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Discovery[1]
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| Discovered by | Kleyna, J., Sheppard, S. S., Jewitt, D. C. |
| Discovery date | 2001-12-11 |
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Designations
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| MPC designation | (131697) 2001 XH255 |
| Minor planet category |
Trans-Neptunian object 4:5 resonance[2][3] |
| 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° |
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Physical characteristics
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| 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]
(131696) 2001 XT254 and (95625) 2002 GX32 have also been visually shown to librate, but in the 3:7 resonance with Neptune.
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