[amsat-bb] Re: Soft,,, Well Kind Of,,

Joe nss at mwt.net
Sun Feb 15 06:51:13 PST 2009

That's exactly as I was thinking.

With no atmosphere, the moon,  you could in theory orbit with a decaying 
orbit until it was only as high as the surface,  (But of course the 
mountains are a problem.)

But Some numbers were crunched,,  and say a lander was orbiting, and 
slowed down just the right amount that it began to decay.  ever soo 
slowly,  in theory of it was a perfect sphere and smooth as glass  the 
thing could orbit inches above the surface true?

But  the moons gravity is very un even as well as the surface..  But 
give the sphere and smooth thought,

It could orbit and eventually land at a speed of,  1.68 km per second or 
slightly over 6000 MPh!  don't think it could survive.

Oh well..

Bob Christy wrote:

>In 1966, the Soviet Luna 9 survived a near-vertical landing on the Moon 
>with a speed of about 50km/h (approx 30mph). It used an inflated bag to 
>cushion the impact.
>In 1997, America's Pathfinder rover used a similar technique and touched 
>down on Mars with a similar vertical speed. It was designed to take an 
>impact about fifty percent greater than it actually experienced.
>It would be possible to land something at a high velocity, providing the 
>vertical component is not much more than that of Luna 9 or Pathfinder. 
>Horizontal speed can be killed by rolling and bouncing, as happened with 
>Pathfinder when it struck the surface at an angle of about 50 degrees.
>The downside of this approach comes in the form of any significant 
>vertical obstruction such as a large boulder or a cliff face.
>Bob Christy
>What speed do you think would be max survivable speed for a landing on 
>the moon for a robot, or comm system?
>How fast could something hit and survive?
> Joe
>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list