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(131697) 2001 Xh255

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Subject: List of minor planets/131601–131700
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(131697) 2001 Xh255

(131697) 2001 XH255
Discovered by Kleyna, J., Sheppard, S. S., Jewitt, D. C.
Discovery date 2001-12-11
MPC designation (131697) 2001 XH255
Minor planet category TNO
4:5 resonance[2][3]
Orbital characteristics[1]
Epoch November 30, 2008
Aphelion 37.363 AU (Q)
Perihelion 32.256 AU (q)
Semi-major axis 34.810 AU (a)
Eccentricity 0.07335
Orbital period 205.39 yr
Mean anomaly 301.70° (M)
Inclination 2.8632 °
Longitude of ascending node 323.08°
Argument of perihelion 222.19°
Physical characteristics
Dimensions 92 km (assumed)[4]
Albedo 0.09 (assumed)
Apparent magnitude 23.8[5]
Absolute magnitude (H) 8.8[1]

(131697) 2001 XH255, provisionally known as 2001 XH255, is a trans-Neptunian object (TNO) that has a 4:5 resonance with Neptune.[2]

It will come to perihelion in 2042.[1]

Assuming a generic TNO albedo of 0.09, it is about 92 km in diameter.[4]


According to the Deep Ecliptic Survey and Minor Planet Center, (131697) 2001 XH255 has a 4:5 resonance with Neptune.[2][3] It comes as close as 32.2 AU from the Sun and has a fairly low orbital eccentricity of 0.07 with an inclination of only 2.86 degrees.[1]

The Neptune 4:5 resonance keeps it more than 7 AU from Neptune over a 14000-year period.[6]

It has been observed 19 times over 4 oppositions and has an orbit quality code of 3.[1]


External links

  • Horizons Ephemeris
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