Author Topic: Lunar orbits  (Read 3102 times)

Offline Peter B

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Lunar orbits
« on: February 23, 2016, 07:22:23 AM »
Given that only Apollo 11 landed near the lunar equator, obviously the later landing missions had to enter orbits of the Moon prior to landing which were inclined to the lunar equator.

What I was wondering was (and I'm going to apologise now for my lack of correct technical terminology) did the orbit's maximum latitude match the latitude of the landing site?

What I'm trying to get my head around is this: during PDI were the LMs always travelling west, with the Sun behind them and their shadow pretty much directly ahead of them? Or was it that (particularly for A15 and A17) they were travelling at a detectably different angle with their shadow noticeably off to one side?

The reason I'm asking is to get a sense of what PDI and landing for a Tycho mission would have been like, after reading this article: http://www.wired.com/2012/03/apollo-mission-to-tycho-1969/

Thanks very much.
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Offline onebigmonkey

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Re: Lunar orbits
« Reply #1 on: February 23, 2016, 07:34:06 AM »
You can get an idea of some of the orbits by looking at the photographs they took from it, which I've plotted:

http://onebigmonkey.com/apollo/kmz/apollokmz.html

I think I also plotted the rough trajectory of the final approaches to landing based on the 16mm footage :)

Offline gwiz

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Re: Lunar orbits
« Reply #2 on: February 23, 2016, 08:58:07 AM »
Inclinations were usually a bit higher than landing latitude and significantly so for Apollo 14, presumably to aid mapping for later missions.
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Offline smartcooky

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Re: Lunar orbits
« Reply #3 on: February 23, 2016, 01:39:42 PM »
You can get an idea of some of the orbits by looking at the photographs they took from it, which I've plotted:

http://onebigmonkey.com/apollo/kmz/apollokmz.html

I think I also plotted the rough trajectory of the final approaches to landing based on the 16mm footage :)


All your links appear to go to a webhosting error 404 page

http://error404.000webhost.com/?


except the two at the bottom, which go to WSODs

http://onebigmonkey.com/apollo/kmz/index.html
« Last Edit: February 23, 2016, 01:44:09 PM by smartcooky »
If you're not a scientist but you think you've destroyed the foundation of a vast scientific edifice with 10 minutes of Googling, you might want to consider the possibility that you're wrong.

Offline Willoughby

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Re: Lunar orbits
« Reply #4 on: February 23, 2016, 01:42:09 PM »
You can get an idea of some of the orbits by looking at the photographs they took from it, which I've plotted:

http://onebigmonkey.com/apollo/kmz/apollokmz.html

I think I also plotted the rough trajectory of the final approaches to landing based on the 16mm footage :)

All you links appear to go to a webhosting error 404 page

http://error404.000webhost.com/?

I had the same issue.  All links broken it appears.