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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 May 24   
      
                               Deimos Before Sunrise   
                          Image Credit: NASA, JPL-Caltech   
      
      Explanation: Deimos takes 30 hours and 18 minutes to complete one orbit   
      around the Red Planet. That's a little more than one Martian day or sol   
      which is about 24 hours and 40 minutes long, so Deimos drifts westward   
      across the Martian sky. About 15 kilometers across at its widest, the   
      smallest of Mars' two moons is bright though. In fact Deimos is the   
      brightest celestial object in this Martian skyscape captured before   
      sunrise by Perseverance on March 1, the 1,433rd sol of the Mars rover's   
      mission. The image is a composed of 16 exposures recorded by one of the   
      rover's navigation cameras. The individual exposures were combined into   
      a single image for an enhanced low light view. Regulus and Algeiba,   
      bright stars in the constellation Leo, are also visible in the dark   
      Martian predawn sky.   
      
                        Tomorrow's picture: beneath 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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