Astronomy:Bianca (moon)

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Short description: Moon of Uranus
There is also an asteroid called 218 Bianca.
Bianca
Discovery
Discovered byBradford A. Smith / Voyager 2
Discovery dateJanuary 23, 1986
Designations
Designation
Uranus VIII
Pronunciation/biˈæŋkə/[1]
AdjectivesBiancan[2]
Orbital characteristics
Mean orbit radius59,165.550 ± 0.045 km[3]
Eccentricity0.00092 ± 0.000118[3]
Orbital period0.434578986 ± 0.000000022 d[3]
Inclination0.19308 ± 0.054° (to Uranus' equator)[3]
Satellite ofUranus
Physical characteristics
Dimensions64 × 46 × 46 km[4]
Mean radius25.7 ± 2 km[4][5][6]
Surface area~8300 km2[lower-alpha 1]
Volume~71,000 km3[lower-alpha 1]
Mass~9.2×1016 kg[lower-alpha 1]
Mean density~1.3 g/cm3 (assumed)[5]
~0.0086 m/s2[lower-alpha 1]
~0.022 km/s[lower-alpha 1]
Rotation periodsynchronous[4]
Axial tiltzero[4]
Albedo
Physics~64 K[lower-alpha 1]


Bianca is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on January 23, 1986, and was given the temporary designation S/1986 U 9.[8] It was named after the sister of Katherine in Shakespeare's play The Taming of the Shrew. It is also designated Uranus VIII.[9]

Bianca belongs to the Portia group of satellites, which also includes Cressida, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda and Perdita.[7] These satellites have similar orbits and photometric properties.[7] Other than its orbit,[3] radius of 27 km,[4] and geometric albedo of 0.08[7] virtually nothing is known about it.

In Voyager 2 images Bianca appears as an elongated object, the major axis pointing towards Uranus. The ratio of axes of the Bianca's prolate spheroid is 0.7 ± 0.2.[4] Its surface is grey in color.[4]

See also

References

Explanatory notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Calculated on the basis of other parameters.

Citations

  1. ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
  2. ↑ Ruud (2008) Critical companion to Dante: a literary reference to his life and work
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Jacobson, R. A. (1998). "The Orbits of the Inner Uranian Satellites From Hubble Space Telescope and Voyager 2 Observations". The Astronomical Journal 115 (3): 1195–1199. doi:10.1086/300263. Bibcode: 1998AJ....115.1195J. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 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. 
  5. ↑ 5.0 5.1 5.2 "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. http://ssd.jpl.nasa.gov/?sat_phys_par. 
  6. ↑ 6.0 6.1 Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html. 
  7. ↑ 7.0 7.1 7.2 7.3 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. 
  8. ↑ Smith, B. A. (1986-01-27). "Satellites and Rings of Uranus". IAU Circular 4168. http://www.cbat.eps.harvard.edu/iauc/04100/04168.html#Item1. Retrieved 2011-10-31. 
  9. ↑ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. http://planetarynames.wr.usgs.gov/Page/Planets. 



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