Circular No. 5774

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 W. H. Allen, Carter Observatory, reports the following Johnson pho-

toelectric observations made with the 0.32-m telescope at the Adams Lane Observatory (comparison stars HD 157792, HR 6486): Apr. 19.72 UT, V = 9.97, B–V = +1.03, U–B = –0.10; 20.63, 9.83, +1.09, –0.07; 21.71, 9.75, +1.05, –0.22. Visual magnitude estimates by A. F. Jones, Nelson, New Zealand: Apr. 19.68 UT, 9.4; 21.45, 9.6; 22.70, 9.7; 23.64, 9.6.

SUPERNOVA 1993J IN NGC 3031 Further Johnson photometry (cf. IAUC 5750, etc.) by M. Dumont,

A. Manda, J. Remis, J. Vandenbroere, Jungfraujoch Observatory, Switzerland (D; 0.76-m telescope; communicated by M. Grenon); by B. Kulesza, Olsztyn Observatory, Poland (K); by M. Mikołajewski, K. Rumiński, M. Golebiewski, and B. Wikierski, N. Copernicus University, Toruń (M); and by Z.-Y. Zheng, X. Zhou, and H. Wu, Xing-Long station, Beijing Astronomical Observatory (Z; 0.6-m Schmidt telescope + CCD; Landolt standard comparison stars; errors about ± 0.03 mag): Apr. 7.57 UT, V = 11.71, U–B = –0.51, B–V = +0.24, V–R = –1.10, V–I = –1.16 (Z); 9.60, 11.49, –0.43, +0.36, –1.11, –1.19 (Z); 10.57, 11.45, –0.31, +0.25, –1.05, –1.11 (Z); 11.58, 11.22, –0.37, +0.39, –1.14, –1.32 (Z); 12.63, 11.13, –0.31, +0.37, –1.15, −1.21 (Z); 13.60, 11.08, –0.34, +0.32, –1.15, –1.24 (Z); 14.62, 10.99, –0.32, +0.34, –1.22, –1.21 (Z); 15.59, 10.99, –0.25, +0.28, –1.10, –1.18 (Z); 16.017, 10.85 ± 0.04, –, +0.54 ± 0.03, –, – (D); 16.53, 10.92, –0.34, +0.37, –1.12, –1.19 (Z); 16.976, 10.88 ± 0.04, –, +0.54 ± 0.03, –, – (D); 17.55, 10.84, –0.27, +0.43, –1.14, –1.28 (Z); 18.56, 10.86, –0.23, +0.46, –1.17, –1.24 (Z); 19.047, 10.84 ± 0.02, –, +0.62 ± 0.03, –, – (D); 19.57, 10.89, –0.13, +0.53, –1.15, –1.20 (Z); 19.986, 10.82 ± 0.02, –, +0.64 ± 0.03, –, – (D); 20.55, 10.97, –0.13, +0.56, –1.09, –1.16 (Z); 20.91, 10.89 ± 0.01, +0.04, +0.73, +0.62, +0.57 (M); 20.91, 10.79, –, +0.75, –, – (K); 21.55, 11.07, –0.10, +0.60, –1.04, –1.13 (Z); 22.02, 10.95 ± 0.03, +0.17, +0.80, +0.62, +0.70 (M); 22.88, 11.09 ± 0.01, +0.49:, +0.89, +0.75, +0.62 (M); 23.55, 11.12, –0.12, +0.81, –1.04, –1.13 (Z). Further Cousins photometry by P. Prugniel, Observatoire de Haute Provence: Apr. 22.00, V = 11.01, B–V = +0.86, V–R = +0.40, V –I = +0.52; 23.00, 11.09, +0.87, +0.42, +0.55; 24.00, 11.16, +0.93, +0.43, +0.57.

1993 April 24 Daniel W. E. Green