128 Nemesis
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| Orbital characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) | |
|---|---|
| Orbit type | Main belt (Nemesian) |
| Semimajor axis | 2.750 AU |
| Perihelion distance | 2.399 AU |
| Aphelion distance | 3.101 AU |
| Orbital period | 4.56 years |
| Inclination | 6.25° |
| Eccentricity | 0.128 |
| Physical characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) | |
| Diameter | 188.2 km |
| Rotation period | 39 hours |
| Spectral class | C |
| Abs. magnitude | 7.49 |
| Albedo 4 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html) | 0.050 |
| History 2 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
| Discoverer | J. C. Watson, 1872 |
128 Nemesis is a very large and very dark main belt asteroid, of carbonaceous composition. It rotates rather slowly, taking about one and half Earth days to complete one revolution.
Nemesis is the largest member of the Nemesian asteroid family bearing its name.
It was discovered by J. C. Watson on November 25, 1872 and named after Nemesis, the goddess of retribution in Greek mythology.
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| (For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system) |
| (For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.) |