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

Joe Patterson jop at astro.columbia.edu
Mon Jun 25 06:02:40 EDT 2012

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!


-------- 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 

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:

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

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!

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