RA 13h 29m 53.37z DEC +47 10'28.2" (2000), 15" W and 78" S of the host galaxy's centre.
Wolfgang Kloehr, Schweinfurt, Germany, reports his discovery of a mag 14 apparent supernova in Messier 51 (NGC 5194). It was recorded on CCD frames of June 28.91 and 28.93UT using a 0.20-m reflector. It may also have been present on June 27.93UT near mag 16. A KAIT image obtained on June 30.25UT confirms the presence of the new object at about mag 13.5 with end figures: RA 52.8s DEC 36.3"
Hitoshi Yamaoka, Japan adds: SN 2005cs is located on the southern arm of "Whirlpool Galaxy" M 51. On the pre-discovery image, there is a bright star cluster and H II region. It is possibly a gravitational-collapse of a massive star, but the prompt spectral classification is urgently needed, as well as follow-up photometry.
Guy Hurst reports in The Astronomer E-circular E2124 the discovery by Wolfgang Kloehr, in Germany of a 14th magnitude supernovae in M51 on June 28.91. Further CCD images by Richard Miles from Golden Hill Observatory shows a V mag of V=14.53 on 2005 June 30.993 showing the object may well be fading already. In addition, Maurice Gavin has captured a spectrum which can be viewed [ herewith at June 30.965UT]. See wpo spectrum SN2005cf in MCG-1-39-3 [Libra]
Spectrogram of SN 2005cs (cf. IAUC 8553), obtained June 30.23 UT with Whipple Ob 1.5-m + FAST, shows a young type-II supernova with blue continuum and P-Cyg profiles of Balmer and He lines. Assuming recessional velocity of 600 km/s for host galaxy the expansion velocity = ~7500 km/s.
main spectro page wpo spectrum SN2005cf in MCG-1-39-3 [Libra]
2005 June 30: Preliminary wpo spectrum of SN2005cs is inconclusive as to type eg currently no strong Ha emission [type II] or deep absorption band ~610nm for SiII [type Ia] although the type Ia seems probable [but wrong!-see above IAUC 8553]. The weak spectral lines may develop.
images & text [c] Maurice Gavin - 2005