THE ASTRONOMER Electronic Circular No 738 1993 May 03 10.02UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074 TELEX: 9312111261 Answerback: TA G TELECOM GOLD: 10074:MIK2885 GMH at UK.AC.RUTHERFORD.STARLINK.ASTROPHYSICS STARLINK: RLSAC::GMH GMH at UK.AC.CAM.ASTRONOMY.STARLINK STARLINK: CAVAD::GMH ------------------------------------------------------------------- SUPERNOVA 1993J IN NGC 3031- SEQUENCE D. Hanzl, N. Copernicus Planetarium, Brno, communicates that GSC 4383.0384 appears to be variable, first noted visually on Apr. 16 by K. Hornoch at Lelekovice and J. Kysely at Vlasim, and confirmed photoelectrically by Hanzl as having a maximum at V = 10.98 +/- 0.05, amplitude about 0.35 mag, and period of probably < 1 day. IAUC 5775 Editor: Star D The above suspected variable is star D on the sequence of 'The Astronomer' (assigned magnitude 10.70) and is therefore dropped. If anyone who has submitted estimates involving 'D' also made additional estimates involving other comparisons please e-mail these as soon as possible. This would not only enable us to re-reduce the estimate but also may enable the value of 'D' to be determined for that date and time. Star 1 In addition to assist with reduction of early estimates we have added GSC 4383.150 to our sequence as star 1 with a magnitude value of 10.3. This was used extensively by many groups when the supernova was near maximum. There are two stars of '103' on the Thompson-Bryan chart. The eastern star is 'C' on the TA sequence and the newly-introduced star '1' is on the western edge. On the 'B' format electronic chart issued with E-Circular 722, the coordinates are X=38, Y=57. Latest sequence with other identifications. Please only use the assigned TA values in your reductions. GSC Corwin Sandage ****TA**** GSC TB Skiff V B-V Mag B-V *Star Mag* Mag Mag B-V 4383 * * . 94 9 13.92 0.80 *R 13.92* 13.64 13.9 . 150 *1 10.3 * 9.88 10.3W . 224 11.85 +1.30 *- * 11.18 . 308 11.78 +0.69 *E 11.78* 11.86 11.8 . 322 A5 15.28 1.01 *Q 15.28* 14.87 15.3 . 340 * * 14.59 14.0 14.95 0.16 . 384 VARIABLE *D - * 10.86 10.7 . 434 12.45 +0.63 *G 12.45* 12.00 12.4 12.43 0.44 . 565 * * 12.33 11.42 0.36 . 574 *L 14.10* 14.51 14.1 . 598 A6 14.99 0.69 *N 14.99* 14.59 15.0 . 633 13 13.78 0.58 *K 13.78* 13.31 13.8 . 738 *B 9.40* 8.68 9.4 . 848 *A 8.90* 7.98 8.9 . 860 19 10.32 0.39 *C 10.32* 9.86 10.3 . 863 * * 12.34 12.88 0.56 . 928 11.90 +0.50 *F 11.90* 11.42 11.9 11.93 0.31 . 935 14 12.89 0.73 *H 12.89* 12.38 12.9 .1023 14.73 +0.46 11 14.77 0.44 *M 14.73* 14.37 14.7 .1031 11.62 +0.53 * * 11.17 .1123 13.65 +0.57 *P 13.65* 13.24 13.6 13.64 0.44