Callirrhoe or Jupiter XVII, is one of Jupiter's farthest named moons. It was found by Spacewatch on October 6, 1999 and originally designated as an asteroid (1999 UX18). It was found to be in orbit around Jupiter by Tim Spahr on July 18, 2000, and then given the designation S/1999 J 1.
Callirrhoe is about 8.6 kilometres in diameter, and orbits Jupiter at an average distance of 24,356,000 km in 776.543 days, at an inclination of 141° to the ecliptic (140° to Jupiter's equator), with an orbital eccentricity of 0.264.
As a navigation exercise, the New Horizons spacecraft imaged it on January 10, 2007.
- MPS 7418 (Minor Planet Circulars Supplement); not available on-line
- IAUC 7460: S/1999 J 1 2000 July 20 (discovery)
- MPEC 2000-Y16: S/1975 J 1 = S/2000 J 1, S/1999 J 1 2000 December 19 (discovery and ephemeris)
- IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)