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Circular No. 6239 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science) Phone 617-495-7244/7440/7444 (for emergency use only) SUPERNOVA 1995ad IN NGC 2139 R. Evans, Coonabarabran, N.S.W., reports his visual discovery of a supernova located 25" west and 5" south of the nucleus of NGC 2139 (R.A. = 6h01m.1, Decl. = -23o40', equinox 2000.0); on Sept. 28.8 UT, Evans estimated mv = 14.0-14.5, noting that nothing was visible at this location on Aug. 25 (0.41-m reflector). S. Benetti, European Southern Observatory (ESO); D. Grupe, Universitats-Sternwarte, Gottingen, report: "Inspection of a fully-reduced CCD spectrogram (range 390-784 nm, resolution 0.4 nm) obtained on Sept. 29.30 UT with the ESO 1.5-m telescope (+ Boller & Chivens spectrograph) at La Silla confirms this object as a type-II supernova around maximum. The spectrum consists of a broad- symmetric (FWHM = 11000 km/s) H-alpha emission, and P-Cyg profiles of H-delta, H-gamma, and H-beta. The lines are superimposed on a blue continuum (Tbb about 13 000 K). The expansion velocity deduced from the minima of the H lines is about 9500 km/s. The He I 587.6-nm line is also present with a P-Cyg profile, and it shows a slower expansion velocity (about 8800 km/s). The velocity shift (1790 km/s) of a narrow H-alpha emission component is consistent with the recession velocity of NGC 2139." GRO J2058+42 J. E. Grove, Naval Research Laboratory, reports on behalf of the Compton Gamma Ray Observatory (CGRO) OSSE team: "We have further constrained the position for GRO J2058+42 using the OSSE instrument on the CGRO. Data from a 1-dimensional scan through the source region were combined with the published BATSE error box (IAUC 6238) to yield a new 95-percent confidence region of size about 30' x 60', bounded by a quadrilateral with the following vertices (equinox 2000.0): R.A. = 21h00m.5, Decl. = +41o42'; 20h59m.5, +42o12'; 20h57m.5, +41o21'; 20h58m.3, +40o51'. Follow-up observations in other wavebands to identify the object are encouraged." COMET P/1995 S1 (DE VICO) Visual m1 estimates: Sept. 22.29 UT, 6.3 (A. Dimai, Cortina d'Ampezzo, Italy, 0.50-m reflector); 23.46, 6.4 (W. Dillon, Missouri City, TX, 7x50 binoculars); 24.11, 6.2 (K. Sarneczky, Raktanya, Hungary, 20x60 binoculars); 25.86, 6: (D.-q. Zhang, China; independent discovery); 26.21, 5.7 (A. Pereira, Cabo Ruivo, Portugal, 9x34 binoculars); 27.17, 5.9 (S. Baroni, Milan, Italy, 20x80 binoculars); 28.43, 5.8 (G. W. Kronk, Troy, IL, 20x80 binoculars); 29.18, 5.4 (J. D. Shanklin, Cambridge, England, naked eye). 1995 September 29 (6239) Daniel W. E. Green
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