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#1 2004-05-06 08:07:39

bolbuyk
Member
From: Utrecht, Netherlands
Registered: 2004-04-07
Posts: 178

Re: 'Height' of atmosphere

With what 'height' of atmospehere should you work if you like to calculate on orbits around Mars? I can't find the numbers. In a book I read 50 km, somewhere on the internet 120 km, and by making a guess by the gas-law about 210 km.

Apollo went round some orbits at a height of 185 km, so the pressure of 10e-5 Pa is appearantly a number to begin with.

In that case Venus' atmosperic height would be about 270 km.

Does anybody know the numbers? Can't find it on the web.

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#2 2004-05-06 08:11:06

Byron
Member
From: Florida, USA
Registered: 2002-05-16
Posts: 844

Re: 'Height' of atmosphere

With what 'height' of atmospehere should you work if you like to calculate on orbits around Mars? I can't find the numbers. In a book I read 50 km, somewhere on the internet 120 km, and by making a guess by the gas-law about 210 km.

Apollo went round some orbits at a height of 185 km, so the pressure of 10e-5 Pa is appearantly a number to begin with.

In that case Venus' atmosperic height would be about 270 km.

Does anybody know the numbers? Can't find it on the web.

I don't know if this will be a help to you or not, but here's a cool link to play with air pressure and gravity..just punch in the appropiate variables and see what you come up with...
http://www.personal.usyd.edu.au/~gerhar … e.html]Air Pressure calculator

B

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#3 2004-05-06 21:29:11

RobS
Banned
From: South Bend, IN
Registered: 2002-01-15
Posts: 1,701
Website

Re: 'Height' of atmosphere

I once saw the altitudes used to aerobrake orbiting vehicles that lacked heat shields (they used the solar panels) and I was surprised it was so low; maybe 60 or 80 kilometers, I think. But a permanent, stable orbit around Mars would be higher. Probably 200 km is a good guess.

        -- RobS

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