Saturns Moon Helene in Color . ... Credit Copyright: NASA / JPL / SSI ; Color Composite: Daniel Machюcek Explanation: Although its colors may be subtle, Saturn's moon Helene is an enigma in any light. ... Helene is also unusual because it circles Saturn just ahead of the large moon Dione , making it one of only four known Saturnian moons to occupy a gravitational well known as a stable Lagrange point . Dark Mysteries: Astronomy Seminar of the Week . ... NASA Official: Jay Norris. ...