The Southern Proper Motion Program. I - Magnitude equation correction

Details The Southern Proper Motion Program. I - Magnitude equation correction The Southern Proper Motion Program. I - Magnitude equation correction

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..855g&link_type=abstract

Astronomical Journal, vol. 11, p. 855

Astronomy and Astrophysics

Astronomy

30

Astrometry, Photographic Plates, Astronomical Catalogs, Calibrating, Faint Objects

Scientific paper

As with virtually all photographic plate material, the astrograph plates from which the Southern Proper Motion (SPM) catalog is being compiled suffer from magnitude-dependent systematic shifts in the image positions, i.e., a magnitude equation. If left uncorrected, these would adversely affect both the primary goals of the SPM catalog, the absolute proper motions, and the faint secondary reference frame. Using the diffraction-grating images present on the plates, a procedure is adopted that allows a spatially variant magnitude equation correction to be derived individually for each SPM plate. Application of the method to 120 SPM fields, primarily around the south Galactic pole and the -30 deg and -35 deg declination zones, demonstrates its effectiveness. Indeed, the method proves superior, in the case of the SPM, to a direct calibration of the magnitude equation using the newly available Tycho Catalog. The result of the diffraction-grating technique is final SPM positions and proper motions that are largely magnitude equation free, as verified by numerous internal and external checks.

Affiliated with

Also associated with

No associations

Rating

The Southern Proper Motion Program. I - Magnitude equation correction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Southern Proper Motion Program. I - Magnitude equation correction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Southern Proper Motion Program. I - Magnitude equation correction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1222902