[vsnet-alert 16627] MASTER OT J095018.04-063921.9 (ATEL)

[Taichi Kato]

==============================================================================
ATEL #5587							     ATEL #5587

Title:	Bright large-amplitude CV discovered by MASTER
Author:	A. Rufanov, D. Denisenko, E. Gorbovskoy, V. Lipunov, N. Tiurina,
		P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A.
		Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University,
		SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk
		Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev,
		E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State
		University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich
		(Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih,
		A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V.
		Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE),
		C. Mallamaci, C. Lopez, F. Podest (OAFA)
Queries:	lipunov2007 at gmail.com
Posted:	17 Nov 2013; 16:04 UT
Subjects:Optical, Cataclysmic Variable, Transient

MASTER OT J095018.04-063921.9 - new bright large-amplitude CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec)
= 09h 50m 18.04s -06d 39m 21.9s on 2013-11-17.00834 UT. The OT unfiltered
magnitude is 
14.1m
(limit 17.4m). The OT is seen in 9 images. There is no minor planet at
this place. We have reference image without OT on 2010-11-04.10560 UT with
unfiltered magnitude limit 19.5m. 

The OT at quiescence is identical to the faint blue star USNO-B1.0 0833-0227098

(09 50 18.137 -06 39 21.96 B1=20.07 R1=19.51 B2=20.89 R2=20.08). Color-combined
finder chart is uploaded to http://master.sai.msu.ru/static/OT/J095018-063921-JRIR.jpg
(10'x10' FOV). There is also an UV counterpart <a href="http://galex.stsci.edu/GR6/?page=explore&photo=true&objid=6381998908933932340">GALEX
J095018.1-063921</a> (FUV=21.49+/-0.27, NUV=20.90+/-0.18). There is nothing
at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in
Sextans is not covered by SDSS. 

The position of the OT was observed by <a href="http://skyview.gsfc.nasa.gov/skymorph/skymorph.html">NEAT</a>
project with 74 images obtained on 28 different nights from 2000 Mar. 07
to 2004 Apr. 06. The object was at quiescence on all images. No outbursts
were detected by <a href="http://nesssi.cacr.caltech.edu/DataRelease/">Catalina
Real-Time Transient Survey</a>. 

Based on the blue color, UV counterpart and amplitude of variability (at
least 6m) we conclude that MASTER OT J095018.04-063921.9 is a new cataclysmic
variable of SU UMa (UGSU) type in superoutburst. Follow up observations
are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/095018.04-063921.9.png

<center><a href="http://observ.pereplet.ru/MASTER_OT.html">List of Optical
Transients discovered by MASTER</a></center>