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[vsnet-alert 1820] (fwd) V2051 Oph - improved eclipse timings



Date: Tue, 26 May 1998 13:32:08 +0200 (SAT)
From: Sonja Vrielmann <sonja@pinguin.ast.uct.ac.za>
To: Variable Star Net - Administration <vsnet-adm@kusastro.kyoto-u.ac.jp>
Subject: V2051 Oph - improved eclipse timings 

Dear Astronomers,

the eclipse timings you distributed are too early by about 5 min. You
probably have taken the parabolic ephemeris of Echevarria & Alvarez (1993)
which don't fit over the years. The eclipses seem better calculated with
their linear ephemeris:

HJD(eclipse) =  2444043.680190 + 0.0624278870 * E

Eclipse timings for the next days are attached.

Best regards,
Sonja.

-------------------------------------------------*---------------------
 Dr. Sonja Vrielmann                                  *    *
  Dept. of Astronomy, University of Cape Town      *    *
  Private Bag, Rondebosch, 7700      Tel: +27-21-650-4042, Fax: -3352
 South Africa                       Email: sonja@pinguin.ast.uct.ac.za
-----------------------------------------------------------------------

 Date: 23/24 May  1998       
  
    HJDmin(2400000+)      Cycle       Eclipse (UT)
   ==================   =========    ==============
     50957.006824267      110741        12: 1:43
     50957.069252154      110742        13:31:37
     50957.131680041      110743        15: 1:30
     50957.194107928      110744        16:31:24
     50957.256535815      110745        18: 1:18
     50957.318963702      110746        19:31:11
     50957.381391589      110747        21: 1: 5
     50957.443819476      110748        22:30:59
     50957.506247363      110749         0: 0:52
     50957.568675250      110750         1:30:46
     50957.631103137      110751         3: 0:39
     50957.693531024      110752         4:30:33
     50957.755958911      110753         6: 0:27
     50957.818386798      110754         7:30:20
     50957.880814685      110755         9: 0:14
     50957.943242572      110756        10:30: 8

 Date: 24/25 May  1998
  
    HJDmin(2400000+)      Cycle       Eclipse (UT)
   ==================   =========    ==============
     50958.005670459      110757        12: 0: 1
     50958.068098346      110758        13:29:55
     50958.130526233      110759        14:59:48
     50958.192954120      110760        16:29:42
     50958.255382007      110761        17:59:36
     50958.317809894      110762        19:29:29
     50958.380237781      110763        20:59:23
     50958.442665668      110764        22:29:17
     50958.505093555      110765        23:59:10
     50958.567521442      110766         1:29: 4
     50958.629949329      110767         2:58:58
     50958.692377216      110768         4:28:51
     50958.754805103      110769         5:58:45
     50958.817232990      110770         7:28:38
     50958.879660877      110771         8:58:32
     50958.942088764      110772        10:28:26
     50959.004516651      110774        11:58:19   

 Date: 25/26 May  1998       
  
    HJDmin(2400000+)      Cycle       Eclipse (UT)
   ==================   =========    ==============
     50959.066944538      110774        13:28:13
     50959.129372425      110775        14:58: 7
     50959.191800312      110776        16:28: 0
     50959.254228199      110777        17:57:54
     50959.316656086      110778        19:27:48
     50959.379083973      110779        20:57:41
     50959.441511860      110780        22:27:35
     50959.503939747      110781        23:57:28
     50959.566367634      110782         1:27:22
     50959.628795521      110783         2:57:16
     50959.691223408      110784         4:27: 9
     50959.753651295      110785         5:57: 3
     50959.816079182      110786         7:26:57
     50959.878507069      110787         8:56:50
     50959.940934956      110788        10:26:44
     50960.003362843      110789        11:56:37

 Date: 26/27 May  1998       
  
    HJDmin(2400000+)      Cycle       Eclipse (UT)
   ==================   =========    ==============
     50960.065790730      110790        13:26:31
     50960.128218617      110791        14:56:25
     50960.190646504      110792        16:26:19
     50960.253074391      110793        17:56:12
     50960.315502278      110794        19:26: 6
     50960.377930165      110795        20:56: 0
     50960.440358052      110796        22:25:53
     50960.502785939      110797        23:55:47
     50960.565213826      110798         1:25:40
     50960.627641713      110799         2:55:34
     50960.690069600      110800         4:25:28
     50960.752497487      110801         5:55:21
     50960.814925374      110802         7:25:15
     50960.877353261      110803         8:55: 9
     50960.939781148      110804        10:25: 2
     50961.002209035      110805        11:54:55

 Date: 27/28 May  1998       
  
    HJDmin(2400000+)      Cycle       Eclipse (UT)
   ==================   =========    ==============
     50961.064636922      110806        13:24:50
     50961.127064809      110807        14:54:43
     50961.189492696      110808        16:24:37
     50961.251920583      110809        17:54:31
     50961.314348470      110810        19:24:24
     50961.376776357      110811        20:54:18
     50961.439204244      110812        22:24:12
     50961.501632131      110813        23:54: 5
     50961.564060018      110814         1:23:59
     50961.626487905      110815         2:53:53
     50961.688915792      110816         4:23:46
     50961.751343679      110817         5:53:40
     50961.813771566      110818         7:23:34
     50961.876199453      110819         8:53:27
     50961.938627340      110820        10:23:21
     50962.001055227      110821        11:53:14

 Date: 28/29 May  1998       

    HJDmin(2400000+)      Cycle       Eclipse (UT)
   ==================   =========    ==============
     50962.063483114      110822        13:23: 8
     50962.125911001      110823        14:53: 2
     50962.188338888      110824        16:22:56
     50962.250766775      110825        17:52:49
     50962.313194662      110826        19:22:43
     50962.375622549      110827        20:52:37
     50962.438050436      110828        22:22:30
     50962.500478323      110829        23:52:24
     50962.562906210      110830         1:22:18
     50962.625334097      110831         2:52:11
     50962.687761984      110832         4:22: 5
     50962.750189871      110833         5:51:59
     50962.812617758      110834         7:21:52
     50962.875045645      110835         8:51:46
     50962.937473532      110836        10:21:40
     50962.999901419      110837        11:51:33

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