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Lysithea
Near-infrared photograph of Lysithea (center) by the 2MASS survey
Discovery  [1]
Discovered by Seth B. Nicholson
Discovery site Mt. Wilson Observatory
Discovery date6 July 1938
Designations
Designation
Jupiter X
Pronunciation /laɪˈsɪθiə/ [2] [3]
Named after
 Λυσιθέα Lysithea
AdjectivesLysithean /laɪˈsɪθiən/ [4]
Orbital characteristics  [5]
Epoch 27 April 2019 ( JD 2458600.5)
Observation arc79.87 yr (29,171 days)
0.0782144  AU (11,700,710 km)
Eccentricity0.1478734
+258.57 d
27.18992 °
1° 23m 32.227s / day
Inclination26.29254° (to ecliptic)
343.46495°
94.80010°
Satellite of Jupiter
Group Himalia group
Physical characteristics
Mean diameter
42.2±0.7 km ( WISE) [6]
42.2±3 km ( occultation) [7]: 6 
12.78±0.10  h [8]
Albedo0.036±0.006 [6]
Spectral type
 C/ P [6]
18.2 [9]
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

References

  1. ^ a b Nicholson, S. B. (October 1938). "Two New Satellites of Jupiter". Publications of the Astronomical Society of the Pacific. 50 (297): 292–293. Bibcode: 1938PASP...50..292N. doi: 10.1086/124963. S2CID  120216615.
  2. ^ "Lysithea". Dictionary.com Unabridged (Online). n.d.
  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. ^ a b "M.P.C. 115890" (PDF). Minor Planet Circular. Minor Planet Center. 27 August 2019.
  6. ^ a b c d Grav, T.; Bauer, J. M.; Mainzer, A. K.; Masiero, J. R.; Nugent, C. R.; Cutri, R. M.; et al. (August 2015). "NEOWISE: Observations of the Irregular Satellites of Jupiter and Saturn" (PDF). The Astrophysical Journal. 809 (1): 9. arXiv: 1505.07820. Bibcode: 2015ApJ...809....3G. doi: 10.1088/0004-637X/809/1/3. S2CID  5834661. 3.
  7. ^ Gomes-Júnior, A. R. (April 2021). "The Irregular Satellites of the Giant Planets" (PDF). Journal for Occultation Astronomy. 11 (2): 3–9. Bibcode: 2021JOA....11b...3G.
  8. ^ Luu, Jane (September 1991). "CCD photometry and spectroscopy of the outer Jovian satellites". Astronomical Journal. 102: 1213–1225. Bibcode: 1991AJ....102.1213L. doi: 10.1086/115949. ISSN  0004-6256.
  9. ^ Sheppard, Scott. "Scott S. Sheppard - Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. Retrieved 26 November 2020.
  10. ^ Marsden, Brian G. (7 October 1975). "Satellites of Jupiter". International Astronomical Union.
  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" (PDF). Astronomical Journal. 120 (5): 2679–2686. Bibcode: 2000AJ....120.2679J. doi: 10.1086/316817. S2CID  120372170.
  13. ^ Grav, Tommy; Holman, M. J.; Gladman, B. J.; Aksnes, K. (2003). "Photometric survey of the irregular satellites". Icarus. 166 (1): 33–45. arXiv: astro-ph/0301016. Bibcode: 2003Icar..166...33G. doi: 10.1016/j.icarus.2003.07.005. S2CID  7793999.

External links

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