… thanks, Google. I guess

@mcc don't know if this is correct but at least it sussed the context...

https://www.wolframalpha.com/input?i=current+distance+from+europa+to+titan

elementary charge - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

@martin_fff I wasn't really asking the right question anyway, I was trying to get a distance between two Jovian moons and forgot Titan was Saturnine
@mcc @martin_fff I'd have thought that the distance between two Jovian moons would change moment by moment since they're both in orbit. Or did you mean the distance between their orbits?
@bodhipaksa @martin_fff Yes, or their distance at its shortest point (basically the same thing).
@mcc @martin_fff Do you mind if I ask why you wanted to know? (It’s an interesting question!)

@bodhipaksa @martin_fff I was earlier asking what it would take to make a GPS that covers the solar system https://mastodon.social/@mcc/110674497444151740

Someone proposed an approach but said it would only give a precision of 3500 miles. I was trying to get a sense of how far apart the moons of Jupiter or Saturn are to see how much precision you'd need in the worst case to at least determine the nearest astronomical body

(Possibly ignoring the degenerate case of the asteroid belt)

@mcc @bodhipaksa @martin_fff I was thinking about Janus and Epithemus, co-orbiting moons of Saturn, but they apparently never approach closer than 10,000 km https://en.wikipedia.org/wiki/Epimetheus_(moon)#Orbit . IIRC there are also some co-orbiting objects inside the ring system.
Epimetheus (moon) - Wikipedia