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   The NSV (New Catalog of Suspected Variables) is mostly of interest to
variable star observers.  It lists over 14,000 stars that someone has
thought might be a variable,  but which haven't been studied well enough to
be sure of the matter.
                                                        
   Double stars are designated by double star catalog and number, for
instance ADS (Aitken Double Star) or Struve number.  When you select the
"Double Star" option,  a list of over 130 double star catalogs (all named
after their discoverers) is shown.

   The "Supernova" option looks for supernovae that have occurred in
other galaxies. Over 1000 have been observed; the first was in our
neighboring galaxy, M-31 in Andromeda. Apart from that supernova and
one in the Large Magellanic Cloud in 1987, no supernova outside our
galaxy has been bright enough to be visible to the unaided eye.
Supernovae are designated by a year and a letter (e.g. 1993J or 1885A).
                                                  
   The "Durchmusterung" option provides a way to find stars in the
four catalogs of the DM Catalog.  These are known as the Bonner
Durchmusterung (BD),  which covers stars in the northern half of the
sky;  the Sudentliche Durchmusterung (SD),  which covers stars between
declinations -1 and -23 degrees;  the Cordoba Durchmusterung (CD),
which covers declinations -22 to -90;  and the Cape Photographic
Durchmusterung (CP),  which covers -18 to -90.  You'll notice that
these catalogs overlap in places.

   The designation consists of the catalog abbreviation (BD, SD, CD,
and CP), followed by the zone number,  followed by the star number.
For example:

BD +32 724
CP -67 1233
                                                    
   In the "Hipparcos" option enter an Hipparcos catalog number to recenter
on that object.

5b:  Finding galaxies            

  The "Galaxy" option in the "Go to" menu provides ways to find both
galaxies and clusters of galaxies. The menu appears as:

PGC
Uppsala
MCG
ESO/Uppsala
CGCG
Markarian
Abell Cluster
Zwicky Cluster
Common Name
Hickson

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