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[vsnet-alert 4633] V2051 Oph eclipse ephemeris



V2051 Oph eclipse ephemeris

   The rare deeply eclipsing SU UMa-type dwarf nova V2051 Oph (cf. IBVS
4644) is most likely undergoing a superoutburst.  High-speed photometry
is very urgently requested.

  See also
  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/v2051oph.html
  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/v2051oph9907.html

=============== Announcements made On 1998 May superoutburst =================

(from vsnet-alert 1796)
  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.

(from vsnet-alert 1819)
PDM analysis by Kato using CCD observation by Kiyota on May 20-22 (posted to
vsn et-obs) indicates that superhump period of V2051 Oph is around 0.0642d.
This period is a little bit longer than orbital (eclispse) period.

So, we conclude that V2051 is one of member of UGSU (SU UMa type).

                                    Seiichiro Kiyota and Taichi Kato

==============================================================================

  Ephemeris used: 2444787.321141 + 0.062427860 E

  YYYYMMDD hh:mm:ss (UT, geocentric)
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  20000416 00:16:40
  20000416 01:46:33
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  20000416 10:45:53
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  20000416 15:15:33
  20000416 16:45:26
  20000416 18:15:20
  20000416 19:45:13
  20000416 21:15:07
  20000416 22:45:00

  20000417 00:14:53
  20000417 01:44:47
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  20000417 21:13:20
  20000417 22:43:14

  20000418 00:13:07
  20000418 01:43:00
  20000418 03:12:54
  20000418 04:42:47
  20000418 06:12:40
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  20000418 09:12:27
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  20000418 18:11:47
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  20000418 21:11:34
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  20000419 00:11:21
  20000419 01:41:14
  20000419 03:11:07
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  20000419 06:10:54
  20000419 07:40:47
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  20000419 21:09:48
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  20000420 00:09:34
  20000420 01:39:28
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  20000420 04:39:15
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  20000420 09:08:55
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  20000420 21:08:02
  20000420 22:37:55

  20000421 00:07:48
  20000421 01:37:42
  20000421 03:07:35
  20000421 04:37:29
  20000421 06:07:22
  20000421 07:37:15
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  20000421 13:36:49
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  20000421 22:36:09

  20000422 00:06:02
  20000422 01:35:56
  20000422 03:05:49
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  20000422 06:05:36
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  20000422 10:35:16
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  20000422 13:35:03
  20000422 15:04:56
  20000422 16:34:50
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  20000422 19:34:36
  20000422 21:04:30
  20000422 22:34:23

  20000423 00:04:17
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  20000423 04:33:57
  20000423 06:03:50
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  20000423 13:33:17
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  20000423 19:32:51
  20000423 21:02:44
  20000423 22:32:38

  20000424 00:02:31
  20000424 01:32:24
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  20000424 04:32:11
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  20000424 07:31:58
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  20000424 22:30:52

  20000425 00:00:45
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  20000425 22:29:06

  20000425 23:59:00
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