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.

                              2020 February 21
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                       LDN 1622: Dark Nebula in Orion
                   Image Credit & [3]Copyright: [4]Min Xie

   Explanation: The silhouette of an intriguing [5]dark nebula inhabits
   this cosmic scene. Lynds' Dark Nebula ([6]LDN) 1622 appears against a
   faint background of glowing hydrogen gas only visible in long
   telescopic exposures of the region. In contrast, the brighter
   reflection nebula [7]vdB 62 is more easily seen, just above and right
   of center. LDN 1622 lies near the plane of our Milky Way Galaxy, close
   [8]on the sky to [9]Barnard's Loop, a large cloud surrounding the rich
   [10]complex of emission nebulae found in the Belt and Sword [11]of
   Orion. With swept-back outlines, the obscuring dust of LDN 1622 is
   thought to lie at a similar distance, perhaps 1,500 light-years away.
   At that distance, this 1 degree wide field of view would span about 30
   light-years. [12]Young stars do lie hidden within the dark expanse and
   have been revealed in Spitzer Space telescope [13]infrared images.
   Still, the foreboding visual appearance of LDN 1622 inspires its
   popular name, [14]the Boogeyman Nebula.

                   Tomorrow's picture: Central Centaurus A
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    Authors & editors: [26]Robert Nemiroff ([27]MTU) & [28]Jerry Bonnell
                                 ([29]UMCP)
          NASA Official: Phillip Newman [30]Specific rights apply.
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                A service of: [32]ASD at [33]NASA / [34]GSFC
                           & [35]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2002/ldn1622MinXie.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.astrobin.com/users/mxcoppell/
   5. http://en.wikipedia.org/wiki/Dark_nebula
   6. http://heasarc.gsfc.nasa.gov/W3Browse/nebula-catalog/ldn.html
   7. https://it.wikipedia.org/wiki/VdB_62
   8. https://apod.nasa.gov/apod/ap101023.html
   9. http://www.messier.seds.org/xtra/ngc/b-loop.html
  10. https://apod.nasa.gov/apod/ap070125.html
  11. http://www.gb.nrao.edu/~rmaddale/Education/OrionTourCenter/optical.html
  12. https://ui.adsabs.harvard.edu/abs/2009AJ....137.3843B/abstract
  13. https://www.researchgate.net/figure/The-L1622-cloud-as-seen-by-Spitzer-36-m-blue-8-m-green-and-24-m-red-Emission_fig10_235684871
  14. https://www.astrobin.com/26zj1a/?nc=user
  15. https://apod.nasa.gov/apod/ap200220.html
  16. https://apod.nasa.gov/apod/archivepix.html
  17. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  18. https://apod.nasa.gov/apod/lib/aptree.html
  19. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  20. https://apod.nasa.gov/apod/calendar/allyears.html
  21. https://apod.nasa.gov/apod.rss
  22. https://apod.nasa.gov/apod/lib/edlinks.html
  23. https://apod.nasa.gov/apod/lib/about_apod.html
  24. http://asterisk.apod.com/discuss_apod.php?date=200221
  25. https://apod.nasa.gov/apod/ap200222.html
  26. http://www.phy.mtu.edu/faculty/Nemiroff.html
  27. http://www.phy.mtu.edu/
  28. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  29. http://www.astro.umd.edu/
  30. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  31. https://www.nasa.gov/about/highlights/HP_Privacy.html
  32. https://astrophysics.gsfc.nasa.gov/
  33. https://www.nasa.gov/
  34. https://www.nasa.gov/centers/goddard/
  35. http://www.mtu.edu/