Prospero (moon)

Prospero
	Discovery image of Prospero, taken by the CFHT in July 1999
Discovery
Discovered by	John J. Kavelaars; Brett J. Gladman; Matthew J. Holman; Jean-Marc Petit; Hans Scholl;
Discovery date	18 July 1999
Designations
Designation	Uranus XVIII
Pronunciation	/ˈprɒspɛroʊ/
Adjectives	Prosperonian /prɒspɛˈroʊniən/, Prosperian /prɒˈspɪəriən/
Orbital characteristics
Mean orbit radius	16,256,000 km
Eccentricity	0.4448
Orbital period (sidereal)	1978.29 d
Inclination	152° (to the ecliptic)
Satellite of	Uranus
Physical characteristics
Mean radius	25 km (estimate); <50 km
Surface area	~8000 km2 (estimate)
Volume	~65,000 km3 (estimate)
Mass	~8.5×1016 kg (estimate)
Mean density	~1.3 g/cm3 (assumed)
Surface gravity	~0.0063 m/s2 (estimate)
Escape velocity	~0.021 km/s (estimate)
Synodic rotation period	7.145±0.092 h
Axial tilt	?
Albedo	0.04 (assumed)
Temperature	~65 K (estimate)

Prospero is a relatively small retrograde irregular satellite of Uranus discovered on 18 July 1999 by the astrophysicist Matthew Holman and his team, and given the provisional designation S/1999 U 3. Confirmed as Uranus XVIII it was named after the sorcerer Prospero in William Shakespeare's play The Tempest.

The orbital parameters suggest that it may belong to the same dynamic cluster as Sycorax and Setebos, suggesting common origin.^[8] However, this suggestion does not appear to be supported by the observed colours. The satellite appears neutral (grey) in visible light (colour indices B−V=0.80, R−V=0.39),^[9] similar to Setebos but different from Sycorax (which is light red).

References[edit]

^ Benjamin Smith (1903), The Century Dictionary and Cyclopedia
^ Emenyonu, Ernest (2003), Emerging perspectives on Chinua Achebe, v. 1.
^ in scare quotes in Bate (1997) The genius of Shakespeare
^ ^a ^b ^c Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.
^ ^a ^b Yeomans, Donald K. (28 June 2007). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 19 January 2008.
^ ^a ^b Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... rⁱ (km) ... 25 ... ⁱ Radius of satellite assuming a geometric albedo of 0.04.
^ ^a ^b Farkas-Takács, A.; Kiss, Cs.; Pál, A.; Molnár, L.; Szabó, Gy. M.; Hanyecz, O.; et al. (September 2017). "Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations". The Astronomical Journal. 154 (3): 13. arXiv:1706.06837. Bibcode:2017AJ....154..119F. doi:10.3847/1538-3881/aa8365. S2CID 118869078. 119.
^ Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; Aksnes, Kaare Photometric survey of the irregular satellites, Icarus, 166, (2003), pp. 33–45. arXiv:astro-ph/0301016
^ Grav, Holman & Fraser 2004.

Grav, Tommy; Holman, Matthew J.; Fraser, Wesley C. (20 September 2004). "Photometry of Irregular Satellites of Uranus and Neptune". The Astrophysical Journal. 613 (1): L77–L80. arXiv:astro-ph/0405605. Bibcode:2004ApJ...613L..77G. doi:10.1086/424997. S2CID 15706906.
Sheppard, S. S.; Jewitt, D.; Kleyna, J. (2005). "An Ultradeep Survey for Irregular Satellites of Uranus: Limits to Completeness". The Astronomical Journal. 129 (1): 518–525. arXiv:astro-ph/0410059. Bibcode:2005AJ....129..518S. doi:10.1086/426329. S2CID 18688556.

External links[edit]

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

[2] Emenyonu, Ernest (2003), Emerging perspectives on Chinua Achebe, v. 1.

[3] scare quotes in Bate (1997) The genius of Shakespeare

[FOOTNOTESheppardJewittKleyna2005523Table_3-4] Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.

[JPL-5] Yeomans, Donald K. (28 June 2007). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 19 January 2008.

[Sheppard_et_al._2005_radius/albedo-6] Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... rⁱ (km) ... 25 ... ⁱ Radius of satellite assuming a geometric albedo of 0.04.

[FarkasTakacs2017-7] Farkas-Takács, A.; Kiss, Cs.; Pál, A.; Molnár, L.; Szabó, Gy. M.; Hanyecz, O.; et al. (September 2017). "Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations". The Astronomical Journal. 154 (3): 13. arXiv:1706.06837. Bibcode:2017AJ....154..119F. doi:10.3847/1538-3881/aa8365. S2CID 118869078. 119.

[Grav_2003-8] Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; Aksnes, Kaare Photometric survey of the irregular satellites, Icarus, 166, (2003), pp. 33–45. arXiv:astro-ph/0301016

[FOOTNOTEGravHolmanFraser2004-9] Grav, Holman & Fraser 2004.

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