Callirrhoe articles
Deeper dives into Callirrhoe, sourced from NASA, JPL and the scientific literature.
How asteroid 1999 UX18 became Jupiter XVII
The story of a faint dot that turned out to be circling a planet rather than the Sun.
Read →Spacewatch: the survey that found Callirrhoe
Founded in 1980, Spacewatch has hunted asteroids and comets from Kitt Peak for longer than any similar program still running.
Read →What you can — and can’t — see of Jupiter’s moons
Galileo’s four moons are easy. The other hundred-plus need some of the largest telescopes on Earth.
Read →