about Astrometry.net index

[yian...@gmail.com]

Hi, I installed the Astrometry.net index files via the command line on Debian using:

sudo apt-get install astrometry-data-tycho2

The installed index files on Debian are named as:
index-tycho2-07.littleendian.fits  

index-tycho2-12.littleendian.fits  

index-tycho2-17.littleendian.fits  
index-tycho2-08.littleendian.fits  

index-tycho2-13.littleendian.fits  

index-tycho2-18.littleendian.fits  
index-tycho2-09.littleendian.fits  

index-tycho2-14.littleendian.fits  

index-tycho2-19.littleendian.fits  
index-tycho2-10.littleendian.fits  

index-tycho2-15.littleendian.fits  
index-tycho2-11.littleendian.fits  

index-tycho2-16.littleendian.fits

I want to know which indices from https://data.astrometry.net these files correspond to.
Is it possible to correspond to 4100 series
Debian file (index-tycho2-XX.littleendian.fits) → index-41XX.fits

So when my device FOV is determined, can I specify an index to speed up parsing without having to traverse all index files

[Dustin Lang]

Hi,

I don't know, but that is a good guess - the 4100-series are the only recent ones built from Tycho-2.

There is not an easy way to tell solve-field to only read some index files.  You could create a custom astrometry.cfg file and list on the index files you want to load.  Only the headers of the files are read to decide if they should be used, and should get cached at the filesystem level by your OS, so for this index set it really shouldn't be an issue.

cheers,

dustin

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