First-ever-observed!? superoutburst of V2051 Oph

(CCD light curve kindly provided by L. T. Jensen. Clear eclipse superimposed on a superhump is seen).

Possible superoutburst of V2051 Oph

The eclipsing, suspected SU UMa-type dwarf nova has brightened considerably, indicating the star undergoing the first-ever-observed superoutburst since the discovery. According to Wenzel (IBVS), an examination of ~400 Sonneberg plates could not reveal brightenings (typical limiting magnitude 11.5-13).

High-speed photometry to reveal superhumps and eclipse features is most urgently requested.

Observations (including eclipse observations):

  YYMMDD(UT)   mag  observer
  980517.000  <138  (D. Overbeek)
  980517.473   135  (R. Stubbings)
  980517.481   136  (R. Stubbings)
  980517.488   136  (R. Stubbings)
  980517.999   134  (D. Overbeek)
  980518.427   119  (R. Stubbings)
  980518.500   117  (P. Nelson)
  980518.501   117  (P. Nelson)
  980518.501   119  (R. Stubbings)
  980518.501   119  (P. Nelson)
  980518.501   119  (R. Stubbings)
  980518.502   119  (P. Nelson)
  980518.502   119  (R. Stubbings)
  980518.503   119  (P. Nelson)
  980518.503   120  (R. Stubbings)
  980518.503   120  (R. Stubbings)
  980518.503   122  (P. Nelson)
  980518.504   125  (R. Stubbings)
  980518.504   126  (P. Nelson)
  980518.505   128  (P. Nelson)
  980518.505   128  (R. Stubbings)
  980518.506   126  (P. Nelson)
  980518.506   130  (R. Stubbings)
  980518.506   123  (P. Nelson)
  980518.506   128  (R. Stubbings)
  980518.507   120  (P. Nelson)
  980518.507   125  (R. Stubbings)
  980518.508   119  (P. Nelson)
  980518.508   120  (R. Stubbings)
  980518.508   119  (P. Nelson)
  980518.508   120  (R. Stubbings)
  980518.509   117  (P. Nelson)
  980518.509   120  (R. Stubbings)
  980518.510   119  (P. Nelson)
  980518.510   119  (R. Stubbings)
  980518.510   119  (P. Nelson)

Regards,
Taichi Kato