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 30

         IFRAME: [2]https://www.youtube.com/embed/VYWjxvm14Pk?rel=0

                         In Motion: Uranus and Moons
    Video Credit: [3]David Campbell ([4]U. Hertfordshire), [5]Bayfordbury
                                 Observatory

   Explanation: What's that moving across the sky? A planet just a bit too
   faint to see with the unaided eye: [6]Uranus. The gas giant out [7]past
   Saturn was tracked earlier this month near [8]opposition -- when it was
   closest to Earth and at its brightest. The [9]featured video captured
   by the [10]Bayfordbury [11]Observatory in [12]Hertfordshire, [13]UK is
   a four-hour time-lapse [14]showing Uranus with its four largest moons
   in tow: [15]Titania, [16]Oberon, [17]Umbriel and [18]Ariel. Uranus'
   apparent motion past background stars is [19]really dominated by
   Earth's own orbital motion around our Sun. The cross seen centered on
   [20]Uranus is called a [21]diffraction spike and is caused by light
   [22]diffracting around the four arms that hold one of [23]the
   telescope's mirrors in place. The rotation of the diffraction spikes is
   not caused by the [24]rotation of Uranus but, essentially, by the
   [25]rotation of the Earth. During the next few months [26]Uranus itself
   will be visible with binoculars, but, as always, to see its moons will
   require [27]a telescope.

                   Tomorrow's picture: the blood moon band
     __________________________________________________________________

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    Authors & editors: [39]Robert Nemiroff ([40]MTU) & [41]Jerry Bonnell
                                 ([42]UMCP)
          NASA Official: Phillip Newman [43]Specific rights apply.
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                A service of: [45]ASD at [46]NASA / [47]GSFC
                           & [48]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://www.youtube.com/embed/VYWjxvm14Pk?rel=0
   3. mailto:%20d.a.campbell2%20at%20herts.ac.uk
   4. https://www.herts.ac.uk/research/centres/car
   5. https://www.herts.ac.uk/bayfordbury/bayfordbury-observatory/people-at-bayfordbury
   6. https://solarsystem.nasa.gov/planets/uranus/in-depth/
   7. https://apod.nasa.gov/apod/ap170911.html
   8. https://blogs.nasa.gov/Watch_the_Skies/wp-content/uploads/sites/193/2020/10/Opposition_Conjunction.jpg
   9. https://twitter.com/BayfordburyObs/status/1456602305881575434
  10. https://www.herts.ac.uk/bayfordbury/bayfordbury-observatory/visit-bayfordbury-observatory
  11. https://en.wikipedia.org/wiki/Bayfordbury_Observatory#/media/File:Bayfordbury_campus_(27115264794).jpg
  12. https://en.wikipedia.org/wiki/Hertfordshire
  13. https://en.wikipedia.org/wiki/United_Kingdom
  14. https://pds-rings.seti.org/tools/ephem2_ura.shtml
  15. https://apod.nasa.gov/apod/ap000930.html
  16. https://solarsystem.nasa.gov/moons/uranus-moons/oberon/in-depth/
  17. https://en.wikipedia.org/wiki/Umbriel_(moon)
  18. https://solarsystem.nasa.gov/moons/uranus-moons/ariel/in-depth/
  19. https://apod.nasa.gov/apod/ap201212.html
  20. https://youtu.be/m4NXbFOiOGk
  21. https://en.wikipedia.org/wiki/Diffraction_spike
  22. http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/mch/diff.rxml
  23. https://www.flickr.com/photos/bayfordburyobs/51674803383
  24. https://youtu.be/H7sJvvKagiA
  25. https://apod.nasa.gov/apod/ap200701.html
  26. https://earthsky.org/astronomy-essentials/uranus-at-opposition-closest-brightest-best/
  27. https://1funny.com/wp-content/uploads/2010/12/dog-telescope.jpg
  28. https://apod.nasa.gov/apod/ap211129.html
  29. https://apod.nasa.gov/apod/archivepix.html
  30. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  31. https://apod.nasa.gov/apod/lib/aptree.html
  32. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  33. https://apod.nasa.gov/apod/calendar/allyears.html
  34. https://apod.nasa.gov/apod.rss
  35. https://apod.nasa.gov/apod/lib/edlinks.html
  36. https://apod.nasa.gov/apod/lib/about_apod.html
  37. http://asterisk.apod.com/discuss_apod.php?date=211130
  38. https://apod.nasa.gov/apod/ap211201.html
  39. http://www.phy.mtu.edu/faculty/Nemiroff.html
  40. http://www.phy.mtu.edu/
  41. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  42. http://www.astro.umd.edu/
  43. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  44. https://www.nasa.gov/about/highlights/HP_Privacy.html
  45. https://astrophysics.gsfc.nasa.gov/
  46. https://www.nasa.gov/
  47. https://www.nasa.gov/centers/goddard/
  48. http://www.mtu.edu/