The Short Rotation Period of Nereid

  title={The Short Rotation Period of Nereid},
  author={T. Grav and Matthew J. Holman and J. Nossen University of Oslo and Harvard--Smithsonian Center for Astrophysics and National Research Council Canada},
  journal={The Astrophysical Journal},
We determine the period, p = 11.52 ± 0.14 hr, and a light-curve peak-to-peak amplitude, a = 0.029 ± 0.003 mag, of the Neptunian irregular satellite Nereid. If the light-curve variation is due to albedo variations across the surface, rather than solely to the shape of Nereid variations, the rotation period would be a factor of 2 shorter. In either case, such a rotation period and light-curve amplitude, together with Nereid's orbital period, p = 360.14 days, imply that Nereid is almost certainly… 

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