Herse (moon)

Herse

Discovery
Discovered by	Brett J. Gladman John J. Kavelaars Jean-Marc Petit Lynne Allen
Discovery date	2003
Designations
Designation	Jupiter L
Pronunciation	/ˈhɜːrsiː/
Named after	Ἕρση Hersē
Alternative names	S/2003 J 17
Adjectives	Hersean /hɜːrˈsiːən/
Orbital characteristics [1]
Semi-major axis	23097000 km
Eccentricity	0.200
Orbital period (sidereal)	−715.4 days
Mean anomaly	41.90°
Inclination	164.2°
Longitude of ascending node	329.0°
Argument of perihelion	355.7°
Satellite of	Jupiter
Group	Carme group
Physical characteristics
Mean diameter	2 km
Apparent magnitude	23.4

Herse /ˈhɜːrsiː/, 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.^[2][3] It was named after Herse 'dew', by some accounts a daughter of Zeus and Selene the moon in Greek mythology,^[4] on 11 November 2009.^[5][6] Ersa (Jupiter LXXI) is also named for the same mythological figure.

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.^[7]

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°.

References

1. S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
2. Daniel W. E. Green, IAUC 8116: Satellites of Jupiter and Saturn 2003 April 11 (discovery)
3. Brian G. Marsden, MPEC 2003-G19: S/2003 J 17 2003 April 3 (discovery and ephemeris)
4. Keightley, p. 55; Hard, p. 46; Alcman, Fragment 57.
5. Jennifer S. Blue, L Named Herse Archived 2013-05-12 at the Wayback Machine, 2009 November 9
6. Jennifer S. Blue, IAUC 9094: Satellite of Jupiter (subscription required) 2009 November 11 (naming)
7. Planetary Satellite Mean Orbital Parameters, JPL