Re: Superbird A recovered

Jason Hatton (jason.hatton@etss.u-strasbg.fr)
Fri, 07 Aug 1998 12:49:35 +0000

Hi All,

	The sky was clear this morning & I had another good observation of
Superbird A (20040 / 89-041A) this morning. This time I watched with the
6" telescope, so it was possible to make more accurate measurements.
Flashes first became visible at approx. 03:12 UT & I started timing
shortly afterwards. Flashes were initially mag +6 or so, but rapidly
brightened. The secondary maxima became visible at 03:15 & quickly
brighten until they were comparable to the principle maxima in
brightness. From 03:15:22 to 03:20:01 the maxima were all of fairly
similar brightness as seen in the telescope (at least mag+2, if not
brighter), so interpolating between these points gives a mid point of
03:17:42 (although subjectively I'd say the maxima at 03:18:28 was
brightest, certainly the flashes did start to become fainter after this
point). Despite the rapidly brightening twlight I did manage to see one
flash with the naked eye. From 03:20:01 to 03:22:09 the flashes faded
quite rapidly with the secondary maxima again appearing distinctly
fainter than the primary ones. The last flash that was visible was at
03:22:09. 

Interestingly I observed faint (mag +6 /+7) flashes from Superbird
around 02:58 to 03:01 after which Superbird became invisible again until
the main flashes. 


Matson, Robert wrote:
> Congratulations to Jason Hatton for recovering Superbird A's primary
> flash
> window.  
Thanks, but thanks should also go to you for providing the initial
predictions of visibility!

Best wishes & clear skies,

Jason 

-- 
Jason P Hatton
INSERM U311
ETS Strasbourg
67065 Strasbourg Cedex
France


48.538N / 7.731E / 143m