Observation of Telstar 401 (93 77A, 22927)

Mike McCants (mikem@fc.net)
Thu, 16 Jan 1997 00:04:39 -0600

Tonight was Jan. 15, CST, but I will convert all times to
Jan. 16, UT.

I used the 12 1/2inch (30cm) reflector belonging to the Austin
Astronomical Society at lat N 30.314, long W 97.866.

I first used an eyepiece giving about 110x and a field of view
of about 1/2 degree.  I found Telstar 401 about 3:24UT.
At 3:24:08 it moved just south of the southernmost star in
a line of three stars.  This star was SAO 131387 at RA 4 Hr 36 Min
57 Sec, Dec -5 deg 3 min 36 sec (1950).  The predicted time for
RA 4 37.0, Dec -5.1 (1950) was 3:24:12 (+/- 3 seconds).

I have copied my observing log below.

In general, it fluctuated from mag 9 to 13.5 or 14, with brightenings
at 3:37, 3:39, 3:47, 3:53, 4:00, 4:07, and 4:19/20.  The major
brightenings were at 4:07 and 4:19/20, possibly indicating a period
of about 12 or 13 minutes.

Mike McCants
mikem@fc.net


Observing log
-------------
(Magnification 110x)
3:30    mag 13
3:33:15 mag 11
3:34:20 mag 12
3:35:05 mag 13
3:35:30 mag 12
3:36    mag 13
3:37:10 mag 11.5
3:37:30 mag 11
minimum here
3:39:20 mag 11
3:41    mag 13
3:42    mag 14?
At 3:46 I switched to a 180x eyepiece.
3:46    mag 14?
3:47:20 mag 11.5
3:48:45 mag 14?
3:49:45 mag 11.5
3:49:55 "slow flash" to mag 9 for a couple of seconds
minimum here
3:51:50 mag 10.5
3:52:50 mag 9.5 and fading
3:55:00 mag 12
3:56:00 mag 12.5
3:57 to 3:59 steady at mag 12
4:00:00 mag 11 then fading
4:03    very faint
4:05:40 mag 13
4:07:00 to 4:07:30 mag 9.5
4:10:30 mag 13.5
4:12:20 mag 12.5
4:14:00 mag 13.5
4:16:00 mag 14?
4:19:00 to 4:20:30 mag 9 and steady, then going down again