[meteorite-list] mercury escape numbers? can it be this?
From: rexscates at comcast.net <rexscates_at_meteoritecentral.com>
Date: Fri, 5 Aug 2011 16:04:48 +0000 (UTC)
I don't post much.
I did not do the math. (my calculus has not been used much for many many years.
would not if you had a highly highly elliptical orbit not have to have the full sun escape velocity as it could do the whip around gravitational boost effect from the sun.
also would a highly elliptical orbit have less of a escape velocity?
the second part could be wrong but the first one is always a possibility. (at least in my mind) :)
"But what about Mercury. Mercury's escape velocity is 4.3 km/s. But
> it's downstream from Earth and the Sun is a huge gravitational drain
> plug that devours material. If you think Earth gets a piece of Mars,
> imagine what the Sun gets from Mercury. To escape the Sun ... that is
> to go upstream towards Earth, at Mercury, any fragment would have to
> battle an escape velocity of 67.7 km/s. That's greater than Jupiter !
> You might say ... ok, you don't have to actually escape the Sun, only
> make it from Mercury to Earth. Well, at Earth, the escape velocity is
> 42 km/s from the Sun. That's a loss of 25 km/s ... and don't forget
> the extra 4.3 km/s to get away from Mercury as well ..."
Received on Fri 05 Aug 2011 12:04:48 PM PDT