| Minorplanet: | yes |
| Background: |
|
| Discovered: | 8 October 2005 |
| Mp Category: | 3:5 resonant TNO |
| Orbit Ref: | [1] |
| Epoch: | 13 January 2016 (JD 2457400.5) |
| Semimajor: | 42.30237AU |
| Perihelion: | 32.11131AU |
| Aphelion: | 52.49343abbr=onNaNabbr=on |
| Eccentricity: | 0.24091 |
| Period: | 275.14 yr (100495 d) |
| Inclination: | 2.17385° |
| Asc Node: | 179.25692° |
| Arg Peri: | 224.79728° |
| Dimensions: | 85–240 km |
| Abs Magnitude: | 7.3 |
| Mean Motion: | /day |
| Observation Arc: | 1805 days (4.94 yr) |
| Uncertainty: | 4 |
| Moid: | 31.1197AU |
| Jupiter Moid: | 27.1241AU |
(provisional designation 2005 TN74) is a trans-Neptunian object (TNO)[2] in a 3:5 resonance with Neptune.[3] [4] It was discovered by Scott S. Sheppard and Chadwick A. Trujillo in 2005.
It was initially suspected of being a Neptune trojan since the first observations gave it a semi-major axis of 30 AU and an orbital eccentricity of 0.16,[5] but further observations showed it to have a semi-major axis of 42.7 AU, a perihelion of 32.1 AU, and an aphelion of 53.4 AU.[1]
With an absolute magnitude of 7.2,[1] it has an expected diameter in the range of 85 to 240 km.[6]
It has been observed 19 times over four oppositions.[1]