------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2928 2013 Jly 12 18.44UT 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 ------------------------------------------------------------------- NEW NAMES OF SATELLITES OF (134340) PLUTO Further to IAUC 8723, the IAU's Working Group for Planetary System Nomenclature and the Working Group on Small-Body Nomenclature (formerly the Committee on Small-Body Nomenclature) have jointly approved the following names for new satellites of Pluto: Designation and Name Provisional Designation Reference Pluto IV Kerberos = S/2011 (134340) 1 IAUC 9221 Pluto V Styx = S/2012 (134340) 1 IAUC 9253 Editor: A fuller discussion about the naming procedure from an IAU News Bulletin appears in the July issue of 'The Astronomer'. SUPERNOVA 2013cn IN UGC 11076 (CATALINA REAL-TIME TRANSIENT) 2013cn May 10.39 17 58 50.34 +34 00 16.6 19.5 17.8"W 4.7"S C. McCully: spectrum May 11 Keck II 10-m telescope shows it to be type-II a few months after maximum. SUPERNOVA 2013co (TIANMENG ZHANG & XIAOFENG WANG) 2013co May 6.54 12 55 50.51 +30 30 41.5 17.7 0.5"E 0.3"N J. M. Silverman: spectrum May 13 with 9.2-m Hobby-Eberly luminous type-Ic, possibly of the broad-lined subtype a few days after maximum. The absolute magnitude is -19.0 comparable with GRB/SN 1998bw. SUPERNOVA 2013cp (THU-NAOC TRANSIENT SURVEY) 2013cp May 7.69 16 19 52.22 +38 56 07.9 18.5 11.0"E 1.0"S J. M. Silverman: spectrum May 11 with 9.2-m Hobby-Eberly normal type-Ia a week after maximum. The Si II 635.5-nm line indicated blue-shifted by about 10800 km/s. SUPERNOVA 2013cr (THU-NAOC TRANSIENT SURVEY) 2013cr May 14.75 16 11 46.47 +40 51 22.2 17.5 2.0"W 3.0"N J. M. Silverman: spectrum May 16 with 9.2-m Hobby-Eberly type-IIP supernova about two weeks after maximum. SUPERNOVA 2013cs IN ESO 576-17 (CATALINA REAL-TIME TRANSIENT) 2013cs May 14.59 13 15 14.81 -17 57 55.6 14.7 28.7"E 4.8"N M. Yamanaka: spectrum May 15 type-Ia 10 days before B-band maximum. SUPERNOVA 2013ct IN NGC 428 (STUART PARKER) 2013ct May 10.77 01 12 54.92 _00 58 45.7 12.2r 11 "W 8 "N An image by Parker appears at http://tinyurl.com/d9xo4ol. E. Y. Hsiao, Las Campanas Observatory: spectrum May 22 6,5-m Magellan Baade Telescope suggests type-Ia 2-3 weeks past maximum SUPERNOVA 2013cu IN UGC 9379 (MASTER-KISLOVODSK) 2013cu May 5.92 14 33 58.97 +40 14 20.7 15.7 4 "E 20 "S L. Tomasella: spectrum May 8 suggests a very young core-collapse supernova. SUPERNOVA 2013cv (LI ZHOU ET. AL.) 2013cy May 20.75 16 22 43.16 +18 57 35.6 16.5 2.4"E 1.6"N Xulin Zhao: spectrum May 31 type-Ia 2-3 weeks after maximum. Dave Balam, Dominion Astrophysical Observatory, reports that a spectrogram obtained on June 3.42 UT with the 1.82-m Plaskett Telescope of the National Research Council of Canada, shows it to be a type-Ia supernova at three months past maximum light. Guy M Hurst