Circular No. 5379 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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN SUPERNOVA 1991bd IN UGC 2936 A. V. Filippenko and T. Matheson, University of California, Berkeley, communicate: "A CCD spectrum (range 390-710 nm, resolu- tion 1 nm), obtained on Oct. 31 UT with the Shane 3-m reflector at Lick Observatory, confirms that SN 1991bd is of type Ia (cf. IAUC 5367) rather than type II (cf. IAUC 5370)." R CORONAE BOREALIS Photoelectric measurements by D. Bohme, Nessa, Germany: Oct. 4.79 UT, V = 5.73, B-V = +0.57; 7.77, 5.77, +0.53; 10.75, 5.85, +0.55; 14.81, 5.86, -; 26.75, 6.05, +0.72; 27.75, 6.08, +0.69; 28.75, 6.14, +0.66. Visual magnitude estimates (cf. IAUC 5059): Aug. 19.88, 6.0 (A. Pereira, Cabo da Roca, Portugal); Sept. 26.83, 6.0 (Pereira); Oct. 12.84, 6.0 (Pereira); 27.06, 6.0 (D. York, Abiquiu, NM); Nov. 2.06, 6.2 (York); 5.06, 6.5 (York). COMET SHOEMAKER-LEVY (1991d) Ephemeris from orbital elements on MPC 18256: 1991 ET R.A. (1950) Decl. Delta r m1 Oct. 31 13 11.83 +34 07.3 2.879 2.370 12.0 Nov. 10 13 41.27 +35 06.4 20 14 12.98 +36 07.7 2.662 2.313 11.8 30 14 46.88 +37 08.1 Dec. 10 15 22.62 +38 03.9 2.508 2.278 11.6 20 15 59.59 +38 51.5 30 16 36.94 +39 28.0 2.439 2.265 11.5 Total visual magnitude estimates: Nov. 5.52 UT, 12.3 (A. Hale, Las Cruces, NM, 0.41-m reflector); 6.55, 11.5: (D. Machholz, 0.25-m reflector, Colfax, CA). V1251 CYGNI T. Kato, Kyoto University, reports: "CCD photometry with the Ouda 0.6-m reflector revealed superhumps at Nov. 3.448, 3.524, and 3.600 UT (amplitude 0.25-0.35 magnitude in V). The amplitude was only 0.05 magnitude on Oct. 28. The development of superhumps was very slow for an SU UMa-type star." 1991 November 6 Daniel W. E. Green