Other than Pluto's moons (including Charon), which known body comes closest to Pluto, and how close? Neptune doesn't come closer than 16 au. What about Orcus, whose orbit is similar to Pluto's, or another dwarf planet?

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    $\begingroup$ Technically, many, many small Kuiper belt objects enter Pluto's Hill Sphere (or sphere of influence SOI) every day. So those would be the ones closest, but I think you are talking about large, major objects. $\endgroup$ – fasterthanlight Jan 19 at 14:01
  • $\begingroup$ @fasterthanlight I'm asking "which known body". This may include asteroids like Arrokoth. $\endgroup$ – Plutos Loyer Jan 19 at 14:27
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    $\begingroup$ Stupid pedantic answer: Pluto, 0 au. $\endgroup$ – user253751 Jan 19 at 15:07
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    $\begingroup$ @user253751 You're beginning to sound like you are trolling the OP. If that's not your intent then I'd suggest just dropping this minor issue. $\endgroup$ – StephenG Jan 19 at 19:51
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    $\begingroup$ @user253751 I see that. I'm just encouraging both of you to let it go as a joke that did not work out. It happens me too. $\endgroup$ – StephenG Jan 19 at 20:07

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