------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2749 2011 Jly 08 14.02UT 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 ------------------------------------------------------------------- DWARF NOVA IN PEGASUS (PNV J21095047+1348396) K. Itagaki (Yamagata, Japan) reports on CBET 2731 the discovery a possible nova on 2011 May 24.672 UT during a survey program performed by himself and H. Kaneda (Hokkaido, Japan). The variable was confirmed at unfiltered CCD mag about 11.5 by Itagaki with a 0.60-m reflector on May 24.699, at: RA 21h09m50s.47 DEC +13 48' 39.6"(2000); a confirmation image has been posted at: http://www.k-itagaki.jp/images/pnv.jpg. Additional approximate magnitudes: May 17.71, [14.9 (Itagaki, 0.21-m reflector); May 18.76, [12.3 (Itagaki, 180-mm-f.l. telephoto lens); May 25.3, 11.0 (Ernesto Guido and Giovanni Sostero; remotely with a 0.25-m f/3.4 reflector at the GRAS Observatory near Mayhill, NM, U.S.A.; position end figures 50s.46, 39".6, which they also note to be very close to a star of red mag 18.8 in the USNO- B1.0 catalogue; their image compared to a red Digitised Sky Survey plate from 1991 is posted at website URL http://bit.ly/mycwOt); May 25.676, 11.6 (K. Kadota, Ageo, Japan; 0.25-m f/5 reflector + SBIG ST-9E camera; position end figures 50s.47, 39".7; communicated by S. Nakano, Sumoto, Japan; image posted at URL http://members.jcom.home.ne.jp/kenic-k/image/PNVinPeg-20110525.jpg); May 26.076, 11.5 (P. Schmeer, Bischmisheim, Germany; visual). Itagaki/Yamaoka note also that a faint star (mag about 19) is located within several arcsec of Itagaki's position in the USNO-B1.0 catalogue (position end figures 50s.427, 39".95). Akira Arai, Kyoto Sangyo University, relay that optical low-dispersion spectroscopic observations were made on May 25.67 UT using the 1.3-m Araki telescope (+ LOSA/F2). The spectrum shows a blue continuum with H_beta and H_gamma absorptions and no significant blue-shifts. No obvious line is visible at H_alpha. These suggest that an emission component of H_alpha could be filling in the absorption line and that the object is a dwarf nova in outburst. Their spectrum has been posted at website URL http://www.cc.kyoto-su.ac.jp/~kao/blog/index.php/view/94. Dave Balam, Dominion Astrophysical Observatory, National Research Council of Canada (NRCC); M. L. Graham, Las Cumbres Observatory Global Telescope, University of California at Santa Barbara; E. Y. Hsiao, Lawrence Berkeley Laboratory; and D. W. E. Green, Harvard University, report that a spectrogram (range 382-714 nm, resolution 0.3 nm) obtained on May 29.42 UT with the 1.82-m Plaskett Telescope of the NRCC, shows a steep blue continuum with broad asymmetric Balmer absorption lines. H-alpha exhibits a broad absorption profile with a sharp (1.2-nm FWHM) central emission spike. SUPERNOVA 2011cb IN PGC 69707 = PSN J22470700-6449430 (PARKER) 2011cb Apr 29.68 22 47 07.00 -64 49 43.0 14.9 8 "E, 7 "N M. Stritzinger, Oskar Klein Centre, Stockholm University et. al., report on spectra of May 1.3 and 2.3 UT by B. Madore which show that it is a type-IIb supernova. SUPERNOVA 2011cc IN IC 4612 = PSN J16334944+3915487 (LOSS) 2011cc Mar 17.52 16 33 49.44 +39 15 48.7 17.7 2.3"W, 0.9"N A. V. Filippenko and J. M. Silverman, University of California, Berkeley, report that inspection of a CCD spectrum of May 2UT with the 3-m Shane reflector show it is a type-IIn supernova. Guy M Hurst