Perdita (moon)

Short description: Moon of Uranus

Perdita

Discovery
Discovered by| Erich Karkoschka / Voyager 2
Discovery date| May 18, 1999 (in images dating back to January 18, 1986)
Designations

Designation

| Uranus XXV
Pronunciation| /ˈpɜːrdətə/[1]
Adjectives| Perditean /pɜːrdəˈtiːən/[2]
Orbital characteristics
Mean orbit radius| 76,417 ± 1 km[3]
Eccentricity| 0.0012 ± 0.0005[3]
Orbital period| 0.638021 ± 0.000013 d[3]
Inclination| 0.0 ± 0.3° (to Uranus' equator)[3]
Satellite of| Uranus
Physical characteristics
Dimensions| 30 × 30 × 30 km[3]
Mean radius| 15 ± 3 km[3]
Surface area| ~2,800 km2 [lower-alpha 1]
Volume| ~14,000 km3 [lower-alpha 1]
Mass| ~0.18×1017 kg[lower-alpha 1]
Mean density| ~1.3 g/cm3 (assumed)

surface gravity

| ~0.0047 m/s2 [lower-alpha 1]

escape velocity

| ~0.011 km/s[lower-alpha 1]
Rotation period| synchronous[3]
Axial tilt| zero[3]
Albedo| 0.08 ± 0.01[4]
Physics| ~64 K[lower-alpha 1]

Perdita /ˈpɜːrdətə/ is an inner satellite of Uranus. Perdita's discovery was very complicated, as the first photographs 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.[3][5] But because no further pictures could be taken to confirm its existence, it was officially demoted in 2001.[6] 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.[7][8]

Following its discovery in 1999, it was given the temporary designation of S/1986 U 10.[5] It was named Perdita (Latin for 'lost') after the daughter of Leontes and Hermione in William Shakespeare's play The Winter's Tale. The moon is also designated Uranus XXV.[9]

Discovery image of Perdita taken by Voyager 2 on 23 January 1986. The location of the moon is indicated by the arrow on the upper right.

The moon orbits between Belinda and Puck. The above-mentioned Hubble measurements prove that Perdita does not follow a direct Keplerian motion around Uranus. Instead, it is clearly caught in a 43:44 orbital resonance with the nearby moon Belinda. It is also close to an 8:7 resonance with Rosalind.[3][7]

Perdita belongs to the Portia group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Juliet, Cupid, Rosalind and Belinda.[4] These satellites have similar orbits and photometric properties.[4] Little is known about Perdita apart from its orbit,[3][7] radius of 15 km[3] and geometric albedo of 0.08.[4]

## See also

* Moons of Uranus

## References

Explanatory notes

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Calculated on the basis of other parameters.

Citations

1. ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
2. ↑ Byrne (2008) Perdita: the literary, theatrical, scandalous life of Mary Robinson
3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 Karkoschka, Voyager 2001.
4. ↑ 4.0 4.1 4.2 4.3 Karkoschka, Hubble 2001.
5. ↑ 5.0 5.1 IAUC 7171.
6. ↑ Foust 2001.
7. ↑ 7.0 7.1 7.2 Showalter & Lissauer 2006.
8. ↑ IAUC 8194.
9. ↑ USGS: Planet and Satellite Names and Discoverers.

Sources

* Karkoschka, Erich (2001). "Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites". Icarus 151 (1): 69–77. doi:10.1006/icar.2001.6597. Bibcode: 2001Icar..151...69K.
* Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus 151 (1): 51–68. doi:10.1006/icar.2001.6596. Bibcode: 2001Icar..151...51K.
* Green, Daniel W. E. (May 18, 1999). "S/1986 U 10". IAU Circular 7171: 1. ISSN 0081-0304. Bibcode: 1999IAUC.7171....1K. http://www.cbat.eps.harvard.edu/iauc/07100/07171.html. Retrieved 2012-01-26.
* Foust, Jeff (December 31, 2001). "Moon of Uranus is demoted". Spaceflight Now. http://spaceflightnow.com/news/n0112/31uranusmoon/.
* Showalter, Mark R.; Lissauer, Jack J. (2006-02-17). "The Second Ring-Moon System of Uranus: Discovery and Dynamics". Science 311 (5763): 973–977. doi:10.1126/science.1122882. PMID 16373533. Bibcode: 2006Sci...311..973S.
* Green, Daniel W. E. (September 3, 2003). "Satellites of Uranus". IAU Circular 8194. ISSN 0081-0304. http://www.cbat.eps.harvard.edu/iauc/08100/08194.html. Retrieved 2012-01-26.
* USGS/IAU (July 21, 2006). "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. http://planetarynames.wr.usgs.gov/Page/Planets#UranianSystem.

## External links

* Uranus 'Loses' a Moon: The 'New' Official Moon Count of the Solar System (Archived), Melanie Melton, The Planetary Society, 20 December 2001

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