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[vsnet-alert 848] Large-amplitude modulation of V651 Mon

   V651 Mon (the central star of the planetary nebula NGC 2346) is again
exhibiting a large amplitude 16-day modulation since the end of this March.
This may be interpreted as a result of partial obscuration of the binary
by a cloud with a steep density gradient.  Observations now and coming
cycles are of utmost importance in order to know the density structure
of the obscuring cloud.

  Selected observations:

  YYMMDD(UT)   mag  code
  970319.824   140: POY
  970324.492  <134  Wnt
  970324.858  <139  POY
  970326.874  <145  POY
  970328.417  14.01V  Oud
  970329.865   146: POY
  970330.421  13.26V  Oud
  970330.533   131: Wnt
  970331.430  12.92V  Oud
  970331.839   128  POY
  970331.910   129: AFO
  970401.421  12.24V  Oud
  970402.169   118  MRV
  970410.858  <139  POY
  970413.424  14.00V  Oud
  970414.438  13.96V  Oud

Regards,
Taichi Kato

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