Perdita (moon)
| Discovery | |
|---|---|
| Discovered by | Erich Karkoschka / Voyager 2 |
| Discovery date | May 18, 1999 (in images dating back to January 18, 1986) |
| Orbital characteristics | |
| Mean orbit radius | 76,417 ± 1 km[1] |
| Eccentricity | 0.0012 ± 0.0005[1] |
| Orbital period | 0.638021 ± 0.000013 d[1] |
| Inclination | 0.0 ± 0.3° (to Uranus' equator)[1] |
| Satellite of | Uranus |
| Physical characteristics | |
| Dimensions | 30 × 30 × 30 km[1] |
| Mean radius | 15 ± 3 km[1] |
| Surface area | ~2,800 km²[2] |
| Volume | ~14,000 km³[2] |
| Mass | ~0.18×1017 kg[2] |
| Mean density | ~1.3 g/cm³ assumed |
| Equatorial surface gravity | ~0.0047 m/s2[2] |
| Escape velocity | ~0.011 km/s[2] |
| Rotation period | synchronous[1] |
| Axial tilt | zero[1] |
Perdita is a closer moon to Uranus. Perdita's discovery was not simple. The first pictures of Perdita were taken by the Voyager 2 spacecraft in 1986, but it was not recognized from the photographs for more than a decade. In 1999, the moon was noticed by Erich Karkoschka and reported.[1][4] But because no further pictures could be taken to confirm its existence, it was thought to be non-existent in 2001.[5] However, in 2003, pictures taken by the Hubble Space Telescope managed to pick up an object where Perdita was supposed to be, finally confirming its existence.[6][7]
Following its discovery in 1999, Perdita was given the designation of S/1986 U 10.[4] It was named after the daughter of Leontes and Hermione in William Shakespeare's play The Winter's Tale. The moon is also designated Uranus XXV.[8]
Perdita belongs to Portia Group of moons, which also includes Bianca, Cressida, Desdemona, Portia, Juliet, Cupid, Rosalind and Belinda.[3] These moons have similar orbits and photometric properties.[3] Unfortunately, other than its orbit,[1][6] radius of 15 km[1] and geometric albedo of 0.08[3] almost nothing is known about it.
References[change]
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Karkoschka, Erich (2001). "Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites". Icarus 151: 69–77. doi:10.1006/icar.2001.6597. http://adsabs.harvard.edu/abs/2001Icar..151...69K.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Calculated on the basis of other parameters
- ↑ 3.0 3.1 3.2 3.3 Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus 151: 51–68. doi:10.1006/icar.2001.6596. http://adsabs.harvard.edu/abs/2001Icar..151...51K.
- ↑ 4.0 4.1 Karkoschka, Erich (May 18 1999). "IAU Circular No. 7171". http://cfa-www.harvard.edu/iauc/07100/07171.html. Retrieved 2006-08-05.
- ↑ Foust, Jeff (December 31 2001). "Moon of Uranus is demoted". Spaceflight Now. http://spaceflightnow.com/news/n0112/31uranusmoon/. Retrieved 2006-08-05.
- ↑ 6.0 6.1 Showalter, Mark R.; Lissauer, Jack J. (2005-12-22). "The Second Ring-Moon System of Uranus: Discovery and Dynamics". Science Express. doi:10.1126/science.1122882. http://www.sciencemag.org/cgi/content/abstract/1122882v1.
- ↑ Showalter, M. R.; Lissauer, J. J. (September 3 2003). "IAU Circular No. 8194". http://cfa-www.harvard.edu/iauc/08100/08194.html. Retrieved 2006-08-05.
- ↑ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21 2006. http://planetarynames.wr.usgs.gov/append7.html. Retrieved 2006-08-05.
Other websites[change]
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