Bianca (moon)

Bianca
Discovery
Discovered by	Bradford A. Smith / Voyager 2
Discovery date	January 23, 1986
Designations
Designation	Uranus VIII
Pronunciation	/biˈæŋkə/
Adjectives	Biancan
Orbital characteristics
	Epoch 2004 August 25 12:00 ET; (JED 2453243.0)
Semi-major axis	59165.5621±0.0057 km
Eccentricity	0.000274±0.000172
Orbital period (sidereal)	0.43457902±0.00000006 d
Average orbital speed	9.90 km/s
Mean motion	828.387887±0.000121 °/d
Inclination	0.1811°±0.0182° (to Uranus's equator)
Satellite of	Uranus
Physical characteristics
Dimensions	64 × 46 × 46 km
Mean radius	25.4±2.2 km
Volume	70900 km3 ± 29.9%
Mass	(6.38±1.91)×1016 kg
Mean density	0.5–1.2 g/cm3; 0.9 g/cm3 (assumed)
Synodic rotation period	synchronous (assumed)
Axial tilt	zero (assumed)
Albedo	0.065 ± 0.010 (geometric); 0.026 ± 0.005 (Bond)
Apparent magnitude	22.42–22.61 (± 0.24); (at opposition)
Absolute magnitude (H)	9.71–9.90 (± 0.24)

There is also an asteroid called 218 Bianca.

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.^[10] It was named after the sister of Katherina in Shakespeare's play The Taming of the Shrew. It is also designated Uranus VIII.^[11]

Bianca belongs to the Portia group of satellites, which also includes Cressida, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda, and Perdita.^[12] These satellites have similar orbits and photometric properties.^[12] Other than its orbit,^[3] size of 64 km × 46 km (40 mi × 29 mi),^[4] and geometric albedo of 0.065,^[7] little 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 Bianca's prolate spheroid is 0.7±0.2.^[4] Its surface is grey in color.^[13]

Notes

↑ The satellite's shape was modelled as a prolate spheroid (a × b × b); thus, only constraints for two axes were determined (a × b = 32 × 23 km).^[4]
↑ This is the geometric mean of the three axes ( ${\sqrt[{3}]{a\cdot b\cdot b}}$ ), calculated from ${\sqrt {ab}}$ = 27±2 km and $b/a$ = 0.7±0.2.^[4] However, various sources use 27±2 km or 32 × 23 km as the radius value or cross section size instead.

References

↑ Benjamin Smith (1903). The Century Dictionary and Cyclopedia.
↑ Ruud (2008). Critical companion to Dante: a literary reference to his life and work.
1 2 Showalter & Lissauer 2006, Supporting Online Material, Table S3.
1 2 3 4 Karkoschka, Voyager 2001, Table V.
1 2 3 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. Bibcode:2024Icar..41115957F. doi:10.1016/j.icarus.2024.115957. ISSN 0019-1035.
↑ French, Robert S.; Showalter, Mark R. (August 2012). "Cupid is Doomed: An Analysis of the Stability of the Inner Uranian Satellites". Icarus. 220 (2): 911–921. arXiv:1408.2543. Bibcode:2012Icar..220..911F. doi:10.1016/j.icarus.2012.06.031.
1 2 Showalter & Lissauer 2006, Supporting Online Material, Table S2.
↑ Karkoschka, Hubble 2001, Table VII.
1 2 Karkoschka, Hubble 2001, Table IV.
↑ Smith, B. A. (1986-01-27). "Satellites and Rings of Uranus". IAU Circular (4168). Retrieved 2011-10-31.
↑ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.
1 2 Karkoschka, Hubble 2001.
↑ Karkoschka, Voyager 2001.

Bibliography

Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope" (PDF). Icarus. 151 (1): 51–68. Bibcode:2001Icar..151...51K. doi:10.1006/icar.2001.6596.
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.
Showalter, Mark R.; Lissauer, Jack J. (2006-02-17). "The Second Ring-Moon System of Uranus: Discovery and Dynamics". Science. 311 (5763): 973–977. Bibcode:2006Sci...311..973S. doi:10.1126/science.1122882. eISSN 1095-9203. ISSN 0036-8075. JSTOR 3843556. PMID 16373533. S2CID 13240973.

External links

[5] The satellite's shape was modelled as a prolate spheroid (a × b × b); thus, only constraints for two axes were determined (a × b = 32 × 23 km).^[4]

[6] This is the geometric mean of the three axes ( ${\sqrt[{3}]{a\cdot b\cdot b}}$ ), calculated from ${\sqrt {ab}}$ = 27±2 km and $b/a$ = 0.7±0.2.^[4] However, various sources use 27±2 km or 32 × 23 km as the radius value or cross section size instead.

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

[2] Ruud (2008). Critical companion to Dante: a literary reference to his life and work.

[FOOTNOTEShowalterLissauer2006Supporting_Online_Material,_Table_S3-3] 1 2 Showalter & Lissauer 2006, Supporting Online Material, Table S3.

[FOOTNOTEKarkoschka,_Voyager2001Table_V-4] 1 2 3 4 Karkoschka, Voyager 2001, Table V.

[FrenchEtAl2024-7] 1 2 3 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. Bibcode:2024Icar..41115957F. doi:10.1016/j.icarus.2024.115957. ISSN 0019-1035.

[French_&_Showalter_2012-8] French, Robert S.; Showalter, Mark R. (August 2012). "Cupid is Doomed: An Analysis of the Stability of the Inner Uranian Satellites". Icarus. 220 (2): 911–921. arXiv:1408.2543. Bibcode:2012Icar..220..911F. doi:10.1016/j.icarus.2012.06.031.

[FOOTNOTEShowalterLissauer2006Supporting_Online_Material,_Table_S2-9] 1 2 Showalter & Lissauer 2006, Supporting Online Material, Table S2.

[FOOTNOTEKarkoschka,_Hubble2001Table_VII-10] Karkoschka, Hubble 2001, Table VII.

[FOOTNOTEKarkoschka,_Hubble2001Table_IV-11] 1 2 Karkoschka, Hubble 2001, Table IV.

[IAUC_4168-12] Smith, B. A. (1986-01-27). "Satellites and Rings of Uranus". IAU Circular (4168). Retrieved 2011-10-31.

[Gazetteer-13] "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.

[FOOTNOTEKarkoschka,_Hubble2001-14] 1 2 Karkoschka, Hubble 2001.

[FOOTNOTEKarkoschka,_Voyager2001-15] Karkoschka, Voyager 2001.

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See also

Notes

References

Bibliography

External links