Re: Sat track photo

Allen Thomson (
Fri, 24 Sep 1999 17:10:31 -0500

Bruno Tilgner enquired:

> As we are on the subject of unexplained pictures, please have a look
> at In this case
> it is at least certain that the trail was produced by COSMOS 1275 r.
> But what caused the sine wave pattern ?

It looks as if it's a periodic error in the telescope's drive. Notice that
some of the star images are elongated in the direction perpendicular to the
satellite track.   Further study could back out the temporal period of the
oscillation and see if it corresponds to anything in the telescope's drive