egg|anbo|egg changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is 陈景润. We currently target 1.2.2, 1.3.0, and 1.3.1. <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/
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<awang>
egg: Does Principia get rid of the lines that indicate where the ascending/descending nodes are on a target orbit?
<awang>
If so, what should I use as a replacement?
<egg|cell|egg>
Yes, appropriate reference frames
<egg|cell|egg>
Read the doc or ping me after work
<awang>
I'll probably have to ping you then
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<egg>
awang: what are you trying to do
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<awang>
egg: I'm trying to get a probe into a lunar orbit, and impact the TLI stage
<awang>
At this point, the minimum inclination I can get with respect to the Moon's orbit is ~4.5 degrees, I think
<egg>
awang: in the two-body frames, you have nodes
<egg>
use those
<awang>
I can burn for the Moon about a half hour after launch, but it requires almost a kilometer per second binormal component, which seems a bit high
<awang>
The AN/DN markers?
<egg>
yes
<awang>
Hmmm
<awang>
How would I ensure the Moon would be in the right place after a burn at an ascending/descending node?
<awang>
Wait for the node to approximately be on the Earth-Moon line?
<egg>
wat
<egg>
what do you mean
<egg>
what do you mean the moon in the right place
<awang>
Uh
<awang>
So I can burn towards the Moon's orbit at an ascending/descending node, but I'm thinking that the Moon may be in the wrong place in its orbit
<egg>
awang: yes, but there's the flight planning tool for that? also I don't see why you think the stock line would help you (aside from the fact that it makes no sense in the rotating frames)
<awang>
True, I just find the flight planning tool sort of annoying to use for anything that requires waiting for more than a few hours since that requires bumping up max steps per segment, and my computer is suffering a lot as is
<awang>
Well, what I was thinking for the stock line was that I could just timewarp until the Moon was a few days off of the line. Then I could be reasonably sure that when I burn at AN/DN the Moon would be in about the right place
<egg>
awang: well you can look at what angle the moon makes wrt the earth at your chosen node
<egg>
and that's going to be the same information, since that angle is an invariant of the frame
<awang>
I see
<awang>
That makes sense
<awang>
Wow
<awang>
Now I'm getting a Moon impact with a simple ~3130 m/s burn
<awang>
That was... simple
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<awang>
Thanks for the help!
<egg>
\o/
<egg>
awang: the invariants of the reference frame are your friends, learn them :-)
<egg>
awang: people in the fora seem really happy with the target LVLH frame for rendez-vous, that's nice
<awang>
egg: Nothing quite beats experience for learning those kinds of things :P
<awang>
Can't wait for the rendezvous contracts so I can experience the magic for myself
<GH>
[Principia] pleroy opened pull request #1635: Remove references to #228 (master...228) https://git.io/vbU6n
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<GH>
[Principia] eggrobin opened pull request #1636: Interpolation is not trivial when we are not interpolating at a node (master...emit-all-tables) https://git.io/vbUQ6