2017 MB7
2017 MB7 is a trans-Neptunian object and damocloid on a cometary-like orbit from the outer Solar System, approximately 6 kilometers (4 miles) in diameter. It was first observed on 22 June 2017 by the Pan-STARRS survey at Haleakala Observatory in Hawaii, United States. This unusual object has the largest heliocentric aphelion, semi-major axis, orbital eccentricity and orbital period of any known periodic minor planet, even larger than that of 2014 FE72; it is calculated to reach several thousand AU (Earth-Sun) distances at the farthest extent of its orbit.
Highly eccentric orbit of 2017 MB7 | |
| Discovery | |
|---|---|
| Discovered by | Pan-STARRS 1 |
| Discovery site | Haleakala Obs. |
| Discovery date | 22 June 2017 (first observed only) |
| Designations | |
MPC designation | 2017 MB7 |
Minor planet category | TNO · damocloid unusual · distant |
| Orbital characteristics | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 174 days |
| Aphelion | 3,419±89 AU |
| Perihelion | 4.458 AU |
Semi-major axis | 1,712±45 AU |
| Eccentricity | 0.9974 |
Orbital period (sidereal) | 70,825±2,767 yr |
Mean anomaly | 0.0181° |
Mean motion | 0° 0m 0.05s / day |
| Inclination | 55.724° |
Longitude of ascending node | 58.247° |
| 80.627±0.002° | |
| TJupiter | 1.477 |
| Physical characteristics | |
Mean diameter | 6 km (assumed) |
| 0.09 (assumed) | |
| 14.156±0.332 14.2 | |
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