10:27 <Webchat660> Are there specific launch windows one has to follow in principia from places like Cape Canaveral to get to the Moon?

10:35 <UmbralRaptop> Most of the time launches from Cape Canaveral need off-plane intercepts (hence why egg et al will recommend starting from Kourou or the like)

10:37 <Webchat660> Oh, how much extra delta-v does an offplane intercept require?

10:37 <Webchat660> Cause I noticed it requires probably more than 4000 m/s

10:38 <Webchat660> Which annoys me since the delta-v calculator I got doesn't calculate the offplane intercept delta-v requirements

10:59 <Webchat660> Umh, I have a problem, I can't launch from Korou because it only has a level 1 launchpad

11:02 <Webchat660> I just destroyed my savefile by accidentally building launchpads which will never finish

11:02 <UmbralRaptop> 4 km/s extra sounds like trying to do a large plane change in LEO?

11:05 <Webchat660> No, i'm not talking about that, I'm talking about the delta-v requirements for an offplane TLI are more than for a normal TLI, but Don't know how much, so I assumed it was typically at like 4km/s

11:06 <Webchat660> Since I got like 3.508 km/s of delta-v on my TLI stage

11:07 <Webchat660> And the principia node only getting close to the Moon requires lots of binormal.

11:12 <Webchat660> so, I mean 3.508 km/s + like 1 or 2 more km/s

11:48 <_whitenotifier> [Principia] Growflavor edited a comment on issue #3064: possible steady memory increase potentially leading to KSP instability/slowness/unusual texture lighting/slow crash - https://git.io/JEnZn

11:49 <_whitenotifier> [Principia] Growflavor edited a comment on issue #3064: possible steady memory increase potentially leading to KSP instability/slowness/unusual texture lighting/slow crash - https://git.io/JEnZn

11:50 <Webchat660> Hey, what happens if one removes principia from an already existing ksp savefile?

16:09 <egg|anbo|egg_> oh the bot is down

16:10 <queqiao-> ⟨e​gg⟩ raptop: <https://cdn.discordapp.com/attachments/480397772248580098/880120762692931604/butcher_orbits.png>

16:12 <queqiao-> ⟨e​gg⟩ the two views at the top have the ecliptic horizontal and ecliptic north up, the bottom view is looking down onto the ecliptic

16:13 <queqiao-> ⟨e​gg⟩ (well, orbital plane of mercury, rather than ecliptic)

16:13 <queqiao-> ⟨e​gg⟩ (technically equator of mercury but they are practically the same)

16:49 <raptop> Butcher's craft is definitely doing some odd things

17:06 <queqiao-> ⟨S​ir Mortimer⟩ Will that craft cease to orbit mercury at some point?

17:07 <queqiao-> ⟨e​gg⟩ Towards the end of 1971 it runs into Mercury, which puts an end to the orbit

17:08 <queqiao-> ⟨e​gg⟩ If Mercury didn't have that pesky surface, no. This perturbation does not change the orbital energy.

17:09 <queqiao-> ⟨S​ir Mortimer⟩ So lithobrake it will, but otherwise it would never leave

17:09 <queqiao-> ⟨e​gg⟩ (the semimajor axis varies by maybe 300 m over the 6-year adventure, it is very constant)

17:09 <queqiao-> ⟨S​ir Mortimer⟩ Decidedly interesting orbit.

17:10 <queqiao-> ⟨e​gg⟩ See https://github.com/mockingbirdnest/Principia/pull/3113 for more plots

17:10 <queqiao-> ⟨e​gg⟩ Also see the comments in the test for references

17:12 <queqiao-> ⟨e​gg⟩ ```C++

17:12 <queqiao-> ⟨e​gg⟩ // The conservation of the “тривиального интеграла a = const” [Лид61, p. 25]

17:12 <queqiao-> ⟨e​gg⟩ // is excellent: while the sun is nudging and deforming the orbit, it is not

17:12 <queqiao-> ⟨e​gg⟩ // pumping energy into nor out of it.

17:12 <queqiao-> ⟨e​gg⟩ EXPECT_THAT(elements.mean_semimajor_axis_interval().min,

17:12 <queqiao-> ⟨e​gg⟩ IsNear(14'910.0_⑴ * Kilo(Metre)));

17:12 <queqiao-> ⟨e​gg⟩ EXPECT_THAT(elements.mean_semimajor_axis_interval().max,

17:12 <queqiao-> ⟨e​gg⟩ IsNear(14'910.3_⑴ * Kilo(Metre)));

17:12 <queqiao-> ⟨e​gg⟩

17:12 <queqiao-> ⟨e​gg⟩ // The integral c₁ is preserved quite well: we have an exchange between

17:12 <queqiao-> ⟨e​gg⟩ // inclination and eccentricity.

17:12 <queqiao-> ⟨e​gg⟩ EXPECT_THAT(c₁.min, IsNear(0.042_⑴));

17:12 <queqiao-> ⟨e​gg⟩ EXPECT_THAT(c₁.max, IsNear(0.050_⑴));

17:12 <queqiao-> ⟨e​gg⟩

17:12 <queqiao-> ⟨e​gg⟩ // The integral c₂ is also conserved: the long-term evolution of the orbital

17:12 <queqiao-> ⟨e​gg⟩ // elements is as described in [Лид61].

17:12 <queqiao-> ⟨e​gg⟩ EXPECT_THAT(c₂.min, IsNear(-0.091_⑴));

17:12 <queqiao-> ⟨e​gg⟩ EXPECT_THAT(c₂.max, IsNear(-0.083_⑴));

17:12 <queqiao-> ⟨e​gg⟩ ```

18:49 <queqiao-> ⟨D​0m1nu2⟩ Hey, could anyone help me with getting initial state of Eros and Mathilde asteroid please? 🙂

18:55 <raptop> Something like https://photos.app.goo.gl/r5mVkgXKJdpY2mnA8 ?

19:14 <raptop> So, uh, does that help with orbital elements for their initial states?

19:15 <queqiao-> ⟨D​0m1nu2⟩ Yeah, thanks! Sorry for long respond time had to do some work.

19:41 <raptop> ah, fair enough

20:02 <queqiao-> ⟨D​0m1nu2⟩ Guess I'm not capable of making configs planets/asteroids. Is there Real Expansion(https://forum.kerbalspaceprogram.com/index.php?/topic/184530-13x-18x-real-expansion/) for Principia by any chance?

21:14 <queqiao-> ⟨D​0m1nu2⟩ Guess I'm not capable of making configs planets/asteroids. Is there Real Expansion(https://forum.kerbalspaceprogram.com/index.php?/topic/184530-13x-18x-real-expansion/) and MPL(https://forum.kerbalspaceprogram.com/index.php?/topic/192848-181-planet-pack-minor-planets-expansion/) for Principia by any chance? Only Eros and Mathilda. Don't need anymore. (edited)

21:28 <queqiao-> ⟨N​ewfieStargazer⟩ How accurate will interplanetary transfer planning be using Principia, a “probe” in a plain (9.74 degrees relative inclination) of the moon, and using Mechjeb Maneuver Planner - Advanced transfer to another planet?