THE ASTRONOMER Electronic Circular No 703 1993 Jan 24 17.00UT 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 ------------------------------------------------------------------- SUPERNOVAE 1993A AND 1993B IN ANONYMOUS GALAXIES J. Maza, University of Chile (UC); and M. Hamuy, Cerro Tololo Interamerican Observatory, report the discovery of two supernovae on 20-min IIa-O exposures taken by G. Valladares with the CTIO Curtis Schmidt telescope. SN 1993A, at mpg about 18.5 on Jan. 17.17 UT, was discovered by M. Wischnjewsky (UC) and is located 5".5 west and 3".5 south of the nucleus of a galaxy at R.A. = 7h38m38s.4, Decl. = -61 56'11" (equinox 1950.0); the supernova was not visible (mpg > 20) on a IIIa-J plate taken on 1992 Dec. 29. Confirmation of SN 1993A was made by C. Anguita (UC) with a CCD V image obtained on Jan. 20.24 with the CTIO 1.5-m telescope. SN 1993B, at mpg about 18 on Jan. 17.22, was discovered by R.Antezana (UC) and is located about 1" east and 5" north of the nucleus of a spiral galaxy at R.A. = 10h32m35s.1, Decl. = -34 11'03"; SN 1993B was not visible (mpg > 19) on a IIa-O plate taken on 1992 Dec. 27. Anguita also confirmed SN 1993B on CCD B and V frames obtained on Jan. 20.30. IAUC 5693 TA PRODUCTION I am grateful for the considerable number of replies received to the appeal in E702 for your thoughts on the future production of TA. Although, quite naturally, astrophotogaphers expressed concern at the possible quality change which may be caused by the introduction of photocopying to the covers, the vast majority felt that the improvement in speed of production was far more important. The additional benefit of one company carrying out all printing and collation will clearly ease the burden here at TA HQ. Therefore, with immediate effect, the cover deadline will now be the same as the observational reports i.e.5th of month of issue. The February cover deadline is therefore deferred until Feb 5. If anyone obtains interesting photographs before this date it would be useful for these to be sent in promptly to 'test out' the new arrangements. We also plan to introduce spine-stapling to improve the general appearance of the magazine. Longer term it is hoped to invest in a higher quality printer so that clearer masters can be produced for the printing company to work on. COMET MUELLER (1993a) Improved Orbital elements: T 1994 Jan 13.3034 TT w 130.72760 ) e 1.00000000 O 144.71070 ) 2000.0 q 1.9371180 A.U. i 124.86700 ) Source: IAUC 5694 Positions are geocentric m = 5.0 + 5.0 log R + 10.0 log r Date R.A. (2000) Dec. R r Elong Mag. Motion h m o ' (AU) (AU) o "/hr P.A. 1993 Jan 23.00 9 15.25 +52 23.6 3.549 4.395 145.5 14.2 57 309 28.00 9 5.14 +53 32.5 3.513 4.352 144.4 14.1 57 305 1993 Feb 2.00 8 54.23 +54 34.8 3.487 4.309 142.2 14.1 57 301 7.00 8 42.68 +55 29.5 3.470 4.265 139.1 14.0 56 297 12.00 8 30.70 +56 15.5 3.463 4.222 135.3 14.0 55 292 17.00 8 18.51 +56 52.6 3.464 4.178 130.9 13.9 53 288 22.00 8 6.40 +57 20.5 3.472 4.134 126.2 13.9 50 284 27.00 7 54.61 +57 39.5 3.488 4.091 121.3 13.8 47 279 Guy M Hurst