Astronomy Picture of the Day

   [1]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.

                               2022 January 23
    [2]The featured image shows Saturn, its rings nearly edge-on, shadows
    of its rings on the planet's face, and the ice-moon Tethys. The image
      was taken by Cassini in 2005. Please see the explanation for more
                            detailed information.

                     Saturn, Tethys, Rings, and Shadows
   Image Credit: [3]Cassini Imaging Team, [4]SSI, [5]JPL, [6]ESA, [7]NASA

   Explanation: Seen from [8]ice moon Tethys, rings and shadows would
   display fantastic views of the Saturnian system. Haven't [9]dropped in
   on Tethys lately? Then [10]this gorgeous ringscape from the Cassini
   spacecraft will have to do for now. Caught [11]in sunlight just below
   and left of picture center in 2005, Tethys itself is about 1,000
   kilometers in diameter and orbits not quite [12]five saturn-radii from
   the center of the gas giant planet. At that distance (around 300,000
   kilometers) it is well outside Saturn's [13]main bright rings, but
   Tethys is still [14]one of five major moons that find themselves within
   the boundaries of the faint and tenuous outer [15]E ring. Discovered in
   the 1980s, two very small moons [16]Telesto and [17]Calypso are locked
   in stable [18]along Tethys' orbit. Telesto precedes and Calypso
   [19]follows Tethys as the trio [20]circles Saturn.

                       Tomorrow's picture: witch star?
     __________________________________________________________________

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    Authors & editors: [32]Robert Nemiroff ([33]MTU) & [34]Jerry Bonnell
                                 ([35]UMCP)
          NASA Official: Phillip Newman [36]Specific rights apply.
              [37]NASA Web Privacy Policy and Important Notices
                A service of: [38]ASD at [39]NASA / [40]GSFC
                           & [41]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2201/TethysRingShadow_cassini_1080.jpg
   3. https://ciclops.org/
   4. https://www.spacescience.org/
   5. https://www.jpl.nasa.gov/
   6. https://www.esa.int/
   7. https://www.nasa.gov/
   8. https://solarsystem.nasa.gov/moons/saturn-moons/tethys/in-depth/
   9. https://apod.nasa.gov/apod/ap050117.html
  10. https://photojournal.jpl.nasa.gov/catalog/PIA07545
  11. https://apod.nasa.gov/apod/ap041202.html
  12. https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html
  13. https://en.wikipedia.org/wiki/Rings_of_Saturn
  14. https://apod.nasa.gov/apod/ap140406.html
  15. https://apod.nasa.gov/apod/ap070327.html
  16. https://apod.nasa.gov/apod/ap060222.html
  17. https://solarsystem.nasa.gov/moons/saturn-moons/calypso/in-depth/
  18. https://solarsystem.nasa.gov/resources/754/what-is-a-lagrange-point/
  19. https://ichef.bbci.co.uk/news/549/cpsprodpb/1261C/production/_100729257_photojan0574306am.jpg
  20. http://www.orbitsimulator.com/gravity/articles/tethys.html
  21. https://apod.nasa.gov/apod/ap220122.html
  22. https://apod.nasa.gov/apod/archivepix.html
  23. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  24. https://apod.nasa.gov/apod/lib/aptree.html
  25. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  26. https://apod.nasa.gov/apod/calendar/allyears.html
  27. https://apod.nasa.gov/apod.rss
  28. https://apod.nasa.gov/apod/lib/edlinks.html
  29. https://apod.nasa.gov/apod/lib/about_apod.html
  30. http://asterisk.apod.com/discuss_apod.php?date=220123
  31. https://apod.nasa.gov/apod/ap220124.html
  32. http://www.phy.mtu.edu/faculty/Nemiroff.html
  33. http://www.phy.mtu.edu/
  34. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  35. http://www.astro.umd.edu/
  36. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  37. https://www.nasa.gov/about/highlights/HP_Privacy.html
  38. https://astrophysics.gsfc.nasa.gov/
  39. https://www.nasa.gov/
  40. https://www.nasa.gov/centers/goddard/
  41. http://www.mtu.edu/