------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2895 2013 Feb 23 19.52UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074 INTERNET: GUY@TAHQ.DEMON.CO.UK Backup: gmh@wdcc1.bnsc.rl.ac.uk WORLD WIDE WEB http://www.theastronomer.org ------------------------------------------------------------------- CHELYABINSK SUPERBOLIDE Jiri Borovicka, et. al., Astronomical Institute of the Academy of Sciences, Ondrejov, Czech Republic, report on CBET 3423 that they have computed the atmospheric trajectory and velocity of the superbolide of 2013 Feb. 15.139UT, which caused some damage in the city of Chelyabinsk, Russia. They used 7 video records and the trajectory was assumed to be linear. The geographical coordinates of selected points along the trajectory are: Relative Longitude Latitude Height Velocity Notes Time (s) (deg E) (deg N) (km) (km/s) 0.00 64.266 54.508 91.83 17.5 beginning 9.18 61.913 54.788 41.02 17.5 minor flare 11.20 61.455 54.836 31.73 17.5 major flare 12.36 61.159 54.867 25.81 17.5 flare 13.20 60.920 54.891 21.05 12.5 minor flare 16.20 60.606 54.922 14.94 4.3 end The observed trajectory was 254 km long. The mass of the largest fragment, which landed in the lake Chebarkul, was estimated to be 200-500 kg. SUPERNOVA 2013A IN UGC 1825 (GAGLIANO) 2013A Jan 3.14 02 22 04.26 +32 13 57.8 17.6 5.7"E 7.7"S G. H. Marion: spectrum Jan 4 type-Ia a few days after maximum SUPERNOVA 2013B IN ESO 60-26 (PARKER) 2013B Jan 3.51 09 04 00.80 -72 03 24.8 17.2R 1 "E 9 "S F. Taddia: spectrum Jan 5 type-Ia close to maximum SUPERNOVA 2013C IN PGC 33561 (TSUBOI) 2013C Jan 4.77 11 05 55.22 +72 31 20.3 16.5 5.1"W 11.4"S K. Ayani: spectrum jan 5 type-Ia around maximum SUPERNOVA 2013D (MASTER) 2013D Jan 3.82 03 41 15.13 +15 23 03.9 17.5 The discovery was by Pavel Balanutsa via the MASTER-Kislovodsk auto-detection system G. H. Marion: spectrum Jan 6 type-Ia a few days after maximum A good fit is found to the template of the subluminous, 1991bg-like type-Ia supernova 1997cn at four days after maximum. SUPERNOVA 2013E IN IC 2532 (PARKER) 2013E Jan 4.58 10 00 05.52 -34 14 01.3 14.8R 2 "E 19 "S An image can be seen at: http://tinyurl.com/bf629tb N. Morrell: spectrum Jan 6 type-Ia several days before maximum SUPERNOVA 2013F IN IC 5325 (SIDING SPRING SURVEY) 2013F Jan 5.45 23 28 45.03 -41 19 56.2 17.1 18.0"E 4.3"N Nothing is visible at this position on an SSS image from 2012 Nov. 20.51 UT (limiting mag 19.2) J. L. Prieto: spectrum Jan 8 young type-Ib/c Guy M Hurst