Petronius is a crater on Mercury. It has a diameter of . Its name was adopted by the International Astronomical Union (IAU) on the August 6, 2012. Petronius is named for the Roman author Petronius.
Petronius has a region of permanent shadow on much of its floor, which has a bright radar signature. This is interpreted to represent a deposit of water ice.PIA19411: Water Ice on Mercury, NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of WashingtonJohn K. Harmon, Martin A. Slade, Melissa S. Rice, 2011. Radar imagery of Mercury’s putative polar ice: 1999–2005 Arecibo results. Icarus, 211, p37-50. doi.org/10.1016/j.icarus.2010.08.007
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