I know the planets Mars and Eris are among bodies that have the most Earth-like mean solar days (about 24.67 and 25.9 hrs). Among moons there is Mimas of Saturn which has one of the most Earth-like days. Uranus and Neptune also have more Earth-like day lengths than many other known planets or moons. However I don't know of a body in the Earth's planetary system that would have a more Earth-like solar day than Mars (other than the Earth of course). Do you know a planet, moon or asteroid that has a daylength closer to that of Earth than Mars' is?
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1$\begingroup$ Have you tried using the JPL Small-Body Database Search Engine? It allows for filtering on rotation period. $\endgroup$– user24157Feb 22, 2020 at 23:59
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2 Answers
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Methone, a tiny moon of Saturn has an orbital period of 1.01 days. This is approximately 24 hrs and 14 minutes. Ref. 1
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Makemake
It is a dwarf planet in the Kuiper Belt that has a day that is close to Earth's. One day on Makemake is 22.48 hours. https://solarsystem.nasa.gov/planets/dwarf-planets/makemake/in-depth/
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$\begingroup$ That daylength is close to that of the moon Mimas. However it's farther than Mars' solar day. I'd like to know whether there's a known body whose day resembles the Earth's more than the Martian day of about 24.67 hrs (mean Solar day on Mars). $\endgroup$ Feb 22, 2020 at 19:03
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$\begingroup$ Hi @DeanPitts
+1and Welcome to Stack Exchange! Can you cite a source or add a link or at least explain why you think this is 1) true and 2) the answer to the question? (i.e. " closest to that of Earth") Thanks! $\endgroup$– uhohFeb 23, 2020 at 3:07 -
$\begingroup$ solarsystem.nasa.gov/planets/dwarf-planets/makemake/in-depth $\endgroup$ Feb 23, 2020 at 3:23