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[vsnet-obs 2805] Re: Outburst of SW Vul

Tonny Vanmunster wrote:

> SW Vul, an UG object located at RA = 20h00m05.14s, Decl = +22d56'10.7" 
> (J2000.0) is undergoing a (very?) rare outburst !
> The object (varying between mag 14.5p and 18.5p) is clearly visible on an
> unfiltered CCD image, obtained at the CBA Belgium (using a 10" f/6.3 SCT and
> ST-7 CCD) on May 19.066 UT. It is located VERY close to a 13.4 comparison
> star (sequence T. Kato, Ouda Station, Japan) and therefore difficult to
> estimate on the image. Its unfiltered mag is approx. 15.9.
> 
> Does anyone have additional information on this object ?

   Though I don't have so much informtion on this object as I usually have
on other CVs, the object was discovered by Rosino in 1948.  Glasby (if I
remember correctly) gave an outburst cycle length of 13 days.  My earlier
inspection of the SW Vul field incidentally included in photographs of M27
also supported rather frequent outbursts.  Even though this material was not
statistically designed, the conclusion by Glasby seemed to me basically
correct.

Regards,
Taichi Kato