Circular No. 5558 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) GK PERSEI J. A. Mattei, AAVSO, reports that GK Per has brightened significantly for the first time in about 3 years. Selected visual magnitude estimates: 1991 Sept. 8.92 UT, 13.0 (A. Boattini, Florence, Italy); 1992 Jan. 29.96, 13.1 (B. H. Granslo, Fjellhamar, Norway); Feb. 7.82, 13.2 (P. Schmeer, Bischmisheim, Germany); July 3.31, 12.3 (J. Bortle, Stormville, NY); 4.38, 12.3 (M. Adams, Melbourne, FL); 5.38, 12.1 (Adams); 6.38, 11.8 (Adams). SUPERNOVA 1992ae IN ANONYMOUS GALAXY M. Della Valle, European Southern Observatory; and A. Bianchini, Department of Astronomy, University of Padua, report: "Preliminary analysis of a spectrogram (range 380-840 nm, resolution about 2 nm), obtained with the 1.52-m telescope at La Silla on July 5.4 UT, shows SN 1992ae (cf. IAUC 5554) to be a type-I supernova. The expansion velocity deduced from the minimum of the Si II 635-nm absorption is about 7500 km/s. The spectrum bears a strong similarity to that of SN 1990N (Leibundgut et al. 1991, Ap.J. 371, L23), which might suggest a pre-maximum type Ia supernova. The H- alpha emission of the galaxy gives a redshift of z about 0.07." SUPERNOVA 1992af IN 340-G38 Della Valle and Bianchini also communicate: "Inspection of a spectrogram, obtained as described above on July 5.3 UT under nonphotometric conditions, shows SN 1992af (cf. IAUC 5554) to be a type-II supernova. The spectrum is dominated by the emission of H- alpha and H-beta coupled with a P-Cyg profile. The expansion velocity corresponding to the difference between the rest wavelength in the galaxy's frame and the minimum of the absorption is about 8500 km/s. Assuming the H-alpha emission line at the rest wavelength in the galaxy's frame, a redshift of z about 0.02 was estimated from the same spectrum." NOVA SCORPII 1992 W. H. Allen, Carter Observatory, forwards additional photometric measurements obtained at Adams Lane Observatory (cf. IAUC 5536, 5550, etc.): June 26.37 UT, V = 8.03, B-V = +1.06, U-B = +0.05; 30.37, 8.03, +1.00, -0.05; July 1.30, 7.77, +1.01, -0.03; 6.33, 9.34, +0.82, -0.14. 1992 July 6 (5558) Daniel W. E. Green
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