 Follow-up images of2010 KZ39 taken atLas Campañas Obs. | |
| Discovery[1][2][3] | |
|---|---|
| Discovered by |
|
| Discovery site | Las Campañas Obs. (first observed) |
| Discovery date | 21 May 2010 (first observed) |
| Designations | |
| 2010 KZ39 | |
| Orbital characteristics[4][5] | |
| Epoch 2025 November 21 (JD 2461000.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 11.94 yr (4,361 days) |
| Aphelion | 47.46 AU |
| Perihelion | 42.52 AU |
| 44.99 AU | |
| Eccentricity | 0.0549 |
| 301.8 yr (110,200 days) | |
| 256.7° | |
| 0° 0m 11.772s / day | |
| Inclination | 26.138° |
| 53.249° | |
| ≈ 6 May 2110[6] ±5 months | |
| 323.6° | |
| Knownsatellites | 0 |
| Physical characteristics | |
| 743 km?[11] 660 km (estimated albedo)[12] | |
| 0.10(assumed)[7] | |
| 20.7[13] | |
| |
2010 KZ39 is atrans-Neptunian object orbiting the Sun as adetached object in the outer reaches of theSolar System, estimated to be somewhere around 700 kilometres (400 miles) in diameter. The object was first observed on 21 May 2010 by astronomersAndrzej Udalski,Scott Sheppard, M. Szymanski andChad Trujillo at theLas Campañas Observatory in Chile.[1][3]
2010 KZ39 orbits the Sun at a distance of 42.5–47.5 AU once every 302 years, similar toMakemake,19521 Chaos and other bodies that circle the Sun in 6:11resonance toNeptune. Its orbit has aneccentricity of 0.055 and aninclination of 26° with respect to theecliptic.
Using the best-fit values for its orbit, it is expected to come toperihelion in 2109.[4] It has been observed 50 times over 12 years and has anuncertainty parameter of 4.[1] As of 2025, it is 45.677 AU from the Sun.[13] The body's spectral type as well as its rotation period remain unknown.
| Consensus | _(cropped).jpg)  | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Candidate (for TNOs, D+1σ ≥ 700 km or H ≤ 4.0) |
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