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Could two identical or slightly different planets (or planet-like objects if you want to be pedantic) form a binary pair that then orbit some other larger gravitic object (like a star)?

I was inspired by Could twin planets exist and share the same orbit? which I thought initially was asking the question I'm asking, but wasn't.

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    $\begingroup$ Does Pluto-Charon qualify for your question? Charon's diameter is about half Pluto's, and 1/10 the mass. Their orbital center is outside of Pluto, and they orbit the sun. $\endgroup$
    – Russell Borogove
    Commented Oct 5, 2015 at 13:37

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It appears what you are describing is a double planet. There are no examples that we know of where the two planets are practically identical, but I do not believe there is anything prohibiting such an occurrence.

See https://en.wikipedia.org/wiki/Double_planet

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  • $\begingroup$ You really should mention Pluto/ Charon, they are a double planet by most standards (Or double dwarf planet, at least...) $\endgroup$
    – PearsonArtPhoto ♦
    Commented Oct 6, 2015 at 1:55

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