                 APOD: 2018 March 15 - Catalog Entry Number 1

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                2018 March 15
                                      [2]
                            Catalog Entry Number 1
          Image Credit & Copyright [3] : Bernhard Hubl (CEDIC [5] )

Explanation: Every journey has first step and every catalog a first entry [6]
. First entries in six well-known deep sky catalogs appear in these panels,
from upper left to lower right in chronological order of original catalog
publication. From 1774 [7] , Charles Messier's catalog [8]  entry number 1 is
M1, famous cosmic crustacean and supernova remnant the Crab Nebula. J.L.E.
Dreyer's [9] (not so new) New General Catalog was published in 1888. A spiral
galaxy in Pegasus, his NGC 1 is centered in the next panel. Just below it in
the frame is another spiral galaxy cataloged as NGC 2 [10] . In Dreyer's
follow-on Index Catalog (next panel), IC 1 is actually a faint double star,
though. Now recognized as part of the Perseus molecular cloud complex, dark
nebula Barnard 1 begins the bottom row from Dark Markings of the Sky [11] , a
1919 catalog by E.E. Barnard. Abell 1 is a distant galaxy cluster in Pegasus,
from George Abell's 1958 [12] catalog of Rich Clusters of Galaxies. The final
panel is centered on vdB 1, from Sidney van den Bergh's [13]  1966 study. The
pretty, blue galactic reflection nebula [14] is found in the constellation
Cassiopeia.

                  Tomorrow's picture: birds of a feather [15]

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Site notes:
  [1] archivepix.html
  [2] image/1803/M001-2Hubl_big.jpg
  [3] lib/about_apod.html#srapply
  [4] http://astrophoton.com/about_me.htm
  [5] http://www.cedic.at/
  [6] http://astrophoton.com/M001-2.htm
  [7] http://www.messier.seds.org/xtra/history/m-cat.html
  [8] https://www.nasa.gov/content/goddard/ hubble-s-messier-catalog
  [9] http://star.arm.ac.uk/history/dreyer.html
  [10] ap050819.html
  [11] http://adsabs.harvard.edu/cgi-bin/bib_query?1919ApJ....49....1B
  [12] http://adsabs.harvard.edu/cgi-bin/
nph-bib_query?bibcode=1958ApJS....3..211A
  [13] http://adsabs.harvard.edu/abs/1966AJ.....71..990V
  [14] ap121026.html
  [15] ap180316.html
  [16] ap180314.html
  [17] archivepix.html
  [18] lib/apsubmit2015.html
  [19] lib/aptree.html
  [20] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [21] calendar/allyears.html
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  [24] lib/about_apod.html
  [25] http://asterisk.apod.com/discuss_apod.php?date=180315
  [26] ap180316.html
  [27] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [28] http://www.phy.mtu.edu/
  [29] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [30] http://www.astro.umd.edu/
  [31] lib/about_apod.html#srapply
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