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Re: (meteorobs) aurora map
----- Original Message -----
From: "Aaron Price" <aaronp@shoredot net>
To: <meteorobs@jovian.com>
Sent: Thursday, June 08, 2000 4:40 PM
Subject: (meteorobs) aurora map
> Its from the NOAA POES satellite and I think passes each pole once per
hour
> or so.
Not nearly so frequently, Aaron. No satellite of Earth can orbit that fast.
The period of any Earth satellite (T) in minutes is related to its altitude
(h) in km by the equation
T = 5.27 x 10*-9 (6.37 x 10*6 + h x 10*3)*3/2
A satellite at altitude 100 mi = 161 km has a period of 88.5 minutes. To
have a period of only 60 minutes, a satellite would need a much smaller
orbital radius. In fact, it would have to orbit 1400 km inside the Earth's
surface but with all the Earth's mass within its orbit.
Paul O. Johnson
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