|Helene imaged from a distance of 340,000 km by Cassini
June 18, 2011. Image credit: NASA/JPL-Caltech/Space Science Institute
Helene is a small moon of Saturn. It was discovered
on March 1, 1980, from ground-based observations at Pic du Midi Observatory
and is also known as Saturn XII. It is said to be a Dione trojan because it shares the same orbit as its larger companion,
preceding it by 60°. Large portions of Helene appear to have been blasted
away by impacts.
|Helene imaged from a distance of 340,000 km by Voyager
2. Image credit: NASAL/JPL
The closest encounter of any spacecraft with Helene took place on March
10, 2010, when Cassini flew within 1,820
kilometers (1,131 miles) of the moon.
||1980, by P. Laques and J. Lecacheux
||377,396 km (234,553 miles)
||36 × 32 × 30 km (22 × 20 × 19
||2.737 days (2 days 17 hr 41 min.)