[vsnet-alert 13602] Re: New CV in Andromeda MASTER OT J232022.36+444330.8

[Gianluca Masi]

Dear Colleagues,

I confirm the presence of this source, now at about mag. 16.4, unfiltered.

I've started a time series, under less than ideal seeing conditions.

Regards,
Gianluca

Denis Denisenko ha scritto:
> MASTER Team reported a new transient source in ATel 3570 (Parhomenko et al.),
> http://www.astronomerstelegram.org/?read=3570
> 
> Coordinates (J2000.0): 23 20 22.36 +44 43 30.8 (+/-0.5")
> 
> Reported unfiltered magnitude: 15.9+/-0.1 on 2011-08-17 23:10:15 UT
> (JD=2455791.465)
> 
> In VSNet format:
> 
>  YYYYMMDD(UT)   mag  observer
>  20110817.965  159C  MASTER-Kislovodsk
> 
> I have checked available Palomar DSS images and have found a previous
> outburst on POSS-I Blue and Red plates taken on 1953 Oct. 31. Object
> is blue at maximum, which suggests the dwarf nova outburst. There is
> nothing at the position of the transient on the other 7 available DSS
> plates, on their combination (limiting magnitude deeper than 21.5), as
> well as on 7 NEAT images and in 2MASS JHK images.
> 
> Comparison of 1953 and 1993 Blue plates (negatives):
> 
> http://pics.livejournal.com/bigdenru/pic/0009w432/
> 
> Animation of the same two plates:
> 
> http://pics.livejournal.com/bigdenru/pic/0009xa2w/
> 
> The current outburst appears to be brighter than the archival 1953
> one, thus it might be a superoutburst. Photometric time series are
> encouraged.
> 
> Denis Denisenko
> 
>