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THE ASTRONOMER Electronic Circular No 2863      2012 Oct 22 12.39UT
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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PNV J18523496-0018423
Further to the discovery note on TA E-Circular 2862, Martin Mobberley 
reports he has measured the possible nova using an AAVSO chart reference 
9502DX and associated photometry table. Using
reference stars labelled 11.8, 12.5, 12.9, 14.1 and 14.9 without 
transformation co-efficients the internal consistency is within 0.1 mags 
for all the ref stars except the 14.1 which shows a much bigger error in 
both V and Rc. Ignoring the 14.1 star and using those either side of the 
possible nova (14.9 & 12.5) the following unfiltered mags were obtained:

2012 Oct 21.778 UT mag 13.9 V & mag 13.5 Rc

Martin adds that it is quite obvious on an image of the nova by Denis 
Buczynski it was much brighter, despite just 15 minutes between the two 
images! This is confirmed in Martin's measurement, using the AIP4Win 
photometry tool.

Editor: It is therefore possible rapid fluctuations are taking place and 
frequent monitoring is needed.

MASTER OT J081110.46+660008.5
Denis Denisenko, Moscow State University and others report on 'The 
Astronomer's Telegram 4506' that the MASTER-Amur auto-detection system 
has discovered an Optical Transient source at:
2012-10-20.792UT  RA 08h 11m 10.46s DEC +66d 00' 08.5" (2000)
The OT, seen on two images, is of unfiltered magnitude 14.1m (limit 
18.9m). A reference image without the OT on 2011-10-07.76701 UT has an 
unfiltered magnitude limit 18.5m.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/081110.46660008.5.png

The OT is identical to the star in SDSS with the following magnitudes: 
u=22.42 g=22.07 r=22.11 i=22.16 z=22.26. The star is showing variability 
on blue Palomar plates. According to USNO-B1.0, it had B=18.98 on 
1955-01-28 POSS-I plate and B=20.51 on 1997-02-05 POSS-II plate. Nothing 
is present at this position in GCVS and AAVSO VSX. No previous outbursts 
were detected by Catalina Sky Survey. This area was not covered by NEAT.

Based on the outburst amplitude and blue colour (SDSS g-r=-0.04,
r-i=-0.05) they conclude that MASTER OT J081110.46+660008.5 is a new 
cataclysmic variable, most likely a dwarf nova of WZ Sge (UGWZ) type.

SUPERNOVA 2012er IN PGC 60437 (MASTER-AMUR)
2012er  Aug 21.56   17 31 52.66  +71 50 12.0  16.0  14.7"W   13.8"S
M. Turatto: spectrum Aug 21 normal type-Ia supernova similar to SN 1989B 
six days after B-band maximum.

Guy M Hurst