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  1. #1
    ukastronomy's Avatar
    ukastronomy Guest

    Default NGC 891 (Caldwell 23) in Andromeda



    The NGC Ten Minute Challenge

    NGC 891 (Caldwell 23) in Andromeda

    NGC 891 (or Caldwell 23) is a edge-on spiral galaxy with a distinct
    dust lane. It was discovered by William Herschel in October 1784. This
    galaxy is perhaps the best example of a near-by spiral galaxy viewed
    edgewise. Note the small companion galaxies above and beneath the
    disk.

    http://www.martin-nicholson.info/ten...ngc/ngc891.htm

    Martin Nicholson, Daventry, England.
    http://www.martin-nicholson.info/1/1a.htm

  2. #2
    David Knisely's Avatar
    David Knisely Guest

    Default NGC 891 (Caldwell 23) in Andromeda

    It is most properly referred to as NGC 891, although one may see it
    referred to as H-19-5 (Herschel number) or UGC 1821 or CGCG 538-52 or
    PGC 9031 (or any number of other scientific catalog numbers or
    designations for the galaxy). While it may be the 23rd entry in Patrick
    Moore's Caldwell "list", the above designations are probably somewhat
    more appropriate for astronomical reference. Clear skies to you.
    --
    David W. Knisely
    Prairie Astronomy Club: http://www.prairieastronomyclub.org
    Hyde Memorial Observatory: http://www.hydeobservatory.info/

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  3. #3
    palsing's Avatar
    palsing Guest

    Default NGC 891 (Caldwell 23) in Andromeda

    While it may be the 23rd entry in Patrick Moore's Caldwell "list", the
    above designations are probably somewhat more appropriate for
    astronomical reference...

    ***********

    I other words, very few active amateurs ever refer to the Caldwell
    catalogue, a list certainly containing one or more objects never
    actually viewed by the author...

  4. #4
    wsnell01@hotmail.com's Avatar
    wsnell01@hotmail.com Guest

    Default NGC 891 (Caldwell 23) in Andromeda

    On Mar 23, 2:09 am, David Knisely <KA0...@navix.net> wrote:

    At least he refered to it as "NGC 891 (Caldwell 23)" instead of
    "Caldwell 23 (NGC 891)" as I saw on another Website.



 

 

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