Jupiter flagship selected |
Jupiter flagship selected |
Feb 18 2009, 03:47 PM
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Member Group: Members Posts: 706 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117 |
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Feb 18 2009, 07:54 PM
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
Ralph, I figure the JS assist opportunities out to recur every 20 years, because 1/(1/12 - 1/29.5) = 20.2. That doesn't say how long the launch window stays open, though, but is it as much as three years?
--Greg |
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Feb 19 2009, 09:29 PM
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#3
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Member Group: Members Posts: 613 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
Ralph, I figure the JS assist opportunities out to recur every 20 years, because 1/(1/12 - 1/29.5) = 20.2. That doesn't say how long the launch window stays open, though, but is it as much as three years? --Greg You're right. I guess how wide the flyby window (depending on the number of revs and Venus/Earth encounters, launch could be any time) depends on the flight speed range, but I bet it is close to 3 years (e.g. Cassini had windows in 1995, 1996 and 1997). So 2031/2032 might be the earliest useful timeframe, but someone actually needs to figure out a real trajectory. On the other hand, in that rosy future, maybe we wont need flybys because we'll have better propulsion, aerocapture etc.... (and Titan Explorer 2007 and TSSM managed without flybys anyway) |
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