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Is the UCAC3 catalogue useful????


MikePaling

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Hi ....

I have been using the GSC11 catalogue very successfully in conjunction with Sequence for a while now .... but have been intrigued about some of the other options possible in the Sequence set-up area.

 

This particular catalogue has been very difficult to track down on the Internet ..... but I have just noticed that the UCAC3 catalogue is now available to download on the ASA web site .... I can see that it is a very big set of files.

 

Are there any benefits of using the UCAC3 cat instead of the GSC11 cat???

When & where should I consider using it???

 

Will it just clog up my observatory laptop unnecessarily? I do have a lot of disc space left though !

 

Regards Mike

 

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Hi Mike,

 

ASA described it in Sequence manual:

1. Select the right reference catalogue here. In 90% of all cases, the new GSC1.1 is the right

choice. Select the UCAC3 for telescopes with small fields.
 
2. and also in the MLPT Manual
Field of larger than 20 arc minutes can use the GSC. If you have small fields you can either use the
UCAC3 or the USNOA.
 
BR
Thomas
Edited by tbaehnck
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