[vsnet-alert 22293] MASTER OT J104822.39-453356.8

[Taichi Kato]

MASTER OT J104822.39-453356.8

   Gaia G=20.67, B-R=0.36.  Good candidaite for an SU UMa-type
dwarf nova.

===

ATEL #11834							     ATEL #11834

Title:	MASTER: OT with  5.8mag amplitude of outburst
Author:	P. Balanutsa, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA),
		H. Levato (ICATE), D. Buckley(SAAO), V. Kornilov, E. Gorbovskoy, N.
		Tiurina,  I. Gorbunov, A. Kuznetsov, V. Chazov, D. Vlasenko, V. Vladimirov,
		O. Gress (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta
		(Observatorio Astronomico Felix Aguilar San Juan University), C. Saffe
		(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio)
Queries:	tiurina at sai.msu.ru
Posted:	9 Jul 2018; 18:47 UT
Subjects:Optical, Request for Observations, Cataclysmic Variable,
		Transient, Variables



MASTER OT J104822.39-453356.8 detection - dwarf nova outburst, ampl>5.8m

MASTER-OAFA auto-detection system ( <A HREF="http://www.hindawi.com/journals/aa/2010/349171/">Lipunov
et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L</A>
) 

discovered OT source at (RA, Dec) = 10h 48m 22.39s -45d 33m 56.8s on 2018-07-09.07564
UT.

The OT unfiltered magnitude is 
15.2m
(mlim=18.6m).

The OT is seen in 2 inspect images. There is no minor planet at this place.

We have reference image without OT on 2017-12-08.18951 UT with 18.2 unfiltered
magnitude limit (MASTER-OAFA), on 2016-05-02 19:04:07UT with mlim=21.0(MASTER-SAAO)
. 

so the amplitude of current outburst is more then 5.8m 

There is USNO-B1 star with previous outburst in 1982.5 . 

Spectral observations are required. 

The discovery and referenceimages are available at http://master.sai.msu.ru/static/OT/104822.39-453356.8.png