(307261) 2002 MS4 is a large trans-Neptunian object (TNO) the second-largest known object in the Solar system without a name after 2007 OR10. It was discovered in 2002 by Chad Trujillo and Michael E. Brown. It is classified as a cubewano by the Minor Planet Center.Mike Brown’s website lists it as nearly certain to be a dwarf planet. The Spitzer Space Telescope estimated it to have a diameter of 726±123 km.
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