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) ------------------------------------- 20000416 00:16:40 20000416 01:46:33 20000416 03:16:26 20000416 04:46:20 20000416 06:16:13 20000416 07:46:06 20000416 09:16:00 20000416 10:45:53 20000416 12:15:46 20000416 13:45:40 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 20000417 03:14:40 20000417 04:44:33 20000417 06:14:27 20000417 07:44:20 20000417 09:14:13 20000417 10:44:07 20000417 12:14:00 20000417 13:43:53 20000417 15:13:47 20000417 16:43:40 20000417 18:13:33 20000417 19:43:27 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 20000418 07:42:34 20000418 09:12:27 20000418 10:42:20 20000418 12:12:14 20000418 13:42:07 20000418 15:12:00 20000418 16:41:54 20000418 18:11:47 20000418 19:41:41 20000418 21:11:34 20000418 22:41:27 20000419 00:11:21 20000419 01:41:14 20000419 03:11:07 20000419 04:41:01 20000419 06:10:54 20000419 07:40:47 20000419 09:10:41 20000419 10:40:34 20000419 12:10:28 20000419 13:40:21 20000419 15:10:14 20000419 16:40:08 20000419 18:10:01 20000419 19:39:54 20000419 21:09:48 20000419 22:39:41 20000420 00:09:34 20000420 01:39:28 20000420 03:09:21 20000420 04:39:15 20000420 06:09:08 20000420 07:39:01 20000420 09:08:55 20000420 10:38:48 20000420 12:08:41 20000420 13:38:35 20000420 15:08:28 20000420 16:38:22 20000420 18:08:15 20000420 19:38:08 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 20000421 09:07:09 20000421 10:37:02 20000421 12:06:55 20000421 13:36:49 20000421 15:06:42 20000421 16:36:36 20000421 18:06:29 20000421 19:36:22 20000421 21:06:16 20000421 22:36:09 20000422 00:06:02 20000422 01:35:56 20000422 03:05:49 20000422 04:35:43 20000422 06:05:36 20000422 07:35:29 20000422 09:05:23 20000422 10:35:16 20000422 12:05:10 20000422 13:35:03 20000422 15:04:56 20000422 16:34:50 20000422 18:04:43 20000422 19:34:36 20000422 21:04:30 20000422 22:34:23 20000423 00:04:17 20000423 01:34:10 20000423 03:04:03 20000423 04:33:57 20000423 06:03:50 20000423 07:33:44 20000423 09:03:37 20000423 10:33:30 20000423 12:03:24 20000423 13:33:17 20000423 15:03:11 20000423 16:33:04 20000423 18:02:57 20000423 19:32:51 20000423 21:02:44 20000423 22:32:38 20000424 00:02:31 20000424 01:32:24 20000424 03:02:18 20000424 04:32:11 20000424 06:02:04 20000424 07:31:58 20000424 09:01:51 20000424 10:31:45 20000424 12:01:38 20000424 13:31:31 20000424 15:01:25 20000424 16:31:18 20000424 18:01:12 20000424 19:31:05 20000424 21:00:58 20000424 22:30:52 20000425 00:00:45 20000425 01:30:39 20000425 03:00:32 20000425 04:30:25 20000425 06:00:19 20000425 07:30:12 20000425 09:00:06 20000425 10:29:59 20000425 11:59:52 20000425 13:29:46 20000425 14:59:39 20000425 16:29:33 20000425 17:59:26 20000425 19:29:20 20000425 20:59:13 20000425 22:29:06 20000425 23:59:00 20000426 01:28:53 20000426 02:58:47 20000426 04:28:40 20000426 05:58:33 20000426 07:28:27 20000426 08:58:20 20000426 10:28:14 20000426 11:58:07 20000426 13:28:00 20000426 14:57:54 20000426 16:27:47 20000426 17:57:41 20000426 19:27:34 20000426 20:57:27 20000426 22:27:21 20000426 23:57:14 20000427 01:27:08 20000427 02:57:01 20000427 04:26:55 20000427 05:56:48 20000427 07:26:41 20000427 08:56:35 20000427 10:26:28 20000427 11:56:22 20000427 13:26:15 20000427 14:56:08 20000427 16:26:02 20000427 17:55:55 20000427 19:25:49 20000427 20:55:42 20000427 22:25:36