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sponsored by psychohistorian.org
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1 Exact identifier
NGC
Messier
IC
Bennett
Non-NGC/IC
Caldwell
How to access the information in the database:
If you're looking for info on a specific object, and you know its exact identifier (for example, 'PN G294.1+43.6' or 'Cl Stephenson 2'), type that in one of the boxes on the right (in section 1 ) and hit "goto". For objects in the Messier, Bennett and Caldwell lists, a handy drop-down selection is provided.
Alternatively (section 2 below), you can specify up to two phrases to find partial matches (for example, 'PN H' and 'IC', lists all Hubble planetaries also in the IC).
To find all objects based on their RA and Dec, either use 3 (to search around a point) or 4 (to find everything within a block of sky).
To find objects by constellation, see section 5 . To list objects appearing on the pages of certain star atlases, try 6 .
If you have no idea what you're looking for, section 7 will allow you to explore the sky visible during your current observing session. Note that you have to be logged in to use this feature (computers aren't that good yet).
Finally, you could try section 8 and search for up to two phrases in the text descriptions (for example, 'amazing', or 'naked' and 'broad'). This could take a long time, so be patient.
2 Search by identifier
Find objects by various designations.
3 Search around a co-ordinate
Find all objects within a certain radius from a point in the sky.
4 Search by co-ordinate block
Find all objects within a block of sky, bound by co-ordinates:
5 Search by constellation
Find all objects within the selected constellations:
6 Look up objects by star chart number
Millenium Star Atlas (MSA)
Uranometria 2000.0
7 What's up?
Explore the sky by finding everything above a certain altitude
8 Full text search
Search (slowly!) through the text descriptions and comments.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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