MM Sco outburst
Relatively rare outburst (the last reported one in 2001 April). Probably worth further observing.
YYYYMMDD(UT) mag observer 20020829.523 <140 (Rod Stubbings) 20020830.526 <140 (Rod Stubbings) 20020831.455 <140 (Rod Stubbings) 20020901.462 <142 (Rod Stubbings) 20020903.403 <140 (Rod Stubbings) 20020904.415 <140 (Rod Stubbings) 20020905.428 140 (Rod Stubbings) 20020905.440 140 (Rod Stubbings) 20020906.410 134 (Rod Stubbings) 20020906.431 134 (Rod Stubbings) 20020907.401 135 (Rod Stubbings) 20020908.426 135 (Rod Stubbings)
MM Sco: new SU UMa-type dwarf nova!
Dear Colleagues,
Berto Monard took time-series CCD photometry of MM Sco (currently in long, bright outburst) on Sep. 10-11, and just sent us the data. The data clearly shows the presence of 0.1 mag humps, which are most likely superhumps! A preliminary period analysis suggests that the superhump period is around 0.062 d. Further time-series CCD photometry is most urgently requested in order to firmly establish the classification and the period. (The presence of a close neighbor companion may have somewhat reduced the above reported amplitude).
For readers interests, past calls for observations of MM Sco can be found in vsnet-alert 946 and vsnet-campaign 305.
Congratulations, Berto!
Regards, Taichi Kato VSNET Collaboration team
(vsnet-alert 946) The dwarf nova MM Sco is undergoing a relatively rare outburst as reported by R. Stubbings.
YYMMDD(UT) mag observer 970527.438 138 (R. Stubbings) 970527.590 137 (R. Stubbings)MM Sco has a relatively large outburst amplitude (13.0-18.5B in Downes et al. 1997; faint quiescent counterpart indicated, see also Vogt and Bateson 1982, A&AS, 48, 383). GCVS 3 gave a cycle length of >500 days, while GCVS 4 gives 28: days. Vanmunster and Howell's famous "Outburst Activity Database" lists only two outbursts. More observations are clearly needed.
Regards, Taichi Kato(vsnet-campaign 305)
MM Sco bright outburst
From vsnet-outburst message. MM Sco is likely a long-period SS Cyg star (long outbursts only), but there may not have been an attempt to check short-term variability during outburst. Another reason to put this on this campaign list is that the star possibly needs outburst astrometry, since the crowded field has made unambiguous identification a bit difficult.
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