XMM-Newton Science Analysis System
catcorr (catcorr-0.11.2) [xmmsas_20230412_1735-21.0.0]
- SDSS: the Sloan Digital Sky survey data release 8 - positions extracted from the
photoPrimary table to a set
of text files at Leicester using SQL scripts. This has the deepest sky coverage
but only about one third of the sky is covered. When the XMM field is covered
by SDSS, its goodness of fit value is almost always the largest.
- 2MASS: the Two Micron All Sky Survey, conducted by CalTech using telescopes
in Arizona and Chile. The catalogue covers the entire sky, and contains about
600 million objects with a typical positional accuracy of 0.5 arc-seconds.
The main value of 2MASS in this context is at very low galactic latitudes.
- USNO-B1: the US Naval Observatory catalog contains just over one billion objects
from measurements of Schmidt plates taken at various observatories over the
past 50 years. It covers the entire sky.
XMM-Newton SOC -- 2023-04-16
