Re: Saw Mir & STS-86

cyberkil (cyberkil@fcol.com)
Sun, 28 Sep 1997 02:34:19 +0000

i also had the shuttle ahead of mir on my tracking program the last few hours
before docking. i couldnt find a reacent tle after there last burn so i gave up

and used the mir's vectors.

i use stsplus to track mir and the shuttles.
is this the best program to use when tracking satellites?

by the way, it has been raining here nonstop since friday morning.
no chance of seeing anything this weekend. darn, i have aos for the
docked the mir and shuttle coming up in 54 minutes.  met-1:24:00:00

Philip Chien wrote:

> JRBURCA@aol.com said:
>
> >I saw Mir & STS around 12:25-12:30 UTC 27-Sept-97 both in the
> >sky at the same time perhaps 60 degrees apart about 7.5 hrs.
> >before docking.  STS-86 was first followed by Mir.
>
> not unless you were looking at it from a *rather* unusual angle ...
>
> When travelling to Mir the shuttle is in a _lower_ orbit.  (for obvious
> reasons).  So the shuttle has to 'catch up' with Mir.  The shuttle launches
> when the orbital plane matches Mir's orbital plane (i'm simplifying a bit.
> It's slightly different because it takes time for the shuttle to reach
> orbit and the window can be expanded with performance as a tradeoff, etc.).
> So Mir can be anywhere in its orbit relative to the shuttle at launch.  But
> since the shuttle's in a lower orbit it will quickly catch up with Mir by
> travelling a bit 'faster' around the world on each orbit.  So the shuttle
> is always 'chasing' Mir until the docking occurs.
>
> If, for some reason, your tracking program shows the shuttle ahead of Mir,
> then either you haven't updated your elements since the most recent shuttle
> burn to raise its orbit up to Mir's altitude or ...
>
> They overshot their target!
>
> Philip Chien [M1959.05.31/31.145//KC4YER@amsat.org]



--
Brandon S. Sluder email: cyberkil@cyberdude.com
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