Perdita (moon)

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/
Adjectives	Perditean /pɜːrdəˈtiːən/
Orbital characteristics
Mean orbit radius	76,417 ± 1 km
Eccentricity	0.0012 ± 0.0005
Orbital period	0.638021 ± 0.000013 d
Inclination	0.0 ± 0.3° (to Uranus' equator)
Satellite of	Uranus
Physical characteristics
Dimensions	30 × 30 × 30 km
Mean radius	15 ± 3 km
Surface area	~2,800 km2
Volume	~14,000 km3
Mass	~0.18×1017 kg
Mean density	~1.3 g/cm3 (assumed)
surface gravity	~0.0047 m/s2
escape velocity	~0.011 km/s
Rotation period	synchronous
Axial tilt	zero
Albedo	0.08 ± 0.01
Physics	~64 K

Short description: Moon of Uranus

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]

References

Explanatory notes

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

Citations

↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
↑ Byrne (2008) Perdita: the literary, theatrical, scandalous life of Mary Robinson
↑ ^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.
↑ ^4.0 ^4.1 ^4.2 ^4.3 Karkoschka, Hubble 2001.
↑ ^5.0 ^5.1 IAUC 7171.
↑ Foust 2001.
↑ ^7.0 ^7.1 ^7.2 Showalter & Lissauer 2006.
↑ IAUC 8194.
↑ 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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Original source: https://en.wikipedia.org/wiki/Perdita (moon). Read more

[calculated-4] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 Calculated on the basis of other parameters.

[1] Benjamin Smith (1903) The Century Dictionary and Cyclopedia

[2] Byrne (2008) Perdita: the literary, theatrical, scandalous life of Mary Robinson

[FOOTNOTEKarkoschka,_Voyager2001-3] 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.

[FOOTNOTEKarkoschka,_Hubble2001-5] 4.0 ^4.1 ^4.2 ^4.3 Karkoschka, Hubble 2001.

[FOOTNOTEIAUC_7171-6] 5.0 ^5.1 IAUC 7171.

[FOOTNOTEFoust2001-7] Foust 2001.

[FOOTNOTEShowalterLissauer2006-8] 7.0 ^7.1 ^7.2 Showalter & Lissauer 2006.

[FOOTNOTEIAUC_8194-9] IAUC 8194.

[FOOTNOTEUSGS:_Planet_and_Satellite_Names_and_Discoverers-10] USGS: Planet and Satellite Names and Discoverers.

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[3]

[lower-alpha 1]

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v t e Moons of Uranus
Generally listed in increasing distance from Uranus
Inner	Rings of Uranus Cordelia Ophelia Bianca Cressida Desdemona Juliet Portia Rosalind Cupid Belinda Perdita Puck Mab
Major (spheroid)	Miranda Ariel Umbriel Titania Oberon
Outer (irregular)	Francisco Caliban Stephano Trinculo Sycorax Margaret Prospero Setebos Ferdinand
Geological features	Arielian Kachina Chasmata Yangoor Mirandian Verona Rupes Oberonian Hamlet Mommur Chasma Puckian Titanian Gertrude Messina Chasmata Ursula Rousillon Rupes Umbrielian Wunda Vuver Skynd

v t e Natural satellites of the Solar System
Planetary satellites	Terrestrial Martian Jovian Saturnian Uranian Neptunian
Dwarf-planet satellites	Plutonian Haumean Makemakean Eridian OR₁₀ Quaoaran Orcean
Minor-planet moons	Main belt binaries: Antiope Frostia Berna Tokai Ostro Balam Doppler Pauling Iwamoto Wolff Bettig Christophedumas Trojans: Patroclus–Menoetius Hektor–Skamandrios Iphthime Eurydamas TNOs: Huya Typhon–Echidna Lempo–Paha–Hiisi 2002 UX₂₅ Logos–Zoe Ceto–Phorcys Borasisi–Pabu Sila–Nunam Teharonhiawako–Sawiskera Salacia–Actaea 2002 WC₁₉ Altjira Varda–Ilmarë 2003 AZ₈₄ Gǃkúnǁʼhòmdímà–Gǃòʼé ǃHú Mors–Somnus Manwë–Thorondor ǂKá̦gára–ǃHãunu 2013 FY27
Ranked by size	Planetary-mass moon Ganymede largest: 5268 km / 0.413 Earths Titan Callisto Io Moon Europa Triton Titania Rhea Oberon Iapetus Charon Umbriel Ariel Dione Tethys Dysnomia Enceladus Miranda Vanth Proteus Mimas Ilmarë Nereid Hiʻiaka Actaea Hyperion ...
Discovery timeline Inner moons Irregular moons List Planetary-mass moons Naming Subsatellite Regular moons Trojan moons

Perdita (moon)

Topic: Astronomy

See also

References

External links

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]}