Andrew Hood Oct 7 5:43 PM
There are lbn and ldn folders under nebulae. Guide uses these catalogs in FITS format which aren't human readable. If you have a copy of "fv" you can read them. http://heasarc.gsfc.nasa.gov/ftools/fv/
I can verify that problem, Pierre. The original Lynd’s Catalog from 1962 shows LDN 2 at coordinates RA 18 4 Dec -31 30 which, once converted to epoch 2000 coordinates, gives RA 18h 07m 14.6s, Dec -31° 29m 35s, almost exactly what you got when plate-solving your image.
This is indeed where Guide shows LDN 4, which has the size of LDN 2 (1.24 sq. deg) listed for it as well. Guide shows nothing at all in the spot where LDN 4 should be according to the epoch-corrected coordinates from the Lynd catalog (RA 17h 2m 30.1s Dec -22° 12m 15.2s)
I searched through the Guide folders and subfolders doing various text searches and cannot find where the LDN data is either.
-- There's no point in being grown up if you can't be childish sometimes. -- Dr. Who