Helene (moon) - Wikipedia
网页Helene / ˈhɛləniː / is a moon of Saturn. It was discovered by Pierre Laques and Jean Lecacheux in 1980 from ground-based observations at Pic du Midi Observatory, [1] and was designated S/1980 S 6. [8] In 1988 it was officially named after Helen of Troy, who was the granddaughter of Cronus (Saturn) in Greek mythology. [9]
Helene - NASA Science
网页Helene, a small and faint moon of Saturn, is referred to as a Trojan moon because it shares its orbit with another moon—Dione, a moon hundreds of times larger than Helene. This complex orbital arrangement is held steady by gravity: Helene is located at a Lagrange point, where it feels the tug of gravity equally from distant Saturn and nearby ...
APOD: 2024 June 1 - Stereo Helene - Astronomy Picture of the Day
网页Stereo Helene Image Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA; Stereo Image by Roberto Beltramini. Explanation: Get out your red/blue glasses and float next to Helene, small, icy moon of Saturn. Appropriately named, Helene is a Trojan moon, so called because it orbits at a Lagrange point.
APOD: 2019 June 15 - Stereo Helene
网页2019年6月15日 · Stereo Helene. Image Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA; Stereo Image by Roberto Beltramini. Explanation: Get out your red/blue glasses and float next to Helene, small, icy moon of Saturn. Appropriately named, Helene is one of four known Trojan moons, so called because it orbits at a Lagrange point.
Helene Moon: The Leading Trojan of Dione
网页Helene is a natural satellite of Saturn discovered in 1980. It is also called Saturn XII and Dione B. The latter name was given because Helene is the leading trojan of the larger moon Dione. Another moon sharing the orbit with Dione …
Helene - NASA Science
网页2006年12月29日 · Helene (32 kilometers, or 20 miles across) orbits 60 degrees ahead of Dione in the larger moon's orbit, making it a “trojan” moon of Dione. Trojan moons are named for the Trojan group of asteroids that orbit 60 degrees ahead of and behind Jupiter as it circles the sun.
Cassini Captures Ice Queen Helene - NASA
网页2011年6月20日 · NASA’s Cassini spacecraft successfully completed its second-closest encounter with Saturn’s icy moon Helene on June 18, 2011, beaming down raw images of the small moon. At closest approach, Cassini flew within 4,330 miles (6,968 kilometers) of Helene’s surface. It was the second closest approach to Helene of the entire mission.
APOD: 2011 June 23 - Stereo Helene
网页2011年6月23日 · Stereo Helene. Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA; Stereo Image by Roberto Beltramini. Explanation: Get out your red/blue glasses and float next to Helene, small, icy moon of Saturn. Appropriately named, Helene is one of four known Trojan moons, so called because it orbits at a Lagrange point.
Helene's Close-up - NASA Jet Propulsion Laboratory (JPL)
网页2006年9月15日 · This set of images exposes details on small and crumpled-looking Helene. Large portions of this Trojan moon of Dione appear to have been blasted away by impacts. This image was captured by NASA's Cassini spacecraft.
Cassini Captures Ice Queen Helene - NASA Jet Propulsion …
网页2011年6月20日 · NASA's Cassini spacecraft has successfully completed its second-closest encounter with Saturn's icy moon Helene, beaming down raw images of the small moon. At closest approach, on June 18, Cassini flew within 4,330 miles (6,968 kilometers) of …
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