[vsnet-alert 10129] V2491 Cyg dramatic fading

[Taichi Kato]

   As reported by Martin Nicholson, V2491 Cyg has dramatically faded
following the rebrightening.  The behavior is thus very similar to
the rebrightening phenomena in V2362 Cyg and V1493 Aql.  Multicolor
photometry (especially infrared to see if dust formation occurs)
and spectroscopy are urgently requested.

  YYYYMMDD(UT)   mag  observer
  20080420.714  9.82V  (Kazuhiro Nakajima)
  20080420.716  8.67Rc  (Kazuhiro Nakajima)
  20080420.719  9.90B  (Kazuhiro Nakajima)
  20080420.722  10.08y  (Kazuhiro Nakajima)
  20080421.023  10.043C  (Lubomir Urbancok)
  20080421.081    99  (Bjorn H. Granslo)
  20080421.702  10.12y  (Kazuhiro Nakajima)
  20080421.705  9.86V  (Kazuhiro Nakajima)
  20080421.707  8.78Rc  (Kazuhiro Nakajima)
  20080421.711  9.93B  (Kazuhiro Nakajima)
  20080421.988    99  (Bjorn H. Granslo)
  20080422.408  9.80V  (Martin Nicholson)
  20080422.408  9.85B  (Martin Nicholson)
  20080423.051    97  (Bjorn H. Granslo)
  20080424.000    98  (Bjorn H. Granslo)
  20080424.051  9.342C  (Lubomir Urbancok)
  20080424.125   101  (Jose Ripero)
  20080424.689    98  (Yutaka Maeda)
  20080424.690  9.84y  (Kazuhiro Nakajima)
  20080424.692  9.59V  (Kazuhiro Nakajima)
  20080424.696  8.68Rc  (Kazuhiro Nakajima)
  20080424.698  9.66B  (Kazuhiro Nakajima)
  20080424.778    98  (Susumu Takahashi)
  20080425.014    98  (Bjorn H. Granslo)
  20080425.016    94  (Laurent Bichon)
  20080425.444  9.57V  (Martin Nicholson)
  20080425.444  9.63B  (Martin Nicholson)
  20080425.765  9.86y  (Kazuhiro Nakajima)
  20080425.769  9.58V  (Kazuhiro Nakajima)
  20080425.770  8.68Rc  (Kazuhiro Nakajima)
  20080425.781  9.67B  (Kazuhiro Nakajima)
  20080425.929    95  (Laurent Bichon)
  20080426.374  9.56V  (Martin Nicholson)
  20080426.376  9.60B  (Martin Nicholson)
  20080427.058    98  (Georg Comello)
  20080427.083    99  (Wolfgang Kriebel)
  20080428.403  11.13V  (Martin Nicholson)
  20080428.403  11.17B  (Martin Nicholson)