------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2578 2009 Aug 30 16.33UT 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 ------------------------------------------------------------------- SUPERNOVA 2009io IN UGC 11666 On 2009 August 29, Tom Boles, Coddenham, advised his discovery of an apparent supernova in the galaxy UGC 11666 during the course of searches for the UK Nova/Supernova Patrol. The object, of magnitude 18.9, was first noted on an unfiltered CCD image of Aug 13.932UT and confirmed on 29.032UT using a 0.35-m Schmidt-Cassegrain telescope. The new object is located at: RA 21h 02m 15.09s DEC +15 08' 29.8" (2000), 2.2"W, 20.0"N from the centre of the host galaxy. Nothing is present at this position on Tom's images of 2007 Oct 6 and 2008 Aug 04 (limiting mag 19.5) nor on Digitised Sky Survey Plates from 1991-07-16 (limiting red mag 21.0), and 1992-10-16 (limiting blue mag 20.5). The designation of SN 2009io was assigned on CBET 1927. Congratulations to Tom on the discovery of his 125th supernova. PN G75.5+1.7 According to CBET 1876 last July, D. M. Jurasevich, Mount Wilson Observatory, discovered and reported that H-alpha CCD images taken on 2007 June 19.22 and 2008 July 6.17 UT, using an Astro-Physics 160EDF apochromatic refractor reveal a near-spherical shell of gas, located within a faint H II region near NGC 6888, that was apparently not noticed previously due to the density of stars and gas in that area of Cygnus. This shell appears as a slightly elongated ellipse with its major axis at p.a. 5 deg and having an apparent size of 260" x 235"; its centre is located at: RA 20h 15m 22.2s DEC +38 02' 58" (2000). http://tinyurl.com/ku4ppy. L. Kohoutek, University of Hamburg, writes that he can see PN G75.5+1.7 on both red and blue "transparencies" of the second Palomar Sky Survey (but not on the first POSS photographs), noting that the nebula is extremely faint there (only a trace), but having the same size as on the current images. Also, the blue star in the centre is of similar brightness at all epochs; this does not support a nova nebula, as the nebula has not changed in about sixteen years. SUPERNOVA 2009ih IN MCG +07-33-12 Further to the discovery by Tom Boles noted on TA E-Circular 2575, J. M. Silverman et. al., University of California, Berkeley, report on CBET 1930 that inspection of a CCD spectrum obtained on Aug. 28 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows it is a type-Ia supernova similar to the subluminous supernova 1991bg. After removing the host-galaxy recession velocity (9858 km/s; Falco, et al. 1999, Ap.J. 560, 566), the absorption minimum of the Si II 635.5-nm feature is found to be blueshifted by about 10500 km/s. Cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that it is about five days past maximum light. SUPERNOVA 2009hj IN NGC 7372 Discovery by LOSS of a possible supernova (CBET 1873): SN 2009 UT R.A. (2000.0) Decl. Mag. Offset 2009hj Jun 26.47 22 45 46.08 +11 07 58.3 19.1 1.1"E, 6.2"N SUPERNOVA 2009hk IN MCG -04-48-26 Discovery by ROTSE of a possible supernova (CBET 1875): SN 2009 UT R.A. (2000.0) Decl. Mag. Offset 2009hk Jly 11.90 20 38 37.42 -25 06 56.0 17.0: 26 "W,33 "N Guy M Hurst