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UCAC4 and Cartes du Ciel


teleskopjo

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Good afternoon

Would like to ask whether it'd be possible to download only the positional data for a UCAC4 installation in Cartes du Ciel.

Ie. I do not need to have all the proper motion data or photometric filters other than from V band.

That should reduce the size of it I hope.

thanks!

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Thanks - I notice the CdC versions are extractions in themselves of the general UCAC4.

quote

ucac4-catalog-v2-south.zip : South zone -90 to -30

ucac4-catalog-v2-equator.zip : Equatorial zone -30 to +22.5

ucac4-catalog-v2-north.zip : North zone +22.5 to +90

A fourth file ucac4-index-v2.zip contain the optional search index for all the zones.

3 questions:

- what is the use of the search index? Is it only to enable CdC find a star given its UCAC name (ex. UCAC4-303-223417) ?

- say I want to have stars from +22.5 to +50, is there any possibility of identifying and deleting the +50 to +90 files after downloading the north catalog?

- is it possible to eliminate the fainter stars, say I want only a limit of mag. 14.  I know you can turn this up in CdC itself but my aim is to reduce the downloaded file size.

 

thanks!

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Sorry for the delay in replying. I'm traveling with limited internet access.

1 Yes. CdC uses this to locate a search and show the star.

2. I'd say yes, after download you can identify and remove nominated zones.

3 Not that I know. The usual method is to adjust the CdC settings.

HTH

 

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