Harpalyke (moon)

Harpalyke /hɑːrˈpæləkiː/, also known as Jupiter XXII, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2000, and given the temporary designation S/2000 J 5.^[6][1] In August 2003, the moon was named^[7] after Harpalyce, the incestuous daughter of Clymenus, who in some accounts was also a lover of Zeus (Jupiter).

Harpalyke

Harpalyke imaged by the Canada-France-Hawaii Telescope in December 2001
Discovery[1]
Discovered by	Scott S. Sheppard David C. Jewitt Yanga R. Fernandez Eugene A. Magnier
Discovery site	Mauna Kea Observatory
Discovery date	23 November 2000
Designations
Designation	Jupiter XXII
Pronunciation	/hɑːrˈpæləkiː/[2]
Named after	Ἁρπαλύκη Harpălykē
Alternative names	S/2000 J 5
Adjectives	Harpalykean /hɑːrpələˈkiːən/
Orbital characteristics[3]
Epoch 17 December 2020 (JD 2459200.5)
Observation arc	17.39 yr (6,350 days)
Semi-major axis	0.1422492 AU (21,280,180 km)
Eccentricity	0.1602677
Orbital period (sidereal)	–634.19 d
Mean anomaly	321.08380°
Mean motion	0° 34m 3.555s / day
Inclination	148.29788° (to ecliptic)
Longitude of ascending node	92.54746°
Argument of perihelion	193.28018°
Satellite of	Jupiter
Group	Ananke group
Physical characteristics[4]
Mean diameter	4 km
Albedo	0.04 (assumed)
Apparent magnitude	22.2[5]
Absolute magnitude (H)	15.9[3]

Harpalyke belongs to the Ananke group, believed to be the remnants of a break-up of a captured heliocentric asteroid.^[8][9] It is about 4 kilometres in diameter^[10] and appears grey (color index R-V=0.43), similar to C-type asteroids.^[11] The satellite orbits Jupiter at an average distance of 21,064,000 km in 634.19 days, at an inclination of 147° to the ecliptic (147° to Jupiter's equator) with an eccentricity of 0.2441.