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Somewhat related, would be nice if they'd order Juno to be rerouted to check out interstellar comet 3I-Atlas, has to be done before the end of the month. Juno is slated to be deorbited into Jupiter in September so has no actual science left to do but probably enough fuel remaining for the rendesvous.
It's a fantastic idea, really clever. But I'm afraid it's too late, it doesn't have the necessary Delta-V. We could have tried it if we had planned the mission a month ago, but at this point we just can't get there in time (We didn't know its trajectory a month ago, so it's a moot point). What it comes down to is this, to make a flyby it would need about 2.5k Delta V, Juno has about half that.
Also, we're not confident Juno's engines will light. We've previously refrained from using them for some planned manners because we recorded abnormalities the last time they were fired. There's a decent chance engines would explode if used again.
If we want to be able to take advantage of this kind of situation in the future, we'll need at least one of two things... More probes, just sitting around with more fuel to spare, or better detection abilities so we can find these objects with more time to get to them. I'm betting on the later approach.
What kind of trajectory is that assuming? The closest approach of 3l-Atlas to Jupiter is in March and will be 54 million km away. Is this end of the month timing to get it off of Jupiter's orbit and closer to 3l-Atlas's orbit? How will it achieve the 61km/sec intercept speed of the comet?
This would be a flyby, rather than orbiting, as that would take a lot more propellant. I'd assume they might use gravitational assist from Jupiter, but a more or less direct shot might be planned, not sure. 3I Atlas would be closest to Jupiter in early September, yes, coincidentally the same time Juno was expected to be deorbited. As far as achieving the velocity needed, there are some calculations yet to be done but apparently there could be enough propellant onboard to do it.
I heard about the intercept idea through The Angry Astronaut's youtube but there was a Congresswoman and some professors pushing it too.
(Angry Astronaut's recent video about an intercept mission) https://youtu.be/B6O7nuJcmpY