128 Nemesis
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128 Nemesis is a large 180 km main-belt asteroid, of carbonaceous composition. It rotates rather slowly, taking about 78 hours to complete one rotation.[1][2] Nemesis is the largest member of the Nemesian asteroid family bearing its name. It was discovered by J. C. Watson on 25 November 1872,[1] and named after Nemesis, the goddess of retribution in Greek mythology.
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This object is orbiting the Sun with a period of Template:Convert and an eccentricity (ovalness) of 0.13. The orbital plane is inclined by 6.2° to the plane of the ecliptic. It is categorized as a C-type asteroid,[3] indicating a primitive carbonaceous composition. Based on IRAS data Nemesis is about 188 km in diameter and is around the 33rd largest main-belt asteroid,[4] while WISE measurements yield a size of ~163 km.[5] The 77.81‑hour[6] rotation period is the second longest for an asteroid more than 150 km in diameter.[7]
Between 2005 and 2021, 128 Nemesis has been observed to occult eight stars.
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