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[vsnet-campaign-news 132] Rare outburst of HT Cas




  ====================================================================
               Rare outburst of the eclipsing SU UMa-type
                         dwarf nova HT Cas
  ====================================================================

    Pavol A. Dubovsky (Slovakia) reports that the famous eclipsing SU UMa-type
dwarf nova HT Cas is undergoing a rare outburst.  No superoutburst of
this star has been reported for 17 years!  Present outburst seems to be
slightly different from past normal outbursts in its relatively slow
decay.  No one yet definitely knows whether the present outburst is
a mere variety of normal outbursts, or is evolving toward a long-awaited
superoutburst.  Please observe HT Cas as frequently as possible, in order
to record deep eclipses, and to check the presence of superhumps.

    VSNET has created a special mailing list for the campaign in this
rare outburst.  One can join the list by sending an e-mail with a line:

SUBSCRIBE vsnet-campaign-htcas

    to vsnet-adm@kusastro.kyoto-u.ac.jp

    See also the VSNET HT Cas page:

    http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/htcas.html

[Disovery information]
===

Date: Tue, 5 Feb 2002 19:01:01 +0100
Subject: [vsnet-alert 7169] HT Cas outburst

Long waited outburst of HT Cas is here:
---------------
CASHT 020205.7632  13.6  DPV   V3-139

Clear skies!
Pavol A. Dubovsk& Chermelin 300/1504 mm
Cientific & Cultural Centre in Orava<http://vsnet.vkco.sk>, e-mail:
vkco@isternet.sk
Podbiel, SLOVAKIA

member of the MEDUZA <http://vsnet.meduza.info> group

---

Date: Tue, 05 Feb 2002 20:11:37 +0100
From: Gianluca Masi <gianmasi@fr.flashnet.it>
Subject: [vsnet-alert 7170] Re: HT Cas outburst

A great news, indeed! Please, keep a close eye to this guy. On July 1999
we had the star brighter than mag. 13, but it turned out to be a normal
outburst. Info for that outburst can be seen at:

http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/htcas9907.html

Clear Skies,
Gianluca

---

From: "eddy muyllaert" <eddy.muyllaert@ping.be>
Date: 	Tue, 5 Feb 2002 21:05:16 +0100
Subject: [vsnet-alert 7171] Confirmation outburst of HT Cas!!!

Star             UT            Mag
-------------------------------------
CASHT     Feb 5.813     13.8     Seq. AAVSO

Eddy Muyllaert
Oostende, Belgium
eddy.muyllaert@ping.be

===

[Predicted eclipse times]

  YYYYMMDD hh:mm:ss (UT, geocentric)
 ------------------------------------
  20020205 01:29:40
  20020205 03:15:44
  20020205 05:01:47
  20020205 06:47:51
  20020205 08:33:54
  20020205 10:19:58
  20020205 12:06:01
  20020205 13:52:05
  20020205 15:38:08
  20020205 17:24:12
  20020205 19:10:15
  20020205 20:56:19
  20020205 22:42:23

  20020206 00:28:26
  20020206 02:14:30
  20020206 04:00:33
  20020206 05:46:37
  20020206 07:32:40
  20020206 09:18:44
  20020206 11:04:47
  20020206 12:50:51
  20020206 14:36:55
  20020206 16:22:58
  20020206 18:09:02
  20020206 19:55:05
  20020206 21:41:09
  20020206 23:27:12

  20020207 01:13:16
  20020207 02:59:19
  20020207 04:45:23
  20020207 06:31:27
  20020207 08:17:30
  20020207 10:03:34
  20020207 11:49:37
  20020207 13:35:41
  20020207 15:21:44
  20020207 17:07:48
  20020207 18:53:51
  20020207 20:39:55
  20020207 22:25:59

  20020208 00:12:02
  20020208 01:58:06
  20020208 03:44:09
  20020208 05:30:13
  20020208 07:16:16
  20020208 09:02:20
  20020208 10:48:23
  20020208 12:34:27
  20020208 14:20:30
  20020208 16:06:34
  20020208 17:52:38
  20020208 19:38:41
  20020208 21:24:45
  20020208 23:10:48

  20020209 00:56:52
  20020209 02:42:55
  20020209 04:28:59
  20020209 06:15:02
  20020209 08:01:06
  20020209 09:47:10
  20020209 11:33:13
  20020209 13:19:17
  20020209 15:05:20
  20020209 16:51:24
  20020209 18:37:27
  20020209 20:23:31
  20020209 22:09:34
  20020209 23:55:38

  20020210 01:41:42
  20020210 03:27:45
  20020210 05:13:49
  20020210 06:59:52
  20020210 08:45:56
  20020210 10:31:59
  20020210 12:18:03
  20020210 14:04:06
  20020210 15:50:10
  20020210 17:36:13
  20020210 19:22:17
  20020210 21:08:21
  20020210 22:54:24

  20020211 00:40:28
  20020211 02:26:31
  20020211 04:12:35
  20020211 05:58:38
  20020211 07:44:42
  20020211 09:30:45
  20020211 11:16:49
  20020211 13:02:53
  20020211 14:48:56
  20020211 16:35:00
  20020211 18:21:03
  20020211 20:07:07
  20020211 21:53:10
  20020211 23:39:14

Regards,
Taichi Kato
On behalf of the VSNET Collaboration team

----------------------------------------------------------------------------

  VSNET (Variable Star Network) is an international variable star observing
network, covering various areas of novae, supernovae, cataclysmic variables
(CVs), X-ray transients, and other classical eruptive, pulsating, and
eclipsing variables.  VSNET is one of invited contributing organizations
to the SkyPub AstroAlert system.

       VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/

CCD observations of such targets are a relatively easy task for a 20-40cm
telescope; simply take as many CCD frames (with exposure times 10-30 sec)
as possible, spanning several hours per night.  The only requirements are
the weather and your patience!  If you need more help on the observing
technique, please feel free to ask on the vsnet-campaign list.

   We would sincerely appreciate volunteers who would join the VSNET
Collaboration team to study the wonders of these exotic variable stars.
To join the VSNET campaign collaborative list, send an e-mail to

         vsnet-adm@kusastro.kyoto-u.ac.jp (VSNET administrator)

with a line "SUBSCRIBE vsnet-campaign." or your comment to join the
collaboration team.

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