Cressida (moon)

Cressida
	Voyager 2 image of the Uranian moons Portia, Cressida, and Ophelia
Discovery
Discovered by	Stephen P. Synnott / Voyager 2
Discovery date	January 9, 1986
Orbital characteristics
Mean orbit radius	61,766.730 ± 0.046 km
Eccentricity	0.00036 ± 0.00011
Orbital period (sidereal)	0.463569601 ± 0.000000013 d
Inclination	0.006 ± 0.040° (to Uranus' equator)
Satellite of	Uranus
Physical characteristics
Dimensions	92 × 74 × 74 km
Mean radius	39.8 ± 2 km
Surface area	~20,000 km²
Volume	~260,000 km³
Mass	~3.4×1017 kg
Mean density	~1.3 g/cm³ (assumed)
Surface gravity	~0.013 m/s2
Escape velocity	~0.034 km/s
Synodic rotation period	synchronous
Axial tilt	zero
Albedo	0.08 ± 0.01; 0.07;
Temperature	~64 K

There is also an asteroid called 548 Kressida.

Cressida (/ˈkrɛs[invalid input: 'ɨ']də/ KRES-i-də, Greek: Χρησίδα) is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 9 January 1986, and was given the temporary designation S/1986 U 3.^[6] It was named after the Trojan daughter of Calchas, a tragic heroine who appears in William Shakespeare's play Troilus and Cressida (as well as in tales by Geoffrey Chaucer and others). It is also designated Uranus IX.^[7]

Cressida belongs to the Portia Group of satellites, which includes Bianca, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda and Perdita.^[5] These satellites have similar orbits and photometric properties.^[5] Unfortunately, other than its orbit,^[1] radius of 41 km^[2] and geometric albedo of 0.08^[5] virtually nothing is known about it.

At the Voyager 2 images Cressida appears as an elongated object, the major axis pointing towards Uranus. The ratio of axes of the Cressida's prolate spheroid is 0.8 ± 0.3.^[2] Its surface is grey in color.^[2]

Cressida may collide with Desdemona within the next 100 million years.^[8]

References

Explanatory notes

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

Citations

^ ^a ^b ^c ^d ^e Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1086/300263 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1086/300263 instead.
^ ^a ^b ^c ^d ^e ^f ^g Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1006/icar.2001.6597 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1006/icar.2001.6597 instead.
^ ^a ^b ^c "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. Retrieved 12 December 2008.
^ ^a ^b Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.
^ ^a ^b ^c ^d Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1006/icar.2001.6596 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1006/icar.2001.6596 instead.
^ Smith, B. A. (January 16, 1986). "Satellites of Uranus". IAU Circular. 4164. Retrieved 29 October 2011.
^ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.
^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1006/icar.1996.5568 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1006/icar.1996.5568 instead.

External links

[calculated-5] ^ ^a ^b ^c ^d ^e ^f Calculated on the basis of other parameters.

[Jacobson_1998-1] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1086/300263 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1086/300263 instead.

[Karkoschka,_Voyager_2001-2] ^ ^a ^b ^c ^d ^e ^f ^g Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1006/icar.2001.6597 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1006/icar.2001.6597 instead.

[JPL-SSD-sat_phys-3] "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. Retrieved 12 December 2008.

[Williams_2007_nssdc-4] Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.

[Karkoschka,_Hubble_2001-6] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1006/icar.2001.6596 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1006/icar.2001.6596 instead.

[IAUC_4164-7] Smith, B. A. (January 16, 1986). "Satellites of Uranus". IAU Circular. 4164. Retrieved 29 October 2011.

[Gazetteer-8] "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.

[Duncan_Lissauer_1997-9] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1006/icar.1996.5568 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1006/icar.1996.5568 instead.

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See also

References

External links