Superbird A Obs

Jim Varney (jamesv@softcom.net)
Mon, 27 Apr 1998 23:14:42 -0700

Observed Superbird A for the last three nights (April 26, 27 and 28 UT).  I 
like to wait for it to get low in the west, where I can hold my binoculars 
and watch in a more comfortable position and hopefully record timings of 
higher accuracy.

89-041 A 98-04-26 04:02:38.19JEV 290.3 0.5  25 11.61  11.613s, +/- 0.028s
89-041 A 98-04-27 04:04:40.37JEV 267.2 0.2  23 11.62  11.619s, +/- 0.010s
89-041 A 98-04-28 04:06:16.83JEV 325.3 0.5  28 11.62  11.616s, +/- 0.024s

The +/- values represent 95% statistical confidence.

If I put all 76 timings together and throw out the 8 most extreme values, 
the half-period is 11.6165 sec. +/- 0.006 sec.  The 8 data points are 4 
pairs of timings such as 11.90 sec followed by 11.30 sec, which I assume 
represent my reaction time being late on a flash.  Being late will cause 
one period to be reported long followed by a short one to "make up."


______________________________________________
Jim Varney
Member, Sacramento Valley Astronomical Society
www.calweb.com/~svas/index.html