egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <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…
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<queqiao--> <T​iv​ec​> if I want to set up geostationary orbit with Principia, how would I go about doing that? like, what kind of launch orbit would be typical etc. I suppose I want to launch to GTO with a very low periapsis and circularize with the satellite no?
<queqiao--> <T​iv​ec​> ok so, if i understand it right, this would be quite close to a geosynch orbit. the orbit analyser says i will be in a circular geostationary. how can i make it "smaller"? like, a smaller circle https://media.discordapp.net/attachments/480397772248580098/1366681986151878727/image.png?ex=6811d549&is=681083c9&hm=85425dde13d02b589d6105eefeedc74d1b5aa76870dc00951cf0a80c7ae06620&
<queqiao--> <T​iv​ec​> my god, it was insanely simple to achieve a geostationary orbit with Principia. i don't know if it is staying like that forever but it's a start 🙂 Now i just need to design the satellite for it 😄 launcher is capable of 1700kg to geostationary, that's a good start I think
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<queqiao--> Reply to "T​iv​ec​: ok so, if i understand it right, this would be quite close to a geosynch orbit. the orbit..."
<queqiao--> <J​D> H O W
<queqiao--> Reply to "T​iv​ec​: very neat looking orbit"
<queqiao--> <k​uz​in​at​0r​> I like how my trajectory evolves during the interplanetary burn. Literally a flower blooming
<queqiao--> Reply to "J​D: H O W"
<queqiao--> <T​iv​ec​> i launched to a parking orbit of 180x180km, then i burned tangent+ at the AN/DN to achieve 32786km orbit. now the particular orbit you see there is just a plan since the craft didn't have the equipment to circularize but.. it's about 1500m/s circularization with ECI manoeuvre frame, and i view it from the ECEF view 🙂
<queqiao--> <T​iv​ec​> to make the circle smaller and less oval, i played with normal and binormal until i got the shape i wanted 🙂
<queqiao--> Reply to "J​D: H O W"
<queqiao--> <r​ap​to​p ​| ​²³​⁹P​u ​po​we​re​d> The transfer orbit shape? You get weird things at times depending on what reference frame you're using
<queqiao--> <T​iv​ec​> the reason for the orbit up there is most probably because i have an inclined orbit
<queqiao--> <T​iv​ec​> also, it's really hard to get into a synch orbit if you launch inclined 😄 but i'm sure it's possible somehow
<queqiao--> Reply to "T​iv​ec​: i launched to a parking orbit of 180x180km, then i burned tangent+ at the AN/DN to achiev..."
<queqiao--> <M​me​ri​di​an​> You should be doing circ+plane change at apogee to insert into GEO, that combined burn is around ~1835dV
<queqiao--> Reply to "M​me​ri​di​an​: You should be doing circ+plane change at apogee to insert into GEO, that combined burn is..."
<queqiao--> <T​iv​ec​> yes, that's what i was planning there. i did burn at AN/DN to achive the apoapsis though, that way the dV needed to plane change was minimal
<queqiao--> Reply to "M​me​ri​di​an​: You should be doing circ+plane change at apogee to insert into GEO, that combined burn is..."
<queqiao--> <e​zs​na​ck​> Akshually its better to split the inclination change between the pe raise and the ap raise, how much depends on the starting inclination
<queqiao--> <p​in​ec​on​ez​> what was the inclination where bielliptic becomes better again? or does it depend too much on variable factors?
<queqiao--> <T​iv​ec​> my initial inclination was like 5.23 so it wasn't bad
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<queqiao--> Reply to "e​zs​na​ck​: Akshually its better to split the inclination change between the pe raise and the ap rais..."
<queqiao--> <B​ut​ch​er​> Actually from high inclination it can be better to boost up to very high apogee, do a plane change and pe raise there then circularise at perigee.
<queqiao--> <B​ut​ch​er​> I ran from Churchill and it really exposes all the fun stuff.
<queqiao--> Reply to "p​in​ec​on​ez​: what was the launch inclination where bielliptic becomes better again? or does it depend ..."
<queqiao--> <G​oF​or​PD​I ​(l​es​s ​dr​ag​=m​or​e ​fa​st​er​)> 45 degrees iirc
<queqiao--> Reply to "B​ut​ch​er​: Actually from high inclination it can be better to boost up to very high apogee, do a pla..."
<queqiao--> <e​zs​na​ck​> Even when doing that its still more efficient to do some plane change on the first burn tho
<queqiao--> <M​me​ri​di​an​> where tf do yall learn this stuff
<raptop> I mean, orbital mechanics textbooks exist (as do a number of useful websites)
<queqiao--> Reply to "M​me​ri​di​an​: where tf do yall learn this stuff"
<queqiao--> <s​ii​ma​v> NathanKell streams
<queqiao--> Reply to "s​ii​ma​v: NathanKell streams"
<queqiao--> <M​me​ri​di​an​> Where did he go?? I miss him 🥺
<queqiao--> Reply to "r​ap​to​p: I mean, orbital mechanics textbooks exist (as do a number of useful websites)"
<queqiao--> <M​me​ri​di​an​> I took two years of aerospace engineering but the intro orbital dynamics class doesn't seem to be enough lol
<queqiao--> <s​ii​ma​v> Doing Other Stuff™️, I guess
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