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1995 Sn55

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Title: 1995 Sn55  
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1995 Sn55

1995 SN55
Discovery and designation
Discovered by A. Gleason
Discovery date September 20, 1995
MPC designation 1995 SN55
Minor planet category Centaur[1][2]
Orbital characteristics[1][3]
Epoch September 20 1995 (2449980.5)
Aphelion 39.1 to 91 AU (Q)
Perihelion 7.9 to 8.3 AU (q)
Semi-major axis 23.5 to 49 AU (a)
Eccentricity 0.66 to 0.83
Orbital period 114 to 351 yr
Mean anomaly 180.2° (M)
Inclination 4.97°
Longitude of ascending node 144.6°
Argument of perihelion 49.3°
Physical characteristics
Dimensions 310 km?[4]
Geometric albedo 0.07 (assumed)[4][5]
Absolute magnitude (H) 6.0[1]

1995 SN55, 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.


If 1995 SN55 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.[5] With an absolute magnitude (H) of 6.0,[1] and using an average centaur albedo of 0.07,[5] 1995 SN55 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).


1995 SN55 was only observed 14 times over 36 days from September 20, 1995 until October 26, 1995.[1][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,[1] while the Deep Ecliptic Survey (DES) shows it having an aphelion distance of 91 AU.[3]


External links

  • Ephemeris
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