Re: TLEs for ASTRA 1F

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Jay Respler replied to Bruno Tilgner:

>I've seen many sync sats, but there are also many I have not seen when I=
 =

>looked for them.  I thought it was because they were too faint.

One reason for this could be the observing time. Geosyncs change in
brightness which depends on the sun-observer-satellite angle (the
Astras do so).
On the two pictures of the Astra cluster (Bruno mentioned them),
taken a few weeks ago you can see this effect. The second picture =

shows about one quarter of the ellipse these Astras perform within
one sideral day (exposure time 6 hours).
It also shows the extreme variation in brightness during these 6
hours.

You find them at:
http://ourworld.compuserve.com/homepages/Joh_Mueller/latest.htm

Johannes


Johannes Mueller, Irmtraut/Germany
tel./fax: +49 (0) 6436 8223 =

eMail:    Joh_Mueller@compuserve.com
Location: 50d33m15s N, 8d03m33s E, 354m, UT+1
Internet: http://ourworld.compuserve.com/homepages/Joh_Mueller

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