[vsnet-alert 6846] 1RXS J232953.9+062814 issue just appeared in IAUC 7747

[Taichi Kato <tkato>]

1RXS J232953.9+062814 issue just appeared in IAUC 7747

(Original submission by Uemura is attached; see the IAUC for the final form).

1RXS J232953.9+062814
     M. Uemura, R. Ishioka, and T. Kato, Kyoto University; 
P. Schmeer, Bischmisheim, Germany; H. Yamaoka, Kyushu University; 
D. Starkey, Auburn, USA, T. Vanmunster, Center for Backyard 
Astrophysics (Belgium); and J. Pietz, Erftstadt, Germany, 
on behalf of VSNET collaboration team, write: "On November 3.926 (UT), 
P. Schmeer detected an outburst (12.5mag) of 1RXS J232953.9+062814 
which had been classified as a dwarf nova (Jingyao, H. et al., 1998, 
Ann. Shanghai Obs., Acad. Sin., 19, 235).  Our CCD photometry on 
November 4.47 - 6.17 revealed superhumps with amplitudes of 
0.2 - 0.3mag and a period of 0.046311(12) d, indicating that this 
object is a new member of SU UMa-type dwarf novae.  This short 
superhump period means that the orbital period of this object is 
certainly below the "period minimum" of hydrogen-rich cataclysmic 
variables (~1.3 hr).  According to Jingyao et al. (1998), the quiescent 
spectrum was dominated by Balmer emission lines, which indicates 
that this object is not an AM CVn star, but a hydrogen-rich system.  
Except for this object, we know only one source, V485 Cen in this class 
(IAUC 6666).  Comparing our CCD images with DSS 1st and 2nd generation 
images, this object shows noticeable (up to 0".1/yr) proper motion.  
In conjunction with its relatively bright magnitude, it indicates the 
small distance of this object.   This object is thus one of the most 
important systems to study the evolutionary scenario of cataclysmic 
variables.  Follow-up observations are strongly encouraged.

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