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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                   2025 March 29   
      
                                   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. A Lagrange point   
      is a gravitationally stable position near two massive bodies, in this   
      case Saturn and larger moon Dione. In fact, irregularly shaped ( about   
      36 by 32 by 30 kilometers) Helene orbits at Dione's leading Lagrange   
      point while brotherly ice moon Polydeuces follows at Dione's trailing   
      Lagrange point. The sharp stereo anaglyph was constructed from two   
      Cassini images captured during a close flyby in 2011. It shows part of   
      the Saturn-facing hemisphere of Helene mottled with craters and   
      gully-like features.   
      
                        Tomorrow's picture: Ringed Jupiter   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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