| Minorplanet: | yes |
| Background: |
|
| Discovered: | 11 December 2001 |
| Orbit Ref: | [1] |
| Epoch: | 13 January 2016 (JD 2457400.5) |
| Aphelion: | 37.907abbr=onNaNabbr=on (Q) |
| Perihelion: | 32.339AU (q) |
| Semimajor: | 35.123AU (a) |
| Eccentricity: | 0.079253 (e) |
| Period: | 208.16 yr (76030.5 d) |
| Inclination: | 2.8512° (i) |
| Asc Node: | 323.17° (Ω) |
| Mean Anomaly: | 318.51° (M) |
| Arg Peri: | 217.87° (ω) |
| Dimensions: | 100 km (assumed)[2] |
| Albedo: | 0.09 (assumed) |
| Magnitude: | 23.6[3] |
| Abs Magnitude: | 8.2 |
| Mean Motion: | / day (n) |
| Observation Arc: | 4110 days (11.25 yr) |
| Uncertainty: | 3 |
| Moid: | 31.3433AU |
| Jupiter Moid: | 26.8986AU |
, provisionally known as 2001 XH255, is a trans-Neptunian object (TNO) that has a 4:5 resonance with Neptune.
It will come to perihelion in 2041.[1]
Assuming a generic TNO albedo of 0.09, it is about 100 km in diameter.[2]
According to the Deep Ecliptic Survey and Minor Planet Center, has a 4:5 resonance with Neptune. 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.[4]
It has been observed 21 times over 5 oppositions and has an orbit quality code of 3.[1]
A NASA study in 2019 that confirmed the viability of using small radioisotope or nuclear fission power systems combined with xenon electric propulsion for deep space exploration, used 2001 XH255 as a representative Kuiper Belt Object as the mission's destination to orbit.[5]