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.

                              2021 November 21
    [2]The featured image shows an image of Comet Leonard complete with a
       green coma and a dust tail. Please see the explanation for more
                            detailed information.

                          Introducing Comet Leonard
                  Image Credit & Copyright: [3]Dan Bartlett

   Explanation: Here comes Comet Leonard. Comet [4]C/2021 A1 (Leonard) was
   discovered as a faint smudge in January 2021 when it was out past
   [5]Mars -- but its [6]orbit will take the [7]giant shedding ice-ball
   into the inner Solar System, passing near both [8]Earth and Venus in
   December before it swoops around the Sun in early January 2022.
   Although comets are notoriously [9]hard to predict, some estimations
   have [10]Comet Leonard brightening to become visible to the [11]unaided
   eye in December. [12]Comet Leonard was captured just over a week ago
   already sporting a [13]green-tinged coma and an extended [14]dust tail.
   The featured picture was composed from 62 images taken through a
   moderate-sized telescope -- one set of exposures tracking the comet,
   while another set tracking the background stars. The exposures were
   taken from the dark skies above the [15]Eastern Sierra Mountains, near
   [16]June Lake in [17]California, [18]USA. Soon after passing near the
   Earth in mid-December, the comet will shift from northern to southern
   skies.

      APOD Editor (RJN) Online Monday: [19]NASA's Best Space Images (&
                                   Videos)
                      Tomorrow's picture: moon building
     __________________________________________________________________

      [20]< | [21]Archive | [22]Submissions | [23]Index | [24]Search |
   [25]Calendar | [26]RSS | [27]Education | [28]About APOD | [29]Discuss |
                                    [30]>
     __________________________________________________________________

    Authors & editors: [31]Robert Nemiroff ([32]MTU) & [33]Jerry Bonnell
                                 ([34]UMCP)
          NASA Official: Phillip Newman [35]Specific rights apply.
              [36]NASA Web Privacy Policy and Important Notices
                A service of: [37]ASD at [38]NASA / [39]GSFC
                           & [40]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2111/CometLeonard_Bartlett_4006.jpg
   3. mailto:%20h2ologg%20@at@%20yahoo%20.dot.%20com
   4. https://en.wikipedia.org/wiki/C/2021_A1_(Leonard)
   5. https://solarsystem.nasa.gov/planets/mars/overview/
   6. https://theskylive.com/3dsolarsystem?obj=cometleonard
   7. https://apod.nasa.gov/apod/ap101123.html
   8. https://apod.nasa.gov/apod/ap200603.html
   9. https://cdn-bdkpk.nitrocdn.com/bqXZGjFxWFeYMLUltSZDYbdHljYpzWXe/assets/static/optimized/rev-8737f8e/wp-content/uploads/2020/03/dog_body_language_x1-scaled.jpg
  10. https://theskylive.com/cometleonard-info#brightness
  11. https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/how-eyes-work
  12. https://skyandtelescope.org/astronomy-news/how-bright-will-comet-leonard-get/
  13. https://apod.nasa.gov/apod/ap170212.html
  14. https://apod.nasa.gov/apod/ap210308.html
  15. https://youtu.be/bAp-uzfIeto
  16. https://youtu.be/iXATJO5jec8
  17. https://en.wikipedia.org/wiki/California
  18. https://en.wikipedia.org/wiki/United_States
  19. https://events.mtu.edu/event/nasas_best_space_images_6358
  20. https://apod.nasa.gov/apod/ap211120.html
  21. https://apod.nasa.gov/apod/archivepix.html
  22. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  23. https://apod.nasa.gov/apod/lib/aptree.html
  24. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  25. https://apod.nasa.gov/apod/calendar/allyears.html
  26. https://apod.nasa.gov/apod.rss
  27. https://apod.nasa.gov/apod/lib/edlinks.html
  28. https://apod.nasa.gov/apod/lib/about_apod.html
  29. http://asterisk.apod.com/discuss_apod.php?date=211121
  30. https://apod.nasa.gov/apod/ap211122.html
  31. http://www.phy.mtu.edu/faculty/Nemiroff.html
  32. http://www.phy.mtu.edu/
  33. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  34. http://www.astro.umd.edu/
  35. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  36. https://www.nasa.gov/about/highlights/HP_Privacy.html
  37. https://astrophysics.gsfc.nasa.gov/
  38. https://www.nasa.gov/
  39. https://www.nasa.gov/centers/goddard/
  40. http://www.mtu.edu/