[vsolj-alert 678] V2051 Oph likely superoutburst!

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

V2051 Oph likely superoutburst!

　過去のスーパーアウトバースト時の情報（1998年５月のMEI/NEKOさん発見時の
　もの）および予報です。

mail vsnet-alert
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

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

　以下は日本で見える（日本時間の）予報です。夜半過ぎから条件が良くなります。

  Ephemeris used: 2444787.321141 + 0.062427860 E

  20000416 22:45:40   1
  20000416 24:15:33  15
  20000416 25:45:26  26
  20000416 27:15:20  30
  20000416 28:45:13  27
  20000416 30:15:07  17

  20000417 22:43:53   2
  20000417 24:13:47  16
  20000417 25:43:40  26
  20000417 27:13:33  30
  20000417 28:43:27  26
  20000417 30:13:20  17

  20000418 22:42:07   2
  20000418 24:12:00  16
  20000418 25:41:54  26
  20000418 27:11:47  30
  20000418 28:41:41  26
  20000418 30:11:34  16

  20000419 22:40:21   2
  20000419 24:10:14  16
  20000419 25:40:08  26
  20000419 27:10:01  30
  20000419 28:39:54  26
  20000419 30:09:48  16

  20000420 22:38:35   3
  20000420 24:08:28  17
  20000420 25:38:22  26
  20000420 27:08:15  30
  20000420 28:38:08  26
  20000420 30:08:02  16

  20000421 22:36:49   3
  20000421 24:06:42  17
  20000421 25:36:36  27
  20000421 27:06:29  30
  20000421 28:36:22  26
  20000421 30:06:16  15

  20000422 22:35:03   3
  20000422 24:04:56  17
  20000422 25:34:50  27
  20000422 27:04:43  30
  20000422 28:34:36  25
  20000422 30:04:30  15

  20000423 22:33:17   4
  20000423 24:03:11  18
  20000423 25:33:04  27
  20000423 27:02:57  30
  20000423 28:32:51  25
  20000423 30:02:44  15

  20000424 22:31:31   4
  20000424 24:01:25  18
  20000424 25:31:18  27
  20000424 27:01:12  30
  20000424 28:31:05  25
  20000424 30:00:58  14

  20000425 22:29:46   5
  20000425 23:59:39  18
  20000425 25:29:33  27
  20000425 26:59:26  30
  20000425 28:29:20  25
  20000425 29:59:13  14

  20000426 22:28:00   5
  20000426 23:57:54  18
  20000426 25:27:47  27
  20000426 26:57:41  30
  20000426 28:27:34  25
  20000426 29:57:27  14

  20000427 22:26:15   5
  20000427 23:56:08  19
  20000427 25:26:02  27
  20000427 26:55:55  30
  20000427 28:25:49  25
  20000427 29:55:42  14

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