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Article #146Gravity Assists (Was Re: Query Re: pluto direct)
From: Ron Baalke
Date: Sat, 31 Oct 1992 05:33
Date: Sat, 31 Oct 1992 05:33
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In article <1992Oct30.163302.15547@rcvie.co.at>, se_taylo@rcvie.co.at (Ian Taylor) writes...
>
>While I'm here, anyone know if a gravity assist trajectory can be used to
>*reduce* speed?
Sure. Mariner 10 used a gravity assist of Venus to help it decelerate towards
Mercury. Voyager 2 lost speed when it flew by Neptune on its way out of
the solar system. Ulysses utilized a gravity assist of Jupiter to leave
the ecliptic plane, which in turn cut the spacecraft's heliocentric velocity
in half. Galileo will be using a Io gravity assist help it slow down
enough to go into orbit around Jupiter.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
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Newsgroups: sci.space Path: arc1-ca.pugleaf.net!sparky!uunet!think.com!ames!elroy.jpl.nasa.gov!kelvin.jpl.nasa.gov!baalke From: baalke@kelvin.jpl.nasa.gov (Ron Baalke) Subject: Gravity Assists (Was Re: Query Re: pluto direct) Message-ID: <1992Oct30.214251.17617@elroy.jpl.nasa.gov> News-Software: VAX/VMS VNEWS 1.3-4 Sender: news@elroy.jpl.nasa.gov (Usenet) Nntp-Posting-Host: kelvin.jpl.nasa.gov Reply-To: baalke@kelvin.jpl.nasa.gov Organization: Jet Propulsion Laboratory References: <719132495.F00003@blkcat.UUCP> <1992Oct30.163302.15547@rcvie.co.at> Date: Sat, 31 Oct 1992 05:33:00 GMT Lines: 18