Lysithea (moon)

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
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 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 ofJupiter
GroupHimalia 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 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. 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. "M.P.C. 115890" (PDF). Minor Planet Circular. Minor Planet Center. 27 August 2019.
    6. 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.
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