(128) Nemesis
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Asteroid (128) Nemesis |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 2.751 AU |
| eccentricity | 0.1247 |
| Perihelion - aphelion | 2.408 AU - 3.094 AU |
| Inclination of the orbit plane | 6.248 ° |
| Length of the ascending node | 76.4 ° |
| Argument of the periapsis | 302.7 ° |
| Time of passage of the perihelion | April 8, 2009 |
| Sidereal period | 4 a 205 d |
| Mean orbital velocity | 17.9 km / s |
| Physical Properties | |
| Medium diameter | 187.8 km |
| Albedo | 0.05 |
| Rotation period | 39 h |
| Absolute brightness | 7.5 likes |
| Spectral class | C. |
| history | |
| Explorer | JC Watson |
| Date of discovery | November 25, 1872 |
| Another name | 1952 HW 1 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(128) Nemesis is an asteroid of the main asteroid belt discovered by James Craig Watson on November 25, 1872 .
The heavenly body was named after Nemesis , the Greek goddess of righteous anger and retribution.
Nemesis ranges from 2.4 ( perihelion ) astronomical units to 3.1 astronomical units ( aphelion ) around the sun in 4.6 years . The orbit is 6.2 ° inclined to the ecliptic , the orbital eccentricity is 0.12.
Nemesis has a diameter of 188 km. It has a dark carbon-rich surface with an albedo of 0.05. It rotates around its own axis in 39 hours and thus has an exceptionally long period of rotation.