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Welcome!

Welcome on the homepage of the VVS Working Group Variable Stars (VVS WVS).

The Working Group Variable Stars is one of the working groups of the Vereniging Voor Sterrenkunde (VVS), a Belgian amateur astronomical association. The Working Group Variable Stars groups VVS members interested in observing and studying objects that vary in brightness, most of these objects are variable stars but also active galactic nuclei and GRBs among others are included.

On these webpages you'll find information on the working group, the objects of interest, observing techniques, how to report observations, an online DB containing our observations, an online light curve generator etc.

Rare outburst of RS Oph! (13-Feb-2006)

The recurrent nova RS Oph went in outburst for the first time since 1985.

The outburst has been discovered by the Japanese observers Kiyotaka Kanai (Gunma,Isezaki-shi) and Hiroaki Narumi (Ehime,Kita-gun) and was reported on the VSNet-Alert mailing list. H. Narumi estimated the brightness on Feb. 12.829 UT at magnitude 4.5 and K. Kanai somewhat later at magnitude 4.6.

The previous outburst dates back from 28th Januari 1985 when RS Oph reached a maximum magnitude of 5.4. The recurrence time (time interval between outbursts) differs a lot from one outburst to the other. Other outbursts have been observed in 1898, 1933, 1958, 1967 and 1985. The behavior during the outbursts is surprisingly similar in nature.

Typically RS Oph brightens from minimum (around magnitude 11.5) to maximum in less than 24 hours. The star fades in 3 stages, during the first ~40 days the star fades at about 0.1 magnitudes per day, followed by a slower decline at about 0.02 mag/day during 40 a 50 days. During the last stage the star fades again more quickly at about 0.05 mag/day. The duration of the complete outburst takes about 100 - 120 days. During quiescence the star displays variations with an amplitude of 1 to 3 magnitudes.

Only 2 observations of the 1985 outburst could be reported by Frans Van Loo to the VVS WVS. Hopefully this time more VVS WVS observers will be able to observe this interesting object.

Please use the most recent AAVSO charts to make your observations. The charts are available here.

More information on RS Oph:
AAVSO VSOTM May 2000
AAVSO Alert Notice 335

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