PS1 Photometric Reference Ladder, Release 12.01
(up to PS1 Data Release)
The PS1 Photometric Reference Ladder (Release 12.01) provides reference PS1 photometry for 1-degree wide bands across the sky. There are 24 rungs in RA (1 at each integer RA hour) and 4 rungs in DEC (at -25, 0, +25, and +50 degrees). In each band, a maximum of ~1000 objects per square degree are provided.
The reference catalog data are provided in 2 formats: FITS tables and Comma-Separated Values text files. The latter may be easily loaded into excel or certain database software.
There are two sets of tables: ubercal and relphot. The ubercal tables only include objects for which measurements in all 5 filters were used for the ubercal solution. These data come from time periods which have been judged as photometric and reprensent the most pristine sample.
The relphot tables include objects for which some (or even all) of the filters have been calibrated via relative photometry using image overlaps to connect them to images in the ubercal set. Please take care when using the relphot tables, as the relative photometry tie may allow for substantial drift in certain patches in the sky (see Figure 6 in Magnier et al 2013).
The publication describing the photometric ladder has been accepted for publication in The Astrophysical Journal Supplement and should be reference as:
A PDF of the article preprint is linked below:
Please include the following acknowledgement text in any publications which make use of data from Pan-STARRS 1: