128 Nemesis

Tags: Planet.

128 Nemesis is a large 188 km main-belt asteroid of carbonaceous composition. It rotates rather slowly taking about one and half Earth days (39 hours) 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.

apoapsis (km)

4.63605e+11

average speed (km/s)

64404.0

orbital period (μ)

1.43871e+08

periapsis (km)

3.5901e+11

temperature (K)

168.0

absolute magnitude

7.49

albedo

0.05

apparent magnitude

10.46

discovery date

1872-11-25

discoverer

James Craig Watson

epoch

December 31 2006 (JD 2454100.5)

escape velocity (kmh)

358.2

rotation period (s)

140400.0