128 Nemesis

**128 Nemesis**
Orbital characteristics ¹
Orbit type	Main belt (Nemesis )
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
Diameter	188.2 km
Rotation period	39 hours
Spectral class	C
Abs. magnitude	7.49
Albedo ⁴	0.050
History ²
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 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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Categories: Nemesis asteroids