small body (not Miranda) in orbit about Uranus. J. Hers reports that heavy rain prevented observations in the vicinity of Johannesburg. Preliminary reports reaching D. Dunham, Computer Sciences Corporation, suggest that the central line of the occultation of gamma Cet by (6) Hebe passed between 50 and 90 km north of Mexico City. Near the latter point the event lasted 55, beginning on Mar. 5d02h34m54s UT. A 2.5s-duration occultation was observed in Mexico City itself. COMET LOVAS (1977c) Yamamoto Circ. No. 1847 and Orient. Astron. Assoc. Comet Bull. No. 144 give the following approximate position by N. Kojima: 1977 UT R. A. (1950) Decl. m1 Feb. 24.62396 10 30.6 +34 57 16 The image is diffuse, without a tail, and the position is in good agreement with the data on IAUC 3042. Subsequently, however, a report from the Tokyo Observatory casts doubt on the reality of this image and notes that T. Seki failed to find the comet near the expected position. Observations are urgently desired. A1540-53 P. J. N. Davison, University College, London, writes that news of his discovery of an x-ray pulsator near 3U 1538-52 (cf. IAUC 3039) was contained in a preprint issued in Nov. 1976 (Monthly Notices Roy. Astron. Soc. in press). The observation was made on l976 Sept. 6-7, and the period was determined to be 528s.7 +/- 0s.4. The best estimate of the source's position, R.A. = 15h41m.2, Decl. = -53o.4 (equinox 1950.0), is > 1o from 3U 1538-52, which appeared to be at an intensity well below that given in the Uhuru catalogue. The 90-percent-confidence box for A1540-53 is a 0o.5 x 0o.2 ellipse, the major axis being approximately in the direction of 3U 1538-52. 1977 March 11 (3047) Brian G. Marsden
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