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| 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][3] |
| Orbital characteristics | |
Mean orbit radius | 76,417 ± 1 km[4] |
| Eccentricity | 0.0012 ± 0.0005[4] |
| 0.638021 ± 0.000013 d[4] | |
| Inclination | 0.0 ± 0.3° (to Uranus' equator)[4] |
| Satellite of | Uranus |
| Physical characteristics | |
| 13.3±0.7 km[5] | |
| ~2220 km2[a] | |
| Volume | ~9850 km3[a] |
| Mass | ~(4.93–8.87)×1015 kg[a] |
Mean density | 0.5–0.9 g/cm3[6][7] |
| ~0.002–0.003 m/s2[a] | |
| ~0.007–0.009 km/s[a] | |
| synchronous[4] | |
| zero[4] | |
| Albedo | 0.08 ± 0.01 (assumed)[8] |
| Temperature | ~64 K[a] |
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.[4][9] But because no further pictures could be taken to confirm its existence, it was officially demoted in 2001.[10] 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.[8][11]
Following its discovery in 1999, it was given the temporary designation of S/1986 U 10.[9] 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.[12]
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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, and from this resonance it has been determined that Belinda's mass is 26 times that of Perdita.[13] It is also close to an 8:7 resonance with Rosalind.[4][8]
Perdita belongs to the Portia group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Juliet, Cupid, Rosalind, and Belinda.[14] These satellites have similar orbits and photometric properties.[14] Little is known about Perdita apart from its orbit,[4][8] radius of 13.3 km,[5] and geometric albedo of 0.08.[14][8]
- ^ Benjamin Smith (1903). The Century Dictionary and Cyclopedia.
- ^ Byrne (2008). Perdita: the literary, theatrical, scandalous life of Mary Robinson.
- ^ J. B. Lethbridge (2013) Shakespeare and Spenser: Attractive opposites.
- ^ a b c d e f g h i Karkoschka, Voyager 2001.
- ^ a b Showalter & Lissauer (2006),[8] as cited in Ćuk et al. (2022).[7]
- ^ French & Showalter 2012.
- ^ a b Ćuk et al. 2022.
- ^ a b c d e f Showalter & Lissauer 2006.
- ^ a b IAUC 7171.
- ^ Foust 2001.
- ^ IAUC 8194.
- ^ USGS: Planet and Satellite Names and Discoverers.
- ^ French, Robert S.; Showalter, Mark R.; de Pater, Imke; Lissauer, Jack J. (2017-10-01). Orbital and Photometric Analysis of the Inner Uranian Satellites from Hubble Images. Vol. 49. p. 214.19.
- ^ a b c Karkoschka, Hubble 2001.
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