7066 Nessus
| Discovery | |
|---|---|
| Discovered by |
Spacewatch (D. Rabinowitz uncredited) |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 26 April 1993 |
| Designations | |
| MPC designation | 7066 Nessus |
|
Named after
|
Nessus (Greek mythology) |
| 1993 HA2 | |
| Centaur | |
| Adjectives | Nessian |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 4048 days (11.08 yr) |
| Aphelion | 37.281 AU (5.5772 Tm) |
| Perihelion | 11.76323 AU (1.759754 Tm) |
| 24.522 AU (3.6684 Tm) | |
| Eccentricity | 0.52030 |
| 121.44 yr (44354 d) | |
|
Average orbital speed
|
5.57 km/s |
| 72.524° | |
| 0° 0m 29.257s / day (n) | |
| Inclination | 15.66868° |
| 31.1557° | |
| 170.478° | |
| Earth MOID | 10.7544 AU (1.60884 Tm) |
| Jupiter MOID | 6.30351 AU (942.992 Gm) |
| Jupiter Tisserand parameter | 3.781 |
| Physical characteristics | |
| Dimensions | 60±16 km |
| 0.06 | |
| Temperature | ~ 56 K |
| ~ 23.4 | |
| 9.6 | |
7066 Nessus (/ˈnɛsəs/; from Greek: Νέσσος) is a centaur (a type of icy minor planet) that was discovered by David L. Rabinowitz, working with Spacewatch, at Kitt Peak on 26 April 1993. It was the second centaur found by him (5145 Pholus being his previous find), and the third centaur discovery (2060 Chiron, discovered by Charles Kowal in 1977, was the first). Nessus was officially announced on May 13, 1993, in IAUC 5789 with designation 1993 HA2.
7066 Nessus has an orbital period of 122.4 years, an eccentricity of 0.52 and an inclination to the ecliptic of 15.6 degrees. At perihelion, it moves much closer to the Sun than Uranus, while at aphelion it moves out well beyond the orbit of Neptune.
The orbits of centaurs are unstable due to perturbations by the giant planets. Nessus is an "SE object" because currently Saturn controls its perihelion and its aphelion is within the Edgeworth–Kuiper belt. Nessus is estimated to have a relatively long orbital half-life of about 4.9 Myr. Fifty clones of the orbit of Nessus suggest that Nessus will not pass within 1AU (150 Gm) of a planet for at least twenty thousand years.
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