Zon Mosaic Pro5 User's Guide Page 83

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Object Databases 83
Hubble/Chandra/Spitzer Images: These
databases contain about 100 images taken
by space telescopes. A full description for
each image is provided in the Night Sky
Tours section of SkyGuide.
See“SkyGuide
” on page 68 to learn more
about exploring SkyGuide.
Quasars: More than 18 000 quasars, BL
Lac objects, and active galaxies. All three
classes of objects are the extremely
luminous nuclei of very distant galaxies.
There is probably a supermassive black
hole at the center of each of these objects.
This database was created by Ulf Teras.
User Images: This is a database of images
which you have added to Starry Night
yourself. Initially, this database will be
blank. See “User Images
” on page 171 to
learn how to add your own images.
Galaxies: The PGC (Principal Galaxy
catalogue). This database contains 980 000
galaxies brighter than magnitude 18, far
more than the NGC-IC database.
Nebula: Some 2700 nebulae. This
database includes outlines for Dark,
Emission and Reflection nebulae.
Databases 4 (Other)
Certain databases are not included in any
of the above layers, and are listed
separately in the Other category of the
Options pane. Most databases fall into this
category because they overlap with one or
more of the databases described in the first
4 layers. For example, the Other category
includes a database of planetary nebulae.
However, many of these nebulae are
already included in the “Messier Objects”,
or the “Bright NGC Objects” databases, so
Starry Night would show duplicate
markings for these objects, if the
“planetary nebulae” database was also
turned on. By default, all of the databases
in the Other category are turned off, but
you can turn one or more of these
databases on if it suits your purpose.
Tip: Most of the databases in this category
were created by Starry Night users. See
Adding Objects 4 (Databases)
” on
page 170 for information on building your
own databases.
Note: The list of databases in your version
of Starry Night may not be exactly the
same as the following list, as we are
continually adding new databases and
updating existing ones. If you like to
include a database you see described here,
but it is not installed in your version of
Starry Night, please visit the Knowledge
Base area of our web site and do a search
for “databases”.
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