Superoutburst of NSV 10934 in 2003 January

(Outburst image by Chris Stockdale)

(Outburst image by Berto Monard)


(vsnet-alert 7601)

NSV10934 very bright outburst!!

As reported by Rod Stubbings, NSV10934 is undergoing a very bright outburst!! This is the brightest outburst ever observed by the VSNET members; the outburst may be a superoutburst!!

NSV10934       030102.480   150  Stu.RASNZ OUTBURST RISING!
NSV10934       030102.493   150  Stu.RASNZ   "  "
NSV10934       030102.557   146  Stu.RASNZ   "  "
NSV10934       030102.693   120  Stu.RASNZ BRIGHT!
NSV10934       030102.767   119  Stu.RASNZ  "  "
Attached is a call for observation issued on 2002 Dec. 17 (vsnet-campaign-dn 3141). Please make most urgent and intensive observations!

Dear Colleagues,

From the past history of outbursts of NSV 10934, the next outburst is expected to occur within a short time. Since the evolution of outbursts has been always very quick, timely observations (and alerts) are very keenly needed. The object is possibly an analogous object to HT Cam, which displayed multiple periodic oscillations during the outburst last year (see Ishioka et al. (2002) PASJ 54, 581; Kemp et al. (2002) PASP 114, 623). Please make urgent time-resolved photometry when it erupts!

NSV 10934 reference: Kato et al. (2002) A&A 396, 929.

Taichi Kato
VSNET Collaboration team
(vsnet-campaign-dn 3233)

NSV 10934 observation by Berto Monard

Dear Colleagues,

Berto Monard just sent time-series (4.6 hours) observations of NSV 10934 on Jan. 3. The object stayed at maximum during the observation. This observation makes the first-ever time-resolved photometry of NSV 10934 in outburst. Although there is no clear periodicity, there existed modulations up to 0.1 mag. Since the object was observed during the early stage of an outburst, these modulations may develop into superhumps. Please continue observing this object during the current rare, bright outbursting state!

Taichi Kato
VSNET Collaboration team
(vsnet-campaign-dn 3236) NSV 10934 outburst: data from Chris Stockdale

Dear Colleagues,

We have received the time-series data of NSV 10934 from Chris Stockdale. The observation covered an earlier part to Monard's observation.

At a first look, the light curve looks flatter than Monard's run, possibly suggesting that the modulations are growing(?).

Taichi Kato

(Superhumps by Chris Stockdale)

Detection of Superhumps!

NSV 10934: superoutburst of a new SU UMa-type dwarf nova!

Dear Colleagues,

Chris Stockdale has reported fully reduced time-series observation of NSV 10934 taken on January 4. The data clearly show superhumps with amplitude of ~0.15 mag. A preliminary period analysis has yielded a period of 0.0743(8) d, which is naturally subject to further refinement. The object is now firmly established to be an SU UMa-type dwarf nova. Congratulations, Chris! Monard's preceding observation must have caught the growing stage of the superhumps.

The period has also confirmed a suggestion that "the orbital period of NSV 10934 is expected to be slightly longer than that of HT Cam (86 min)" (Kato et al. 2002, A&A 396, 929), although a conparison with HT Cam would require further observations of both objects.

Taichi Kato
VSNET Collaboration team

(Fully grown superhumps by Chris Stockdale)

Nelson's CCD Images

2003 January 6

2003 January 8

2003 January 10

2003 January 15 - rapid fading

Average Superhump Profile

VSNET light curve (requires Java)

Light curve

VSNET data search


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