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Perdita (moon)

Summary

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][8] But because no further pictures could be taken to confirm its existence, it was officially demoted in 2001.[9] 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][10]

Perdita
Discovery
Discovered byErich Karkoschka / Voyager 2
Discovery dateMay 18, 1999 (in images dating back to January 18, 1986)
Designations
Designation
Uranus XXV
Pronunciation/ˈpɜːrdətə/[1]
AdjectivesPerditean /pɜːrdəˈtiːən/[2]
Orbital characteristics
Mean orbit radius
76,417 ± 1 km[3]
Eccentricity0.0012 ± 0.0005[3]
0.638021 ± 0.000013 d[3]
Inclination0.0 ± 0.3° (to Uranus' equator)[3]
Satellite ofUranus
Physical characteristics
Mean radius
13.3±0.7 km[4]
~2220 km2[a]
Volume~9850 km3[a]
Mass~(4.93–8.87)×1015 kg[a]
Mean density
0.5–0.9 g/cm3[5][6]
~0.002–0.003 m/s2[a]
~0.007–0.009 km/s[a]
synchronous[3]
zero[3]
Albedo0.08 ± 0.01 (assumed)[7]
Temperature~64 K[a]

Following its discovery in 1999, it was given the temporary designation of S/1986 U 10.[8] 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.[11]

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, and from this resonance it has been determined that Belinda's mass is 26 times that of Perdita.[12] 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.[13] These satellites have similar orbits and photometric properties.[13] Little is known about Perdita apart from its orbit,[3][7] radius of 13.3 km[4] and geometric albedo of 0.08.[13][7]

See also edit

Notes edit

  1. ^ a b c d e f Calculated on the basis of other parameters.

References edit

Citations edit

  1. ^ Benjamin Smith (1903). The Century Dictionary and Cyclopedia.
  2. ^ Byrne (2008). Perdita: the literary, theatrical, scandalous life of Mary Robinson.
  3. ^ a b c d e f g h i Karkoschka, Voyager 2001.
  4. ^ a b Showalter & Lissauer (2006),[7] as cited in Ćuk et al. (2022).[6]
  5. ^ French & Showalter 2012.
  6. ^ a b Ćuk et al. 2022.
  7. ^ a b c d e f Showalter & Lissauer 2006.
  8. ^ a b IAUC 7171.
  9. ^ Foust 2001.
  10. ^ IAUC 8194.
  11. ^ USGS: Planet and Satellite Names and Discoverers.
  12. ^ 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.
  13. ^ a b c Karkoschka, Hubble 2001.

Sources edit

  • 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. Bibcode:2001Icar..151...69K. doi:10.1006/icar.2001.6597.
  • Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus. 151 (1): 51–68. Bibcode:2001Icar..151...51K. doi:10.1006/icar.2001.6596.
  • Green, Daniel W. E. (May 18, 1999). "S/1986 U 10". IAU Circular. 7171: 1. Bibcode:1999IAUC.7171....1K. ISSN 0081-0304. Retrieved 2012-01-26.
  • Foust, Jeff (December 31, 2001). "Moon of Uranus is demoted". Spaceflight Now. Retrieved 2012-01-26.
  • Showalter, Mark R.; Lissauer, Jack J. (2006-02-17). "The Second Ring-Moon System of Uranus: Discovery and Dynamics". Science. 311 (5763): 973–977. Bibcode:2006Sci...311..973S. doi:10.1126/science.1122882. PMID 16373533. S2CID 13240973.
  • Green, Daniel W. E. (September 3, 2003). "Satellites of Uranus". IAU Circular. 8194. ISSN 0081-0304. Retrieved 2012-01-26.
  • USGS/IAU (July 21, 2006). "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. Retrieved 2012-01-26.
  • Ćuk, Matija; French, Robert S.; Showalter, Mark R.; Tiscareno, Matthew S.; Moutamid, Maryame El (2022-07-16). "Cupid is not Doomed Yet: On the Stability of the Inner Moons of Uranus". The Astronomical Journal. 164 (2): 38. arXiv:2205.14272. doi:10.3847/1538-3881/ac745d. ISSN 1538-3881.
  • French, Robert S.; Showalter, Mark R. (August 2012). "Cupid is Doomed: An Analysis of the Stability of the Inner Uranian Satellites". Icarus. 220 (2): 911–921. arXiv:1408.2543. doi:10.1016/j.icarus.2012.06.031.

External links edit

  • 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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