raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fréchet. We currently target 1.5.1, 1.6.1, and 1.7.x. <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly… | <egg> also 4e16 m * 2^-52 is uncomfortably large
<discord-_>
egg. — hmm
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egg. — you have a J2, but not a reference radius
<discord-_>
egg. — says the error message
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egg. — this is somewhat odd
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egg. — on stock you say?
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Damien. — yep
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egg. — and no other gravity models around?
<discord-_>
Damien. — no, I just added the config to test it out
<discord-_>
Damien. — clean install, latest release ver of principia
<discord-_>
Damien. — a few other mods but just QoL stuff and kerbalism
<discord-_>
Damien. — works fine without that config
<discord-_>
Damien. — CTDs on initialisation of a new save with it
<discord-_>
egg. — yeah looking at the code seems that reference_radius is not optional
<discord-_>
egg. — I think it used to be though
<discord-_>
Damien. — you happen to know the ref radius entry off the top of your head?
<discord-_>
egg. — reference_radius = <your choice, should be a radius that makes sense as the radius of the body for sanity>
<discord-_>
egg. — (for Earth you'd use the equatorial radius here)
<discord-_>
Damien. — yeah just reading the wiki, supposed to default to stock
<discord-_>
Damien. — radius given in m or km?
<discord-_>
Damien. — nvm found it
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egg. — @Damien whatever you want
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egg. — you can give it in astronomical units, microns, milimetres, centimetres
<discord-_>
Damien. — kerbin only 600km... that's tiny
<discord-_>
egg. — 4e-6 au
<discord-_>
Damien. — yeah adding that seemed to work, tthanks
<discord-_>
egg. — @Damien I'm wondering whether the documentation was ever correct or whether we broke somethnig
<discord-_>
egg. — somethnig
<discord-_>
egg. — I am good at this typnig thnig
<discord-_>
Damien. — hmm, I have no milestone contracts
<discord-_>
Damien. — somethnig broke
<discord-_>
egg. — That's probably not my fault, I don't touch contracts
<discord-_>
Damien. — yeah I know 🙂
<discord-_>
Damien. — it'll be contract configurattor
<discord-_>
Damien. — ah nvm it showed up now
<discord-_>
Damien. — must have been on a delay
<discord-_>
egg. — @Damien do you have a github account so I can @ you on an issue wrt reference_radius requiredness?
<_whitenotifier-d13c>
[Principia] eggrobin edited issue #2429: reference_radius does not appear to take a default value C#-side - https://git.io/Jexcd
<_whitenotifier-d13c>
[Principia] eggrobin edited issue #2429: reference_radius does not appear to take a default value C#-side - https://git.io/Jexcd
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<discord-_>
Acer_Saccharum. — I see in the gravity_model file there are some celestial bodies that have their J_2 defined as just j2 = ...
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Acer_Saccharum. — how would I go about converting other higher degree zonal harmonics to the sin and cos values I see in other entries in the gravity_model file
<discord-_>
Acer_Saccharum. — I see in the gravity_model file there are some celestial bodies that have their J_2 defined as just j2 = ... whereas others have a more complex syntax
<discord-_>
Acer_Saccharum. — how would I go about converting other higher degree zonal harmonics to the sin and cos values I see in other entries in the gravity_model file (edited)
<discord-_>
Acer_Saccharum. — are they just for longitude offsets?
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<discord-_>
egg. — C20 corresponds to J2
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<discord-_>
Acer_Saccharum. — So then would C40, C60, and C80 be the fourth, sixth, and eighth degree zonal terms?
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<discord-_>
Acer_Saccharum. — and if these harmonics are 'aligned with the polar/rotation axis", can I just throw the values in the cos = ... term leaving the sin = ... term as 0?
<discord-_>
Acer_Saccharum. — and if these harmonics are "aligned with the polar/rotation axis", can I just throw the values in the cos = ... term leaving the sin = ... term as 0? (edited)
<discord-_>
egg. — What are you trying to do
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<discord-_>
Acer_Saccharum. — I'd like to see what happens to orbits around planets that are sufficiently oblate for the j2 term alone to give inaccurate results, like what would happen around fast rotating or otherwise distorted minor planets or moons like Haumea and Mimas
<discord-_>
Acer_Saccharum. — I'd like to see what happens to orbits around planets that are sufficiently oblate/prolate for the j2 term alone to give inaccurate results, like what would happen around fast rotating or otherwise distorted minor planets or moons like Haumea and Mimas (edited)
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<_whitenotifier-d13c>
[Principia] pleroy opened pull request #2430: reference_radius defaults to radius in the configuration of an oblate body - https://git.io/Jexok
<discord-_>
egg. — You can just use Jn
<_whitenotifier-d13c>
[Principia] pleroy edited pull request #2430: reference_radius defaults to radius in the configuration of an oblate body - https://git.io/Jexok
<discord-_>
RurouniDonut. — So, doing the gravity hack trick to delete history on a couple of sats just sitting in their orbits made my save go from 208mb to 72mb
<discord-_>
RurouniDonut. — Noice
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<discord-_>
RurouniDonut. — Just got it down to 18mb hell yeah
<discord-_>
Acer_Saccharum. — @ egg great, that makes it much simpler
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<_whitenotifier-d13c>
[Principia] pleroy synchronize pull request #2430: reference_radius defaults to radius in the configuration of an oblate body - https://git.io/Jexok
<_whitenotifier-d13c>
[Principia] eggrobin labeled pull request #2430: reference_radius defaults to radius in the configuration of an oblate body - https://git.io/Jexok
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