Circular No. 4149 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 PERIODIC COMET HALLEY (1982i) T. Morley, European Space Operations Centre, communicates: "M. Wallis and R. Gilmozzi, on behalf of the European IUE/Halley team, report that UV spectra were obtained with the International Ultraviolet Explorer on Dec. 2, including mapping of the coma in Lyman-S and a resolved spectrum of the OH (0-0) band. The nuclear magnitude was low (FES magnitude = 10.9), though the coma filled the 16' x 16' field; the base of an eastward (tail) extension was seen. The H and OH emissions were relatively weak, below the early-Nov. value; O and C emissions were marginal and thus abnormally weak, although 250-300-nm molecular and continuum emissions were very strong. A secondary source suggesting an outburst is evident 1500-3000 km south of the nucleus, in OH, CS and continuum emissions around Dec. 2.542 UT." J. D. Bregman and F. C. Witteborn, Ames Research Center, NASA; and D. M. Rank and D. Wooden, Lick Observatory, report: "We observed P/Halley with the 3-m Shane telescope (spectral resolution 50) on Nov. 6-7 and found an absorption feature, centered at 3.1 microns and ~ 0.2 microns wide, which we attribute to water ice." K. R. Bondal, Uttar Pradesh State Observatory, reports observations made by P. S. Goraya and B. S. Rautela made with the 1-m reflector at Naini Tal, using the Hilger and Watts spectrum scanner (0.9-nm resolution; range 300-700 nm) on Nov. 22.7 and 23.7 UT, yielding the following tentative spectral identifications of emission features: CN (1-0) 358-nm, CN (0-0) 388-nm, CH (0-0) + C3 405- nm, CN (0-1) 420-nm, C2 (2-0) + CH (0-0) 435-nm, C2 (1-0) 470-nm, C3 (0-0) 516-nm, C2 (0-1) 564-nm, and C2 (0-2) 619-nm. Selected total visual magnitude estimates: Nov. 10.95 UT, 7.2 (J.-C. Merlin, Le Creusot, France, 7x50 binoculars); 12.16, 5.7 (C. Spratt, Victoria, BC, 11x80 binoculars); 13.14, 7.5 (C. Stephan, Sebring, FL, 0.36-m reflector); 15.17, 6.1 (J. E. Bortle, Stormville, NY, 10x50 binoculars); 16.94, 5.8 (M. Cavagna, Valcava, Italy, 10x50 binoculars); 19.32, 5.5 (C. S. Morris, near Mt. Wilson, CA, 20x80 binoculars; tail 0.67 deg long in p.a. 90); 22.43, 5.5 (Morris; 0.33 deg tail in p.a. 75); 29.74, 5.4 (Merlin); Dec. 1.15, 5.2 (R. Keen, Golden, CO, 8x40 binoculars); 4.74, 4.8 (Merlin, naked eye; coma dia. 70'); 6.88, 4.7 (Merlin, naked eye; coma dia. 60', tail length 95'); 9.10, 4.4 (Spratt, 11x80 binoculars; tail 30' long at p.a. 70); 10.13, 4.3 (D. W. E. Green, Cambridge, MA, 7x50 binoculars); 12.95, 4.1 (Green). 1985 December 13 (4149) Daniel W. E. Green
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