Bianca (moon)

Moon of Uranus

See also: Bianca (disambiguation)

There is also an asteroid called 218 Bianca.
Bianca

Discovery
Discovered by| Bradford A. Smith / Voyager 2
Discovery date| January 23, 1986
Designations

Designation

| Uranus VIII
Pronunciation| /biˈæŋkə/[1]
Adjectives| Biancan[2]
Orbital characteristics[3]

Semi-major axis

| 59165.550±0.045 km
Eccentricity| 0.00092 ± 0.000118

Orbital period (sidereal)

| 0.434578986 ± 0.000000022 d
Inclination| 0.19308 ± 0.054° (to Uranus' equator)
Satellite of| Uranus
Physical characteristics
Dimensions| 64 × 46 × 46 km[4][note 1]

Surface area

| ~8400 km2[a]
Volume| 70900±29.9% km3[5]
Mass| (6.38±1.91)×1016 kg[5]

Mean density

| ≥0.79 g/cm3[5]
0.90 g/cm3 (assumed)[5]

Surface gravity

| ~0.004–0.008 m/s2[a]

Escape velocity

| ~0.016–0.019 km/s[a]

Synodic rotation period

| synchronous[4]

Axial tilt

| zero[4]
Albedo| 0.08 ± 0.01[6]
0.07[7][8]
Temperature| ~64 K[a]

1. ^ Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.

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.[9] It was named after the sister of Katherine in Shakespeare's play The Taming of the Shrew. It is also designated Uranus VIII.[10]

Bianca belongs to the Portia group of satellites, which also includes Cressida, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda, and Perdita.[6] These satellites have similar orbits and photometric properties.[6] Other than its orbit,[3] size of 64 × 46 km,[4] and geometric albedo of 0.08,[6] virtually nothing is known about it.

In Voyager 2 images Bianca appears as an elongated object, with its 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

[edit]

* Moons of Uranus

## Notes

[edit]

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

## References

[edit]

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. ^ a b 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\. Bibcode:1998AJ....115.1195J. doi:10.1086/300263. S2CID 118616209.1195-1199&rft.date=1998&rft_id=https://api.semanticscholar.org/CorpusID:118616209#id-name=S2CID&rft_id=info:doi/10.1086/300263&rft_id=info:bibcode/1998AJ....115.1195J&rft.aulast=Jacobson&rft.aufirst=R.+A.&rft_id=https://doi.org/10.1086%2F300263&rfr_id=info:sid/en.wikipedia.org:Bianca+(moon)" class="Z3988">
4. ^ a b c d e f 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.2001.6597.69-77&rft.date=2001&rft_id=info:doi/10.1006/icar.2001.6597&rft_id=info:bibcode/2001Icar..151...69K&rft.aulast=Karkoschka&rft.aufirst=Erich&rfr_id=info:sid/en.wikipedia.org:Bianca+(moon)" class="Z3988">
5. ^ a b c d French, Richard G.; Hedman, Matthew M.; Nicholson, Philip D.; Longaretti, Pierre-Yves; McGhee-French, Colleen A. (2024-03-15). "The Uranus system from occultation observations (1977–2006): Rings, pole direction, gravity field, and masses of Cressida, Cordelia, and Ophelia". Icarus. 411: 115957. arXiv:2401.04634. doi:10.1016/j.icarus.2024.115957. ISSN 0019-1035.
6. ^ a b c d 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.2001.6596.51-68&rft.date=2001&rft_id=info:doi/10.1006/icar.2001.6596&rft_id=info:bibcode/2001Icar..151...51K&rft.aulast=Karkoschka&rft.aufirst=Erich&rfr_id=info:sid/en.wikipedia.org:Bianca+(moon)" class="Z3988">
7. ^ "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. Archived from the original on 17 January 2009. Retrieved 12 December 2008.
8. ^ Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.
9. ^ Smith, B. A. (1986-01-27). "Satellites and Rings of Uranus". IAU Circular. 4168. Retrieved 2011-10-31.
10. ^ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.

## External links

[edit]

* Bianca Profile by NASA's Solar System Exploration
* Uranus' Known Satellites (by Scott S. Sheppard)

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