Pasiphae (moon)

Source: Wikipedia, the free encyclopedia.
Not to be confused with Pasithee (moon).

Pasiphae
Pasiphae photographed by the Haute-Provence Observatory in August 1998
Discovery[1]
Discovered byPhilibert J. Melotte
Discovery siteRoyal Observatory, Greenwich
Discovery date27 January 1908
Designations
Designation
Jupiter VIII
Pronunciation/pəˈsɪfeɪ.iː/[2][3]
Named after
Πασιφάη Pāsiphaē
1908 CJ
AdjectivesPasiphaëan /ˌpæsɪfeɪˈiːən/[4]
Orbital characteristics[5]
Epoch 23 March 2018 (JD 2458200.5)
Observation arc110.34 yr (40,303 days)
0.1551422 AU (23,208,940 km)
Eccentricity0.6110162
–722.34 d
259.25505°
0° 29m 54.18s / day
Inclination153.40903° (to ecliptic)
19.11682°
241.59647°
Satellite ofJupiter
GroupPasiphae group
Physical characteristics
Mean diameter
57.8±0.8 km[6]
Mass1.72×1017 kg (calculated)
Mean density
1.70 g/cm3 (assumed)[7]
Albedo0.044±0.006[6]
16.9[8]
10.1[5]

Pasiphae

irregular satellite of Jupiter. It was discovered in 1908 by Philibert Jacques Melotte[1][10] and later named after the mythological Pasiphaë, wife of Minos and mother of the Minotaur from Greek legend
.

The moon was first spotted on a plate taken at the

provisional designation 1908 CJ, as it was not clear whether it was an asteroid or a moon of Jupiter. The recognition of the latter case came by April 10.[11]

Pasiphae did not receive its present name until 1975;[12] before then, it was simply known as Jupiter VIII. It was sometimes called "Poseidon"[13] between 1955 and 1975.

Orbit

Retrograde irregular satellites of Jupiter.

Pasiphae orbits Jupiter on a high eccentricity and high inclination retrograde orbit. It gives its name to the

inclinations ranging between 144.5° and 158.3°.[14] The orbital elements are as of January 2000.[15] They are continuously changing due to solar and planetary perturbations. The diagram illustrates its orbit in relation to other retrograde irregular satellites of Jupiter. The eccentricity of selected orbits is represented by the yellow segments (extending from the pericentre to the apocentre). The outermost regular satellite Callisto
is located for reference.

Pasiphae is also known to be in a secular resonance with Jupiter (tying the longitude of its perijove with the longitude of perihelion of Jupiter).[16]

Physical characteristics

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

With a diameter estimated at 58 km, Pasiphae is the largest retrograde and third largest irregular satellite after Himalia and Elara.

Spectroscopical measurements in infrared indicate that Pasiphae is a spectrally featureless object, consistent with the suspected asteroidal origin of the object. Pasiphae is believed to be a fragment from a captured asteroid along with other Pasiphae group satellites.[17][18]

In the visual spectrum the satellite appears grey (colour indices B-V=0.74, R-V=0.38) similar to C-type asteroids.[19]

See also

  • Irregular satellite

References

  1. ^
    doi:10.1093/mnras/68.6.456
    .
  2. ^ Noah Webster (1884). A Practical Dictionary of the English Language.
  3. ^ "Pasiphae". Dictionary.com Unabridged (Online). n.d.
  4. ^ Laurent Milesi (2003). James Joyce and the difference of language. p. 149.
  5. ^ a b "M.P.C. 111777" (PDF). Minor Planet Circular. Minor Planet Center. 25 September 2018.
  6. ^
    S2CID 5834661
    . 3.
  7. ISSN 0035-8711
    .
  8. ^ Sheppard, Scott. "Scott S. Sheppard - Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. Retrieved 26 November 2020.
  9. ^ "Planetary Names: Planet and Satellite Names and Discoverers".
  10. doi:10.1086/121815
    .
  11. doi:10.1093/mnras/68.5.373
    .
  12. ^ IAUC 2846: Satellites of Jupiter 7 October 1974 (naming the moon)
  13. ISBN 0-134-78107-4
    .
  14. ISBN 0-521-81808-7
    , 2004, pp. 263-280
  15. S2CID 120372170
    .
  16. doi:10.1086/382099
    .
  17. S2CID 15143844
    .
  18. ^ Sheppard, S. S.; and Jewitt, D. C.; An Abundant Population of Small Irregular Satellites Around Jupiter Archived 5 August 2003 at the Wayback Machine, Nature, Vol. 423 (May 2003), pp. 261-263
  19. Grav, T.; Holman, M. J.; Gladman, B. J.; and Aksnes, K.; Photometric Survey of the Irregular Satellites
    , Icarus, Vol. 166 (2003), pp. 33-45

External links
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