Author Topic: looking for Launch windows data for Mars from 1980s to 2000s  (Read 1224 times)

Offline Michel Van

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like title say
For Alternate history stories,
i need Launch window data toward Mars from 1980s to 2000s

Know someone, were i find that information Online ?

Offline kevin-rf

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I would start on wiki, it lists all windows a launch occurred in. Since they are spaced every 26 or so months, you should be able to fill in the gaps.

https://en.wikipedia.org/wiki/Exploration_of_Mars

Quote
The minimum-energy launch windows for a Martian expedition occur at intervals of approximately two years and two months (specifically 780 days, the planet's synodic period with respect to Earth).[9] In addition, the lowest available transfer energy varies on a roughly 16-year cycle.[9] For example, a minimum occurred in the 1969 and 1971 launch windows, rising to a peak in the late 1970s, and hitting another low in 1986 and 1988.[9]
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It's your med's!

Offline Archibald

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... that ackward moment when you realize that Jeff Bezos personal fortune is far above NASA annual budget... 115 billion to 18 billion...

Offline Michel Van

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Thanks, kevin-rf for the info
i hope to avoid this kind of long calculations, by looking into a list. 

Thanks, Archibald for that list
i can made rough estimation

like Oppositions of Mars on 1997 Mar 17 =
Mars 96 launch 1996 Nov 16, arrival on 1997 Sep 12 after 10 months flight.
had the Block-D worked correctly....

Offline Michel Van

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Technological requirements common to manned planetary missions. Appendix A - Mission requirements
Performance requirements common to manned mission objectives and modes for Mercury, Venus, Mars, Jupiter/Ganymede, and asteroids Ceres and Vesta

this PDF feature launch Windows, needed speeds, arrival date from 1960s to 1980s

Source

https://ntrs.nasa.gov/search.jsp?R=19680009358

Offline Archibald

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Dang, my link is dead.

I remember that von Braun 1969 Mars plan had the following dates
- November 12, 1981: Earth departure
- August 9, 1982: Mars orbit (the landing should have been August 13, 1982)
- February 14, 1983: Venus swingby to cut reentry speed
- August 15, 1983: splashdown and recovery.

... that ackward moment when you realize that Jeff Bezos personal fortune is far above NASA annual budget... 115 billion to 18 billion...

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