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…
<queqiao->
⟨jonpc042⟩ How do you figure out where to put a correction burn on an interplanetary trajectory?
<queqiao->
For example, I'm heading to Jupiter and I want to adjust my heading to flyby ganymede (for a gravity capture), but adjusting my heading where I'm currently at is prohibitively expensive.
<queqiao->
⟨womby_⟩ I don't know if a gravity capture is possible in RSS
<queqiao->
⟨womby_⟩ ganymede is big but it's not that big
<queqiao->
⟨womby_⟩ compared to tylo (when adjusting for real scale) its tiny
<queqiao->
⟨jonpc042⟩ Huh, did not know that
<raptop>
Jool is a light Saturn orbited by 3 terrestrial planets (also Bop and Pol), while Jupiter... isn't
<queqiao->
⟨jonpc042⟩ I've been told jupiter requires a relatively small amount of dV to capture at, though I'm not entirely sure how much exactly, so I assumed a gravity assist from a large moon would suffice
<queqiao->
⟨jonpc042⟩ I'm on trajectory to flyby jupiter and have about 5.5km/s dV remaining, is this a reasonable budget for capturing and then completing a flyby of all of jupiter's moons?
<queqiao->
⟨jonpc042⟩ This is a really hard question to answer with planners it seems
<queqiao->
⟨womby_⟩ I mean if you just want to flyby probably
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<queqiao->
⟨Joshua Wood⟩ If you want to figure out where to put the correction burn I start at the sun AN/DN usually
<queqiao->
Add a few m/s of dv in the correct direction then use the time slider to move it around untill that amount of dv does the most work
<queqiao->
If it’s prograde/retrograde it’s usually ASAP is best
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<queqiao->
⟨butcher6994⟩ Possibly, you can capture for relatively little if you're ok with a very eccentric orbit. Then use gravity assists to modify your orbit
<queqiao->
⟨butcher6994⟩ Saturn is easier in some ways due to Titan
<queqiao->
⟨clayel⟩ clipper is doing a capture iirc, although its into a highly eccentric orbit
<queqiao->
⟨GoForPDI (less drag=more faster)⟩ iirc you have to capture into a highly eccentric orbit propulsively and then brake down using lots of gravity assists
<queqiao->
⟨Joshua Wood⟩ probably helps having a whole team of people and months to plan all the assists haha