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