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Belinda (moon)

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Belinda
Image of Belinda acquired by Voyager 2
Belinda viewed by Voyager 2 in 1986
Discovery
Discovered byStephen P. Synnott / Voyager 2
Discovery dateJanuary 13, 1986
Designations
Designation
Uranus XIV
Pronunciation/bəˈlɪndə/[1]
AdjectivesBelindian
Orbital characteristics[2]
75 255.613 ± 0.057 km
Eccentricity0.00007 ± 0.000073
0.623527470 ± 0.000000017 d
Inclination0.03063 ± 0.028° (to Uranus' equator)
Satellite ofUranus
Physical characteristics
Dimensions128 × 64 × 64 km[3][note 1]
~22000 km2[a]
Volume~270000 km3[b]
Mass~(1.4–2.3)×1017 kg[a][c]
Mean density
0.5–0.84 g/cm3[8][d]
~0.002–0.015 m/s2[e]
~0.017–0.031 km/s[f]
synchronous[3]
zero[3]
Albedo0.08 ± 0.01[9]
Temperature~64 K[a]
  1. ^ Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.

Belinda is an inner satellite of the planet Uranus. Belinda was discovered from the images taken by Voyager 2 on 13 January 1986 and was given the temporary designation S/1986 U 5.[10] It is named after the heroine of Alexander Pope's The Rape of the Lock. It is also designated Uranus XIV.[11]

Belinda belongs to the Portia group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Juliet, Cupid, Rosalind, and Perdita.[9] These satellites have similar orbits and photometric properties.[9] Other than its orbit,[2] size of 128 × 64 km,[3] and geometric albedo of 0.08,[9] virtually nothing is known about it.

Voyager 2 images show Belinda as an elongated object with its major axis pointing towards Uranus. The moon is very elongated, with its short axis 0.5 ± 0.1 times the long axis.[3] Its surface is grey in color.[3]

Belinda is in a stable 44:43 mean-motion resonance with Perdita, and from this its mass has been determined to be roughly 26 times that of Perdita.[4]

The inner moon system is unstable over timescales of several millions of years. Belinda and Cupid will probably be the first pair of moons to collide, in 100,000 to 10 million years' time depending on the densities of the Portia-group satellites, due to resonant interactions with the much smaller Cupid.[8]

See also

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Notes

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  1. ^ a b c Calculated on the basis of other parameters.
  2. ^ Volume derived from the long axis A, the medium axis B and the short axis C:
  3. ^ It is known that Belinda is 26 times the mass of Perdita.[4] Perdita has a mean radius of 13.3±0.7 km[7] and a density at maximum of 0.9 g/cm3,[6] meaning its mass is at maximum 8.87×1015 kg, which makes Belinda's mass at maximum 2.3×1017 kg.
  4. ^ Maximum density obtained from the calculated maximum mass and the presupposed volume of ~270000 km3.
  5. ^ Surface gravity derived from the mass m, the gravitational constant G and the radius r:
  6. ^ Escape velocity derived from the mass m, the gravitational constant G and the radius r:

References

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Citations

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  1. ^ Benjamin Smith (1903). The Century Dictionary and Cyclopedia.
  2. ^ a b Jacobson 1998.
  3. ^ a b c d e f Karkoschka, Voyager 2001.
  4. ^ a b French, Robert S.; Showalter, Mark R.; de Pater, Imke; Lissauer, Jack J. (2017-10-01). Orbital and Photometric Analysis of the Inner Uranian Satellites from Hubble Images. Vol. 49. p. 214.19.
  5. ^ Showalter & Lissauer 2006.
  6. ^ a b Ćuk et al. 2022.
  7. ^ Showalter & Lissauer (2006),[5] as cited in Ćuk et al. (2022).[6]
  8. ^ a b 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. S2CID 9708287.
  9. ^ a b c d Karkoschka, Hubble 2001.
  10. ^ IAUC 4164.
  11. ^ USGS: Planet and Satellite Names and Discoverers.

Sources

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