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I'm trying to think of a good word for an asteroid/planetoid that has no stable orbit but has been ejected from a system and is passing close to a sun. Any help?

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See nnnnnn's comment below.

The NASA website, describing 'oumuamuam, uses the term "interstellar object." Extrasolar asteroid would seem to be another option. I haven't seen a unique word different from asteroid that originated outside of the solar system.

It seems a simple prefix is sufficient to describe objects beyond the solar system, i.e. exoplanet.

Scienfitic American has an article which uses the term "interstellar object."

Also, see answers to:

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    $\begingroup$ Isn't exoplanet normally used to describe planets that orbit stars other than our Sun? As compared to rogue planets, which do not orbit a star. $\endgroup$ – nnnnnn Dec 1 at 1:39
  • $\begingroup$ @nnnnnn Yup, you are right. You should write that as an answer and not just as a comment. $\endgroup$ – Bob516 Dec 1 at 1:46
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    $\begingroup$ Well I don't think it is a complete answer because it doesn't apply to smaller objects. I guess rogue could also be applied to asteroids and so forth, but I didn't post an answer because I don't have sources I can quote to back that up. $\endgroup$ – nnnnnn Dec 1 at 1:58

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