[vsnet-alert 13604] MASTER OT J232022.36+444330.8 likely is a new SU UMa star

[Gianluca Masi]

Dear Colleagues,

after about 0.6 hours of time-resolved photometry, via the robotic 
Virtual Telescope facility in Italy, I see a very likely evidence of 
superhumps, with an amplitude of at least 0.2 mags.

So, this should be a new SU UMa star. Observations are ongoing.

Regards,
Gianluca

Gianluca Masi ha scritto:
> 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
>>
>>
> 
>