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Circular No. 5765 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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU) NOVA OPHIUCHI 1993 Paul J. Camilleri, Cobram, Vic., Australia, reports his discovery of an apparent nova on T-Max patrol films taken with an 85- mm camera lens. The object is located at R.A. = 17h22m.1, Decl. = -23 09' (equinox 1950.0). The following magnitude estimates are available (photovisual unless otherwise noted): Apr. 1.77 UT, [12 (Camilleri); 14.54, 9.5 (Camilleri); 16.68, 9.5 (Camilleri); 17.50, 9.5 (P. F. Williams, Heathcote, N.S.W.; visual); 17.52, 9.5 (Camilleri; visual). There is no image visible at this location on Atlas Stellarum (1970 Apr. 6) or the Union Observatory Prints (1921 June 4) to a limiting mag of 14. The new object is about 2' east of a star of mag 10. SUPERNOVA 1993J IN NGC 3031 Further photoelectric photometry (cf. IAUC 5750, 5755) by D. Hanzl, N. Copernicus Planetarium, Brno (H); by B. Kulesza, Olsztyn Observatory, Poland (K); by M. Mikolajewski, K. Ruminski, and M. Staniewski, N. Copernicus University, Torun (M); and by P. Prugniel, Observatoire de Haute Provence (P): Apr. 13.84 UT, V = 11.07 +/- 0.03, B-V = +0.56 +/- 0.06, V-R = +0.50 +/- 0.05, V-I = +0.42 +/- 0.06 (M); 14.00, Bc = 11.70, Bc-Rc = +0.87 (P); 14.89, V = 10.88 +/- 0.04, B-V = +0.56 +/- 0.07 (H); 14.91, V = 10.82 +/- 0.04, B-V = +0.55 +/- 0.03 (K); 14.93, V = 10.94 +/- 0.01, U-B = -0.06 +/- 0.04, B-V = +0.51 +/- 0.02, V-R = +0.48 +/- 0.02, V-I = +0.53 +/- 0.02 (M); 15.08, Bc = 11.65, Bc-Rc = +0.89 (P); 16.00, Bc = 11.62, Bc-Rc = +0.89 (P); 17.00, Bc = 11.63, Bc-Rc = +0.93 (P). Using HD 86677 (cf. IAUC 5742), Hanzl finds V = 11.24 +/- 0.04, B-V = +0.67 +/- 0.03 for GSC 4383.0565. BL LACERTAE The National Astronomical Observatory in Tokyo has forwarded the following report from M. Okyudo, Nishi-Harima Astronomical Observatory: "BL Lac has been highly active since the latter half of 1992, when its magnitude was V about 15. Recent CCD photometric observations (Johnson system): 1993 Apr. 5.77 UT, V = 14.58 +/- 0.05; 14.77, 13.78 +/- 0.02. Comparison stars are 'B' and 'C' of Smith et al. (1985, A.J. 90, 1184), which are in the same field as BL Lac." 1993 April 17 (5765) Daniel W. E. Green
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