Re: Gravity Assists (Was Re: Query Re: pluto direct)

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Article #185

#185

From: Josh 'K' Hopkins
Date: Sun, 01 Nov 1992 04:12

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baalke@kelvin.jpl.nasa.gov (Ron Baalke) writes:

>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. 

[other examples deleted]

Flyby the "back" of a planet (relative to it's orbital motion) and you speed up.
Flyby the "front" of a planet and you'll slow down.
Both techiniques are useful.  

-- 
Josh Hopkins                                          jbh55289@uxa.cso.uiuc.edu

"We can lick gravity, but the paperwork's a bit tougher."  Wernher von Braun

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From: jbh55289@uxa.cso.uiuc.edu (Josh 'K' Hopkins)
Subject: Re: Gravity Assists (Was Re: Query Re: pluto direct)
References: <719132495.F00003@blkcat.UUCP> <1992Oct30.163302.15547@rcvie.co.at> <1992Oct30.214251.17617@elroy.jpl.nasa.gov>
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Date: Sun, 1 Nov 1992 04:12:48 GMT
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