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128 Nemesis

Main-belt asteroid From Wikipedia, the free encyclopedia

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.[3][9] Nemesis is the largest member of the Nemesian asteroid family bearing its name. It was discovered by J. C. Watson on 25 November 1872,[3] and named after Nemesis, the goddess of retribution in Greek mythology.

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Diagram of Nemesis's orbit

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This object is orbiting the Sun with a period of 4.56 years 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,[10] 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,[11] while WISE measurements yield a size of ~163 km.[7] The 77.81‑hour[12] rotation period is the second longest for an asteroid more than 150 km in diameter.[13]

Between 2005 and 2021, 128 Nemesis has been observed to occult eight stars.

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Notes

  1. Flattening derived from the maximum aspect ratio (c/a): , where (c/a) = 0.83±0.04.[6]

References

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