Re: Escape timelines for my interstellar ark
- From: Dr John Stockton <jrs@xxxxxxxxxxxxxxxxxx>
- Date: Sun, 16 Apr 2006 21:04:45 +0100
JRS: In article <slrne443gb.gg5.pete@xxxxxxxxxxx>, dated Sun, 16 Apr
2006 09:23:22 remote, seen in news:uk.sci.astronomy, Peter Lynch
<pete@xxxxxxxxxxx> posted :
On 2006-04-15, ytyourclothes@xxxxxxxxxxx <ytyourclothes@xxxxxxxxxxx> wrote:
Do you know the escape velocity for the solar system?
If the OP had not cross-posted to so many newsgroups, his article would
have been auto-killed by fewer people.
The escape velocity for the Solar System is as low as one likes,
provided that one starts from far enough out and is not significantly
influenced by outside bodies.
The escape velocity from any point within the Solar System (outside Sol,
and ignoring nearby planets, moons, etc.) is Root2 times the circular
orbit speed at that point; and, for Earth, that speed is two pi AU per
year which I think is nearly 30 km/s. But if escaping from circular
orbit, one only needs to add (Root2-1) * circular speed.
Orbit calculators in gravity2.htm; travel calculators in astron-3.htm;
enter via <URL:http://www.merlyn.demon.co.uk/astron-1.htm>.
--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 MIME. ©
Web <URL:http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News.
.
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