Re: Gorizont 29 aux motor decay alert

From: Tony Beresford (aberesford@iprimus.com.au)
Date: Sat Jan 06 2001 - 19:31:03 PST

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At 12:12 6/01/01 , Mike Wendt (GUM) wrote:

>
>      One question.  Discounting weather, how far is the observation
>horizon from a reentry?
>
>                    Mike.  (Getting ready for Mir to rain in my back yard.)
Welcome to active status on Seesat,Mike
The range to the horizon from an object at height H aove a sphere
of radius R is SquareRoot ( H*H + 2.*H*R) by pythagoras's theorem.
Putting in easy numbers of H= 100Kmm R= 6378 gets distance = 1140Km.
Using the same formula and a height of 10Km (36,000Ft or so) for your
working cocpit gives a range of about 350Km. So when flying you could
just see something 1400-1500Km away.
Tony Beresford
Adelaide So. Australia
-34.9638, 138.6333E

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