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# PS1 Photometric Reference Ladder, Release 12.01

(up to [PS1 Data Release](@WWWHOST@/index.php))

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:

> Magnier E.A., Schlafly E., Finkbeiner D., Juric M., Tonry J.L., Burgett W.S., Chambers K.C., Flewelling H.A.,
Kaiser N., Kudritzki R.-P., Morgan J.S., Price P.A., Sweeney W.E., Stubbs C.W., 2013 ApJS in press.

A PDF of the article preprint is linked below:

* [Magnier et al, 2012 : Photometric Reference Ladder, Release 12.01 Paper (pdf)](@WWWHOST@/docs/photladder-1206.20130301.pdf)

**Please include the following acknowledgement text in any publications
which make use of data from Pan-STARRS 1:**

> The Pan-STARRS1 (PS1) Surveys have been made possible through
contributions of the Institute for Astronomy, the University of
Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its
participating institutes, the Max Planck Institute for Astronomy,
Heidelberg and the Max Planck Institute for Extraterrestrial Physics,
Garching, The Johns Hopkins University, Durham University, the
University of Edinburgh, Queen's University Belfast, the
Harvard-Smithsonian Center for Astrophysics, the Las Cumbres
Observatory Global Telescope Network Incorporated, the National
Central University of Taiwan, the Space Telescope Science Institute,
the National Aeronautics and Space Administration under Grant
No. NNX08AR22G issued through the Planetary Science Division of the
NASA Science Mission Directorate and the University of Maryland.


@ Data Product             : none                       : plain : title : Comment
@ Ubercal FITS tables  : ubercal-fits : dir   : dir1  : FITS Table version, photometric data only
@ Ubercal CSV tables  : ubercal-csv : dir   : dir2  : CSV Table version, photometric data only
@ Relphot FITS tables  : relphot-fits : dir   : dir1  : FITS Table version, relative photometry calibration (caution!)
@ Relphot CSV tables  : relphot-csv : dir   : dir2  : CSV Table version, relative photometry calibration (caution!)
