7066 Nessus
7066 Nessus is a centaur (a type of icy planetoid) that was found by David L. Rabinowitz, working with Spacewatch, at Kitt Peak on April 26 1993. It was the second centaur found by him (5145 Pholus being his first), and the third centaur to be found (2060 Chiron was the first). It was officially announced on May 13, 1993 in IAUC 5789 with designation 1993 HA2.
| Discovery | |
|---|---|
| Discovered by | David L. Rabinowitz |
| Discovery date | April 26, 1993 |
| Designations | |
| 1993 HA2 | |
| Centaur | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 5607.451 Gm (37.483 AU) |
| Perihelion | 1769.167 Gm (11.826 AU) |
| 3688.309 Gm (24.655 AU) | |
| Eccentricity | 0.520 |
| 44714.802 d (122.42 a) | |
Average orbital speed | 5.57 km/s |
| 43.762° | |
| Inclination | 15.647° |
| 31.216° | |
| 170.814° | |
| Physical characteristics | |
| Dimensions | 60±16 km[2][3] |
| Mass | ~1.6×1017 kg |
Mean density | 2.0? g/cm³ |
Equatorial surface gravity | ~0.0148 m/s² |
Equatorial escape velocity | ~0.0280 km/s |
Sidereal rotation period | ? d |
| ?° | |
Pole ecliptic latitude | ? |
Pole ecliptic longitude | ? |
| 0.06[2] | |
| Temperature | ~56 K |
| ? | |
| 9.6[1] | |
Orbit
Nessus finishes one orbit around the Sun in 122.4 years, an eccentricity of 0.52 and an inclination to the ecliptic of 15.6 degrees. At perihelion (closest approach to the Sun), it moves closer to the Sun than Uranus, while at aphelion (farthest approach to the Sun) it goes even farther than Neptune.
The orbits of centaurs change from time to time because of interactions with the giant planets. Nessus is thought to have a fairly long orbital half-life of about 4.9 Myr.[4]
References
- ↑ 1.0 1.1 "JPL Small-Body Database Browser: 7066 Nessus (1993 HA2)". May 26, 2004. Retrieved September 5, 2008.
- ↑ 2.0 2.1 Stansberry, John; Grundy, Will; Brown, Mike; Cruikshank, Dale; Spencer, John; Trilling, David; Margot, Jean-Luc (20 February 2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope" (in en). .
- ↑ Johnston, Wm. Robert (August 22, 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved September 5, 2008.
- ↑ Horner, J.; Evans, N. W.; Bailey, M. E. (November 1, 2004). "Simulations of the population of Centaurs – I. The bulk statistics". Monthly Notices of the Royal Astronomical Society. 354 (3): 798–810. doi:10.1111/j.1365-2966.2004.08240.x. ISSN 0035-8711. S2CID 16002759. Retrieved June 24, 2022.
Other websites
- Orbital simulation from JPL (Java) / Ephemeris
- Spacewatch Archived October 28, 2004, at the Wayback Machine
- Asteroid/Comet connection Archived May 16, 2006, at the Wayback Machine
- The Centaur Research Project Archived 2019-09-23 at the Wayback Machine
- Astrological keywords for Nessus
