Helene — moon orbiting Saturn, shown live in Cosmoscope, a real-time 3D map of the universe.
Dione’s leading trojan, its surface streaked by flows of ultra-fine dust that behave almost like a liquid in the feeble gravity.
Cosmoscope puts Helene at its true position in the solar system, computed from JPL-derived ephemeris and updated continuously. Open the live 3D view to see, in real time, how far Helene is from the Sun and from Earth right now, how many minutes or hours light takes to cross that gap, and how fast it is moving along its orbit. Scrub the timeline to place Helene where it was on any past date, or where it will be years from now.