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.

                               2019 October 17
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                               Moons of Saturn
       Image Credit: [3]Cassini Imaging Team, [4]SSI, [5]JPL, [6]NASA

   Explanation: On July 29, 2011 the Cassini spacecraft's narrow-angle
   camera [7]took this snapshot and captured 5 [8]of Saturn's moons, from
   just above the ringplane. Left to right are small moons Janus and
   Pandora respectively 179 and 81 kilometers across, shiny 504 kilometer
   diameter Enceladus, and Mimas, 396 kilometers across, seen just next to
   Rhea. Cut off by the right edge of the frame, Rhea is Saturn's second
   largest moon at 1,528 kilometers across. So [9]how many moons does
   Saturn have? Twenty new found outer satellites bring its total to 82
   known moons, and since Jupiter's moon total stands at 79, Saturn is the
   Solar System's new moon king. [10]The newly announced Saturnian
   satellites are all very small, 5 kilometers or so in diameter, and most
   are in retrograde orbits inclined to Saturn's ringplane. You can help
   [11]name Saturn's new moons, but you should understand the rules. Hint:
   A knowledge of Norse, Inuit, and Gallic mythology will help.

                 Tomorrow's picture: interstellar interloper
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    Authors & editors: [23]Robert Nemiroff ([24]MTU) & [25]Jerry Bonnell
                                 ([26]UMCP)
          NASA Official: Phillip Newman [27]Specific rights apply.
              [28]NASA Web Privacy Policy and Important Notices
                A service of: [29]ASD at [30]NASA / [31]GSFC
                           & [32]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1910/PIA12797-full.jpg
   3. http://ciclops.org/
   4. http://www.spacescience.org/
   5. http://www.jpl.nasa.gov/
   6. http://www.nasa.gov/
   7. https://photojournal.jpl.nasa.gov/catalog/?IDNumber=PIA12797
   8. https://solarsystem.nasa.gov/resources/all/?order=pub_date+desc&per_page=50&page=0&search=&fs=&fc=&ft=saturn+moons&dp=&category=
   9. https://solarsystem.nasa.gov/moons/in-depth/
  10. https://carnegiescience.edu/news/saturn-surpasses-jupiter-after-discovery-20-new-moons-and-you-can-help-name-them
  11. https://carnegiescience.edu/NameSaturnsMoons
  12. https://apod.nasa.gov/apod/ap191016.html
  13. https://apod.nasa.gov/apod/archivepix.html
  14. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  15. https://apod.nasa.gov/apod/lib/aptree.html
  16. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  17. https://apod.nasa.gov/apod/calendar/allyears.html
  18. https://apod.nasa.gov/apod.rss
  19. https://apod.nasa.gov/apod/lib/edlinks.html
  20. https://apod.nasa.gov/apod/lib/about_apod.html
  21. http://asterisk.apod.com/discuss_apod.php?date=191017
  22. https://apod.nasa.gov/apod/ap191018.html
  23. http://www.phy.mtu.edu/faculty/Nemiroff.html
  24. http://www.phy.mtu.edu/
  25. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  26. http://www.astro.umd.edu/
  27. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  28. https://www.nasa.gov/about/highlights/HP_Privacy.html
  29. https://astrophysics.gsfc.nasa.gov/
  30. https://www.nasa.gov/
  31. https://www.nasa.gov/centers/goddard/
  32. http://www.mtu.edu/