General description: Recalculated proper motions using the methods of Munn et al. 2004, AJ, 127, 5, 3034-3042. Munn et al. recalibrate USNO-B positions using SDSS galaxies, and recompute proper motions including both the USNO-B and SDSS positions. Statistical errors in the USNO-B proper motions are decreased by roughly 20%-30%, systematic errors are greatly reduced, and the proper motions are placed on an absolute reference frame. Requiring a match to an SDSS object removes the large number of false high proper motion objects in USNO-B. The resultant catalog is 90% complete to g < 19.7, with statistical errors in the component proper motions of roughly 3-3.5 mas/yr, substantially smaller systematic errors, and a contamination rate of less than 0.5%. Identification information for the SDSS source is given. This file is a roll-up of a full camcol; see the individual field files for full description.
Naming convention: photoPM-RUN6-FIELD4.fits
Approximate size: 20 kbytes.
File type: FITS
Read by products: sas
Written by products: photoop