Circular No. 2881 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 Western Union: RAPID SATELLITE CAMBMASS theta1 ORIONIS A The following visual magnitude estimates indicate that the expected primary minimum on Dec. 5 did occur but that the duration may have been significantly shorter than 24 hours (cf. IAUC 2859): Dec. 5.24 UT, 6.7 (D. di Cicco, Waltham, Massachusetts); 5.577, 8.0 (V. L. Matchett, Indooroopilly, Queensland); 6.23, 6.7 (di Cicco). CI CYGNI Recent observations indicate that this star is having another outburst (cf. IAUC 2788, 2804). Selected visual magnitude estimates: Nov. 6.0 UT, 11.4 (J. Bortle, Brooks Observatory); 21.84, 11.0 (G. M. Hurst, Northampton, England); 24.1, 11.2 (Bortle); 26.88, 10.5 (Hurst); 29.89, 10.0 (Hurst); Dec. 2.0, 10.2 (Bortle) omicron ANDROMEDAE M. Fracassini and L. E. Pasinetti, Merate Observatory, Milan, communicate: "Two spectrograms of omicron And obtained on Dec. 4.7 UT with the Zeiss prism spectrograph (dispersion 35 A/mm at H-gamma) of the 137-cm telescope at the Merate Observatory show that H-beta, H-gamma, H-delta and H-epsilon have absorption cores sharper and deeper than those observed during the whole month of November and in particular on Nov. 28 and 29. Sharp absorption metallic lines have appeared or are enhanced, and it may be that the major shell is developing." COMET BRADFIELD (1975p) J. Hers, Randburg, near Johannesburg, provides the following additional precise position, obtained with a 20-cm reflector: 1975 UT R. A. (1950) Decl. Nov. 17.08507 11 35 15.43 -42 14 38.3 J. B. Trainor, South Caulfield, Victoria (using 12 x 50 binoculars), and T. B. Tregaskis, Mount Eliza, Victoria (instrument not specified), each reported the total magnitude as 8, on Nov. 27.72 and 27.74 UT, respectively. 1975 December 8 (2881) Brian G. Marsden
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