Herse (moon)

Herse /ˈhɜːrs/, or Jupiter L, previously known by its provisional designation of S/2003 J 17, is a natural satellite of Jupiter. It was discovered on 8 February 2003 by the astronomers Brett J. Gladman, John J. Kavelaars, Jean-Marc Petit, and Lynne Allen and also by a team of astronomers at the University of Hawaii. It was named after Herse 'dew', by some accounts a daughter of Zeus and Selene the moon in Greek mythology, on 11 November 2009. Ersa (Jupiter LXXI) is also named for the same mythological figure.

Herse
Discovery
Discovered byBrett J. Gladman
John J. Kavelaars
Jean-Marc Petit
Lynne Allen
Discovery date2003
Designations
Designation
Jupiter L
Pronunciation/ˈhɜːrs/
Named after
Ἕρση Hersē
Alternative names
S/2003 J 17
AdjectivesHersean /hɜːrˈsən/
Orbital characteristics
Semi-major axis
23097000 km
Eccentricity0.200
Orbital period (sidereal)
−715.4 days
Mean anomaly
41.90°
Inclination164.2°
Longitude of ascending node
329.0°
355.7°
Satellite ofJupiter
GroupCarme group
Physical characteristics
Mean diameter
2 km
23.4

    Herse is about 2 kilometres in diameter, and orbits Jupiter at an average distance of 22,134,000 km in 672.752 days, at a mean inclination of 165° to the ecliptic, in a retrograde direction and with a mean eccentricity of 0.2493.

    It is a member of the Carme group, made up of irregular retrograde moons orbiting Jupiter at a distance ranging between 23 and 24 Gm and at an inclination of about 165°.

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