Re: [sarex] Mir Keps

["Miles Mann" <Miles_Mann@xxxxxxxxxx>]

The general rules for keps are:

The lower the altitude the greater the drag and the more frequently you need to
update your keps.

Unmanned satellites

150 - 300 miles     Weekly

300 - 500 miles     every 2 weeks

500 - 5000 miles     monthly

5000 - 20000 miles  every 2 months

22,500    once a decade

Manned satellites

Shuttle   Every day

Mir  Twice a week.


Your actual mileage may vary.

Miles WF1F MAREX-NA




Paul Yeager <paul.yeager@worldnet.att.net> on 08/02/99 09:38:53 PM

To:   sarex@AMSAT.Org
cc:    (bcc: Miles Mann/PicTel)
Subject:  [sarex] Mir Keps




I just (0120 UTC 8/3) heard considerable packet activity on 145.985.  It
was such a strong signal that I suspected a local terrestrial source, but
it then rapidly faded.

I then looked at my latest orbit predictions, and found that they predicted
a pass from 0058 to 0107.  I am using the latest Keps sent out by Amsat,
but when I run the prediction, it reports that the element set epoch is 90
days ago.

Can someone explain to me why I am having this discrepancy?  Should I have
Keps with a more recent element set epoch?

Thanks and 73,
Paul W4SKI

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