[vsnet-alert 19526] NSV 4168 = MASTER OT J084140.94+722732.6

[Taichi Kato]

NSV 4168 = MASTER OT J084140.94+722732.6

   Very likely an SU UMa-type dwarf nova.
Time-resolved photometry is encouraged.
NSV range: 11-(16p

=Ross 166
http://adsabs.harvard.edu/abs/1927AJ.....37R..91R
  (maximum 10p)

==============================================================================
ATEL #8725							     ATEL #8725

Title:	MASTER-Kislovodsk: bright high amplitude OT
Author:	P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov,
		O. Gress, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Vladimirov (Lomonosov
		Moscow State University, SAI), A. Tlatov, V. Senik, D. Dormidontov,
		A. Parkhomenko (Kislovodsk Solar Station, Pulkovo observatory)
Queries:	tiurina at sai.msu.ru
Posted:	24 Feb 2016; 12:30 UT
Subjects:Optical, Request for Observations, Cataclysmic Variable,
		Transient, Variables

MASTER OT J084140.94+722732.6 discovery - high amplitude dwarf nova outburst(ampl>5.5m)
with MASTER archive 6.6mag outburst in 2013y

MASTER-Kislovodsk auto-detection system ( <A HREF="http://www.hindawi.com/journals/aa/2010/349171/">Lipunov
et al., "MASTER Global Robotic Net",  
Advances in Astronomy, 2010, 349171</A> ) discovered OT source at (RA,
Dec) = 08h 41m 40.94s +72d 27m 32.6s on 2016-02-22.89248 UT.

The OT unfiltered magnitude is 
14.7m
. The OT is seen in 3 images. There is no minor planet at this place. 

We have reference image on 2013-12-30.89828 UT with unfiltered magnitude
limit 19.5m, m_OT~19.7. 

We have archive previous outburst in MASTER-Tunka database on 2013-04-25
19:01:50UT with m_OT=13.1. 

There is USNO-B1 star with B2=18.70,R2=18.73, I=18.72, so we suggest the
dwarf nova outburst with  

Amplitude
more then 
5m
on 22nd of Feb2016 and Ampl>6.6m in last outburst(2013). 

Spectral observations are required. 

The discovery and referencei mages are available at http://master.sai.msu.ru/static/OT/MASTER084140.94+722732.6.jpg

MASTER Global Robotic Net: http://observ.pereplet.ru