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OT 071948.9+405332 is a Cataclysmic Variable in outburst

ATEL # 2883; D. Denisenko (IKI, Moscow)
on 29 Sep 2010; 13:24 UT
Password Certification: M. Revnivtsev (

Subjects: Optical, Cataclysmic Variables, Transients

We have checked the available archival images of the optical transient in Auriga OT 071948.9+405332 reported in ATel #2878 by MASTER team (Shumkov et al.) and have identified it with the faint blue star SDSS J071948.92+405331.8 (u=21.64, g=21.83, r=21.51, i=21.53, z=21.98) which is also visible on Blue Palomar plate taken on 1997 Apr. 08. The outburst amplitude (about 5m) and fast raise reported in ATel 2878 (by more than 1m in 5 hours) strongly suggest the dwarf nova outburst caught on the early stage. SDSS colors are also consistent with the cataclysmic variable in quiescence.

The finder charts of the new variable (color-combined DSS and SDSS) with the position of OT marked with dashes are available at

The photometric time series are desirable to search for possible superhumps, to measure the period and to determine the variability subtype.

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