Sziasztok!
A CBET 3606. száma szerint az M74-ben feltűnt szupernóva hivatalos
jelölése: SN2013ej.
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SUPERNOVA 2013ej IN M74 = PSN J01364816+1545310
Further to CBET 3588, M. Kim, W. Zheng, W. Li, and A. V. Filippenko,
University of California at Berkeley; and S. B. Cenko, Goddard Space Flight
Center, report the LOSS discovery of an apparent supernova in M74 = NGC 628
on unfiltered KAIT images:
SN 2013 UT R.A. (2000.0) Decl. Mag. Offset
2013ej July 25.45 1 36 48.16 +15 45 31.0 13.5 92".5 E, 135" S
The object was observed again on July 26.44 UT at mag 13.1, having increased
about 0.4 mag in one day, indicating that it may be a young supernova on the
rise. No other KAIT observations were made in the past several months,
prior to July 25. A finding chart is posted at the following website URL:
http://astro.berkeley.edu/~zwk/findingchart/PSN_J01364816+1545310.jpg. The
variable was designated PSN J01364816+1545310 when it was posted at the
Central Bureau´s TOCP webpage and is here designated SN 2013ej based on the
spectroscopic confirmation reported below. M. W. Richmond, Rochester
Institute of Technology, confirms the presence of a bright new transient in
M74 at the above position; CCD images taken with the RIT Observatory´s 30-cm
Schmidt-Cassegrain telescope (+ SBIG ST-8E camera with Bessell filters)
around July 27.21 indicate that the variable is very blue. Additional
magnitudes for 2013ej, via unfiltered CCD unless noted otherwise: July
27.377, 12.8 (A. Amorim, Florianopolis, Brazil, 0.20-m reflector in
moonlight;
visual); 27.7, V = 12.6, R = 13.0 (Ernesto Guido and Nick Howes, remotely
using a 0.43-m f/6.8 astrograph of the ITelescope network at Siding Spring;
position end figures 48s.20, 31".0; UCAC-3 catalogue reference stars; an
animation showing a comparison between their confirmation image and a red
Digitized Sky Survey plate form 1996 is posted at URL
http://bit.ly/1bvi1OS;
their annotated confirmation image is posted at
http://bit.ly/177HYw5);
28.028, 12.8 (Gianluca Masi and Francesca Nocentini, remotely using a 35-cm
robotic telescope at Ceccano, Italy; position end figures 48s.18, 30".9);
28.7, 12.8 (Andrea Mantero, Bernezzo Observatory, Italy; 0.25-m f/4
reflector;
position end figures 48s.01, 31".0; UCAC-4 catalogue reference stars; image
posted at URL
http://www.flickr.com/photos/andreagalaxy/9382629530/).
D. D. Balam, Dominion Astrophysical Observatory, National Research
Council of Canada; M. L. Graham, Las Cumbres Observatory Global Telescope,
University of California at Santa Barbara; and E. Y. Hsiao, Las Campanas
Observatory, report that a spectrogram (range 369-700 nm, resolution 0.3 nm)
of PSN J01364816+1545310 = SN 2013ej, obtained on July 27.41 UT with the
1.82-m Plaskett Telescope of the National Research Council of Canada, shows a
moderately blue continuum with weak Balmer emission lines showing P-Cyg
profiles, suggesting that this is a core-collapse event.
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Jó észlelést!
Fidusz