Nereid (muin)
Frae Wikipedia
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]
- ↑ 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.
- ↑ 2.0 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.
- ↑ 3.0 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.
- ↑ 4.0 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.
- ↑ Grav, T.; M. Holman, J. J. Kavelaars (2003). "The Short Rotation Period of Nereid". The Astrophysical Journal. 591 (1): 71–74. Bibcode:2003ApJ...591L..71G. arXiv:astro-ph/0306001. doi:10.1086/377067. Cite uses deprecated parameter
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