(cba:news) Fwd: [vsnet-alert 14697] New bright CV in Vulpecula by MASTER

[Joe Patterson]

Dear CBAers,

Really nice candidate large-amplitude dwarf nova in this announcement. 
Vulpecula is definitely overdue for giving us a highly interesting CV. 
None since 1976 (NQ Vul), and this is a step in the right direction. 
 From this report, seems very unlikely to be one of the standard CV 
imitators: flare star, asteroid, extragalactic.  As Denis says, get thee 
to a telescope and start observing!

joe

-------- Original Message --------
Subject: [vsnet-alert 14697] New bright CV in Vulpecula by MASTER
Date: Mon, 25 Jun 2012 13:50:20 +0400
From: Denis Denisenko <d.v.denisenko at gmail.com>
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp

We have discovered a new bright CV in Vulpecula on the survey images
from MASTER-Kislovodsk robotic telescope taken last night (about 13
hours ago). Astronomer's Telegram will be published soon at
http://www.astronomerstelegram.org/ (should be ATel 4207). Meanwhile I
am reporting the coordinates and finder charts so that people can
start observing right now. Outburst amplitude is about 7m, so this one
might be a new UGWZ variable.

MASTER OT J211258.65+242145.4 = USNO-B1.0 1143-0518038 = GALEX 
J211258.7+242145

Unfiltered magnitudes from the discovery images:

2012-06-24 20:03:36 UT 12.85
2012-06-24 20:37:29 UT 12.94
2012-06-24 21:12:04 UT 12.90

Discovery and reference images:
http://master.sai.msu.ru/static/OT/MASTER211258.65+242145.4.jpg

There is a faint blue star on Palomar plates and in USNO-B1 catalog
(B1=19.73, R1=20.03, B2=20.78, R2=20.39) with the proper motion (12,
-4) mas/year. GALEX UV magnitudes are FUV=19.91, NUV=20.06. No
prevoius outbursts were found on DSS plates and NEAT images. This area
is not covered by SDSS and CRTS.

10'x10' color-combined (BRIR) DSS finder chart is uploaded to
http://master.sai.msu.ru/static/OT/J211258.65+242145.4-BRIR10x10.jpg

Denis Denisenko

P.S. This is the first optical transient discovered by myself from the
MASTER images after cheking several hundred candidates in 2.5 months,
and such a bright one!