Sziasztok!

Úgy látom, az SN 2011B sokaknak meghozta a kedvét. Itt van egy újabb,
viszonylag fényes szupernóva, az SN 2011aa. A koordinátái alapján az
esti égen szépen fotózható lehet - főleg, ha tovább fényesedik, ugyanis
azt írják, hogy egy Ia típusú szupernóváról van szó, pár nappal (esetleg
egy héttel) maximum előtt. R-ben 15,5 körüli, és talán még jön feljebb is...

Jó észlelést!

* * *

                                                  Electronic Telegram No. 2653
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION

SUPERNOVA 2011aa IN UGC 3906 = PSN J07364263+7426348
     T. Puckett, and J. Newton report the discovery of a supernova (mag 16.1)
on an unfiltered CCD image (limiting mag 19.0) taken with a 0.40-m reflector
at Portal, AZ, U.S.A., on Feb. 6.335 UT in the course of the Puckett
Observatory Supernova Search.  The new object, which was confirmed at mag 16.0
on Feb. 7.076 by Puckett with the same instrumentation at Portal, is located
at R.A. = 7h36m42s.63, Decl. = +74o26´34".8 (equinox 2000.0), which is 20".4
east and 10".2 south of the center of UGC 3906.  Nothing is visible at this
position on images taken by Puckett on Jan. 26 (limiting mag 19.6).  The
object was automatically designated PSN J07364263+7426348 when posted on the
Central Bureau´s TOCP webpage.

     D. D. Balam, D. Bohlender, D. Monin, and E. Chisholm, Dominion
Astrophysical Observatory, National Research Council of Canada; and D. W. E.
Green, CBAT, Harvard University, report that CCD exposures yield the
following R-band magnitudes for PSN J07364263+7426348 = 2011aa from
differential photometry using a nearby star of similar brightness (USNO-A2.0
1575-02747274):  Feb. 8.23 UT, 15.6; 9.24, 15.5.

     Uday K. Gurugubelli, D. K. Sahu, G. C. Anupama, P. Anto, and S. Arora,
Indian Institute of Astrophysics, Bangalore, report that a low-resolution
spectrogram (range 350-930 nm) of PSN J07364263+7426348 = 2011aa, obtained
on Feb. 8.87 UT with the Indian Astronomical Observatory´s 2-m Himalayan
Chandra Telescope (+ HFOSC), shows it to be a type-Ia supernova, a few days
before maximum light.  Using the SNID code of Blondin and Tonry (2007, Ap.J.
666, 1024), the spectrum of 2011aa is found to best match that of SN 1998aq
at about a week before maximum light.  Adopting a recession velocity of 3704
km/s for the host galaxy, UGC 3906 (de Vaucouleurs et al. 1991, Third
Reference Catalogue of Bright Galaxies), the velocity corresponding to the
Si II 635.5-nm absorption line is 13000 km/s.


NOTE: These ´Central Bureau Electronic Telegrams´ are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 February 11                 (CBET 2653)              Daniel W. E. Green


--
Fidusz (FIDRICH Robert)
drotlevel:fidusz@zpok.hu
#jabber/gtalk: fidusz@jabber.hu
#skype: fidusz