[amsat-bb] Re: ARISSat deployment direction?

Mon Aug 8 06:09:52 PDT 2011


Orbital dynamics are not all that intuitive.  Hand waving answer:  By
kicking it off the tailgate, it was deployed into a _slightly_ lower orbit.
You can see that showing up in your tracking programs as well.  However,
objects in lower orbits have shorter periods.  At 370 km the ISS is about 90
minutes, while satellites at 36,000 km take a day, and are geosynchronous.
In fact, as the nominal altitude of the ISS, a single kilometer change of
height results in a 19 second difference per day in the AOS.  That has been
adding up.  



-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Rich Dailey
Sent: Monday, August 08, 2011 7:44 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] ARISSat deployment direction?

I've seen several comments and reports stating the deployment was
against the ISS velocity vector. Why do I see arissat out ahead of ISS
by a few hundred miles? Keps are current, and 3 tracking programs are in
agreement. Can someone provide enlightenment? tnx...:-)

Rich, N8UX.

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