@tcn33 It’s not a planet unless Ceres, Haumea, Makemake, Eris, 2207OR10, Quaoar, Sedna, Orcus, 2002MS4 & Salacia are, too. +prob many more.
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@kchangnyt@astrokiwi In general not observationally. But know mass & density. Above a certain size, physics kicks in.
@DrFunkySpoon @astrokiwi Then it’s a fuzzy, arbitrary mass cutoff. Something slightly smaller still roundish (e.g. Vesta).
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@DrFunkySpoon@astrokiwi Composition also influences whether it can become round. -
@kchangnyt@astrokiwi True but we often have constraints on density. What we will never know is small body population in vicinity of exos. - 4 more replies
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