I compiled the code found at http://www.astrometry.net/use.html on my Fedora 11 box (a VM really, hosted by VPSLink) in Boston. A couple edits to a couple makefiles, a bunch of yum installs for devel RPMs and I was off.
I fed it a test that it came with, and voila:
[root@galaxy demo]# /usr/local/astrometry/bin/solve-field --overwrite apod4.jpg Reading input file 1 of 1: "apod4.jpg"... jpegtopnm: WRITING PPM FILE Read file stdin: 719 x 507 pixels x 1 color(s); maxval 255 Using 8-bit output Extracting sources... simplexy: found 1467 sources. Solving... Reading file "./apod4.axy"... Field 1 did not solve (index index-219.fits, field objects 1-10). Field 1 did not solve (index index-218.fits, field objects 1-10). Field 1 did not solve (index index-217.fits, field objects 1-10). Field 1 did not solve (index index-216.fits, field objects 1-10). Field 1 did not solve (index index-215.fits, field objects 1-10). Field 1 did not solve (index index-214.fits, field objects 1-10). Field 1 did not solve (index index-213.fits, field objects 1-10). Field 1 did not solve (index index-212.fits, field objects 1-10). Field 1 did not solve (index index-211.fits, field objects 1-10). Field 1 did not solve (index index-210.fits, field objects 1-10). Field 1 did not solve (index index-209.fits, field objects 1-10). Field 1 did not solve (index index-208.fits, field objects 1-10). Field 1 did not solve (index index-207.fits, field objects 1-10). Field 1 did not solve (index index-206.fits, field objects 1-10). Field 1 did not solve (index index-205.fits, field objects 1-10). Field 1 did not solve (index index-219.fits, field objects 11-20). log-odds ratio 102.203 (2.43256e+44), 24 match, 1 conflict, 104 distractors, 33 index. RA,Dec = (187.099,56.6898), pixel scale 170.367 arcsec/pix. Hit/miss: ++-++-+-+-+++---+-++++-+-----------++-------+--+----------+-----------------+------c ----------+- Field 1: solved with index index-218.fits. Field 1 solved: writing to file ./apod4.solved to indicate this. Field: apod4.jpg Field center: (RA,Dec) = (187.2, 56.72) deg. Field center: (RA H:M:S, Dec D:M:S) = (12:28:44.881, +56:42:55.986). Field size: 33.1393 x 23.7307 degrees Creating new FITS file "./apod4.new"... Creating index object overlay plot... Creating annotation plot... Your field contains: Part of the constellation Draco (Dra) Part of the constellation Ursa Major (UMa)
How cool is that? It also writes out a FITS file, and some PNGs which show the constellations in there, or any other object.