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

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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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...

On Mar 23, 2:09 am, David Knisely wrote:
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.

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