Nereid (muin)

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Nereid
Image o Nereid by Voyager 2
Image o Nereid bi Voyager 2
Discovery
Discovered bi Gerard P. Kuiper[1]
Discovery date Mey 1, 1949
Designations
Pronunciation /ˈnɪəri.ɪd/ or /ˈnɛri.ɪd/
Adjective Nereidian, Nereidean
Orbital characteristics
Epoch J2000
Periapsis 1,372,000 km (0.00917 AU)
Apoapsis 9,655,000 km (0.06454 AU)
Semi-major axis 5,513,787 km (0.03685 AU)
Eccentricity 0.7507 [2][3]
Orbital period 360.1362 d
Average orbital speed 934 m/s
Inclination
Satellite o Neptune
Pheesical characteristics
Mean radius 170 ± 25 km[4]
Mass 3.1×1019 kg (assumed)[4]
Mean density 1.5 g/cm³ (assumed)[4]
Equatorial surface gravity ~0.072 m/s²
Escape velocity ~0.156 km/s
Rotation period 0.48 d (11 h 31 min)[5]
Albedo 0.155[4]
Temperatur ~50 K mean (estimate)

Nereid is the third-lairgest muin o Neptune. It haes a heichly eccentric orbit. It wis the seicont muin o Neptune tae be discovered, bi Gerard Kuiper in 1949.

References[eedit | eedit soorce]

  1. Kuiper, G. P. (August 1949). "The Second Satellite of Neptune". Publications of the Astronomical Society of the Pacific. 61: 175–176. Bibcode:1949PASP...61..175K. doi:10.1086/126166. 
  2. 2.0 2.1 Jacobson, R. A. — AJ (2009-04-03). "Planetary Satellite Mean Orbital Parameters". JPL satellite ephemeris. JPL (Solar System Dynamics). Retrieved 2011-10-26.  Archived 5 October 2011 at WebCite.
  3. 3.0 3.1 Jacobson, R. A. (3 Aprile 2009). "The Orbits of the Neptunian Satellites and the Orientation of the Pole of Neptune". The Astronomical Journal. 137 (5): 4322–4329. Bibcode:2009AJ....137.4322J. doi:10.1088/0004-6256/137/5/4322. 
  4. 4.0 4.1 4.2 4.3 "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). Archived frae the oreeginal on 2010-01-18. Retrieved 2011-10-26. 
  5. Grav, T.; M. Holman, J. J. Kavelaars (2003). "The Short Rotation Period of Nereid". The Astrophysical Journal. 591 (1): 71–74. arXiv:astro-ph/0306001. Bibcode:2003ApJ...591L..71G. doi:10.1086/377067.  Cite uses deprecated parameter |coauthors= (help)