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128 Nemesis

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Discovered by
  
James Craig Watson

Pronunciation
  
/ˈnɛmᵻsɪs/

Observation arc
  
143.39 yr (52373 d)

Orbits
  
Sun

Discoverer
  
James Craig Watson

Named after
  
Nemesis

Discovery date
  
25 November 1872

Minor planet category
  
Main belt,

Discovered
  
25 November 1872

Spectral type
  
C-type asteroid

Asteroid family
  
Nemesis family

128 Nemesis httpsiagoutfileswordpresscom201511c21jpg

Aphelion
  
3.09824 AU (463.490 Gm)

Similar
  
James Craig Watson discoveries, Other celestial objects

128 nemesis is here


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. Nemesis was also the name of a hypothetical companion star of the Sun, which does not exist.

It is categorized as a C-type asteroid, 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. The 39‑hour rotation period is the second longest for an asteroid more than 150 km in diameter.

References

128 Nemesis Wikipedia


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