[vsnet-alert 13605] Re: MASTER OT J232022.36+444330.8 likely is a new SU UMa star in the period gap.

[Gianluca Masi]

Dear Colleagues,

After 2.8 hours of photometry, I can estimate a Psh for this star of 
2.1, so this is in the period gap. I will track the star for two hours 
more. The full superhump amplitude is of 0.3 mags.

Regards,
Gianluca

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