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THE ASTRONOMER Electronic Circular No 2803      2012 Feb 24 14.48UT
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
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SUPERNOVA 2011HT IN UGC 5460
On TA E-Circular 2770 Tom Boles announced his discovery of a possible 
supernova in UGC 5460 recorded at magnitude 17.0 on 2011 Sept 29. Andrea 
Pastorello reported that a spectrum on Sept 30 suggested it was a LBV 
and the object was designated
PSN J10081059+5150570.

To date 37 magnitude estimates/measures have been received showing the 
object brightened substantially after discovery with a maximum of about 
magnitude 14.1 on 2011 Nov 22. The absolute magnitude of
-17 was too bright for a LBV and it was renamed supernova 2011ht.
(See also TA E-Circular 2782).

On 2012 February 11, Guy Hurst obtained an image with the Bradford 
Robotic Telescope showing it near magnitude 18.1 after the previous 
result on Feb 1 was 15.4. Martin Mobberley imaged it on Feb 24 and 
astrometry confirmed it to be the object found by Tom Boles in September 
last year. This may be due to a dust event but it would be worth 
monitoring in case of a re-brightening.

SUPERNOVA 2012aa (LOSS)
2012aa  Jan 29.56   14 52 33.48  -03 31 54.0  17.7   0.1"E,   1.6"S
J. M. Silverman: spectrum Feb 2 probable type Ic.

SUPERNOVA 2012ab (ROTSE)
2012ab  Jan 31.35   12 22 47.6   +05 36 25.0  15.8
The object is at the core of SDSS J122247.61+053624.2.
A Hobby-Eberly spectrum of Feb 7 and a second on Feb 16 indicates 
type-IIn with no obvious match to libraries of spectra.

SUPERNOVA 2012ac (CSS)
2012ac  Feb 11.16   03 34 33.42  +18 04 40.3  18.6   1.9"W,   2.1"N
L. Tomasella: spectrum Feb 18 type-Ia similar to SN 1998bu 10 days after 
maximum

SUPERNOVA 2012ad (CSS)
2012ad  Jan 26.30   06 38 45.07  +67 20 22.4  17.9
L. Tomasella: spectrum Feb 18 type-Ia about two weeks after max

SUPERNOVA 2012ae (KRYACHKO, KOROTKIY, SATOVSKIY)
2012ae  Feb 13.76   08 58 55.88  +23 03 42.4  18.4   3.2"W,   1.3"N
Takahashi FRC-300 telescope at Karachay-Cherkessia, Russia.
L. Tomasella: spectrum Feb 18 type-Ia around maximum

SUPERNOVA 2012af (MASTER ROBOTIC NET)
2012af  Feb 11.99   15 00 30.87  +23 55 45.1  16.7   9.2"E,   0.7"S
G. H. Marion: spectrum Feb 19 type-Ia soon after maximum

SUPERNOVA 2012ag IN PGC 48454 (SIDING SPRING)
2012ag  Feb 16.74   13 41 27.66  -32 00 01.0  16.6   8.1"E,   8.1"N
G. H. Marion: spectrum Feb 19 type-Ia more than three weeks after 
maximum and similar ro SN 2003cg

Guy M Hurst