Astronomy:Lysithea (moon)

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Short description: Outer moon of Jupiter
Lysithea
Lysithea 2MASS JHK color composite.png
Near-infrared photograph of Lysithea (center) by the 2MASS survey
Discovery [1]
Discovered bySeth B. Nicholson
Discovery siteMt. Wilson Observatory
Discovery date6 July 1938
Designations
Designation
Jupiter X
Pronunciation/laɪˈsɪθiə/[2][3]
Named afterΛυσιθέα Lysithea
AdjectivesLysithean /laɪˈsɪθiən/[4]
Orbital characteristics [5]
Epoch 27 April 2019 (JD 2458600.5)
Observation arc79.87 yr (29,171 days)
0.0782144 astronomical unit|AU (11,700,710 km)
Eccentricity0.1478734
Orbital period+258.57 d
Mean anomaly27.18992°
Mean motion1° 23m 32.227s / day
Inclination26.29254° (to ecliptic)
Longitude of ascending node343.46495°
94.80010°
Satellite ofJupiter
GroupHimalia group
Physical characteristics
Mean diameter42.2±0.7 km (WISE)[6]
42.2±3 km (occultation)[7](p6)
Rotation period12.78±0.10 h[8]
Albedo0.036±0.006[6]
Spectral type
C/P[6]
Apparent magnitude18.2[9]
Absolute magnitude (H)11.2[5]


Lysithea /laɪˈsɪθiə/ is a prograde irregular satellite of Jupiter. It was discovered by Seth Barnes Nicholson in 1938 at Mount Wilson Observatory[1] and is named after the mythological Lysithea, daughter of Oceanus and one of Zeus' lovers.[10]

Lysithea did not receive its present name until 1975; before then, it was simply known as Jupiter X. It was sometimes called "Demeter"[11] from 1955 to 1975.

It belongs to the Himalia group, moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 28.3°.[12] Its orbital elements are as of January 2000. They are continuously changing due to solar and planetary perturbations. It is gray in color (B−V=0.72, V−R=0.36, V−I=0.74) and intermediate between C-type and P-type asteroids.[13][6]

Lysithea observed by the Wide-field Infrared Survey Explorer (WISE) spacecraft in 2014

See also

  • Irregular satellites
  • Jupiter's moons in fiction

References

  1. ↑ 1.0 1.1 Nicholson, S. B. (October 1938). "Two New Satellites of Jupiter". Publications of the Astronomical Society of the Pacific 50 (297): 292–293. doi:10.1086/124963. Bibcode: 1938PASP...50..292N. http://adsabs.harvard.edu//full/seri/PASP./0050//0000292.000.html. 
  2. ↑ "Lysithea". Dictionary.com Unabridged. Random House. https://www.dictionary.com/browse/Lysithea. 
  3. ↑ Cf. also 'Lysithous' in Noah Webster (1884) A Practical Dictionary of the English Language
  4. ↑ Yenne (1987) The Atlas of the Solar System.
  5. ↑ 5.0 5.1 "M.P.C. 115890". Minor Planet Circular. Minor Planet Center. 27 August 2019. https://minorplanetcenter.net/iau/ECS/MPCArchive/2019/MPC_20190827.pdf. 
  6. ↑ 6.0 6.1 6.2 6.3 Grav, T.Expression error: Unrecognized word "etal". (August 2015). "NEOWISE: Observations of the Irregular Satellites of Jupiter and Saturn". The Astrophysical Journal 809 (1): 9. doi:10.1088/0004-637X/809/1/3. 3. Bibcode: 2015ApJ...809....3G. https://authors.library.caltech.edu/61254/1/Grav_2015.pdf. 
  7. ↑ Gomes-Júnior, A. R. (April 2021). "The Irregular Satellites of the Giant Planets". Journal for Occultation Astronomy 11 (2): 3–9. Bibcode: 2021JOA....11b...3G. https://iota-es.de/JOA/JOA2021_2.pdf. 
  8. ↑ Luu, Jane (September 1991). "CCD photometry and spectroscopy of the outer Jovian satellites". Astronomical Journal 102: 1213–1225. doi:10.1086/115949. ISSN 0004-6256. Bibcode: 1991AJ....102.1213L. 
  9. ↑ Sheppard, Scott. "Scott S. Sheppard - Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. https://sites.google.com/carnegiescience.edu/sheppard/moons/jupitermoons. 
  10. ↑ Marsden, Brian G. (1975-10-07). "Satellites of Jupiter". International Astronomical Union. http://www.cbat.eps.harvard.edu/iauc/02800/02846.html. 
  11. ↑ Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-478107-4. 
  12. ↑ Jacobson, R.A. (2000). "The orbits of outer Jovian satellites". Astronomical Journal 120 (5): 2679–2686. doi:10.1086/316817. Bibcode: 2000AJ....120.2679J. https://trs.jpl.nasa.gov/bitstream/2014/15175/1/00-1187.pdf. 
  13. ↑ Grav, Tommy; Holman, M. J.; Gladman, B. J.; Aksnes, K. (2003). "Photometric survey of the irregular satellites". Icarus 166 (1): 33–45. doi:10.1016/j.icarus.2003.07.005. Bibcode: 2003Icar..166...33G. 

External links



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