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}} , also written as 1995 SN55, is a lost centaur with a perihelion greater than Jupiter and a semi-major axis that may be less than Neptune's. This object could be the largest known centaur.
Size If is confirmed to have the orbit of a centaur, it will be one of the largest centaurs known. Centaurs typically have an albedo of about 0.07.[1] With an absolute magnitude (H) of 6.0,[2] and using an average centaur albedo of 0.07,[1] could be 310 km in diameter. The two largest known centaurs are 10199 Chariklo (260 km / H=6.4 / albedo = 0.05) and 2060 Chiron (230 km / H=6.5 / albedo = 0.07). Lost was only observed 14 times over 36 days from September 20, 1995 until October 26, 1995.[2][3] Due to this short observation arc, the object has a very poorly known orbit and is considered lost. (See Lost comet or Lost asteroid.) JPL shows this object having an aphelion distance of only 39.1 AU,[2] while the Deep Ecliptic Survey (DES) shows it having an aphelion distance of 91 AU.[3] References External links ja:1995 SN55 fi:1995 SN55
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