The second data release of the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS DR2)

The INT/WFC Photometric H Survey of the Northern Galactic Plane (IPHAS) is a 1800 deg 2 imaging survey covering Galactic latitudes |b| < 5 and longitudes = 30 -215 in the r, i, and H filters using the Wide Field Camera (WFC) on the 2.5-m Isaac Newton Telescope (INT) in La Palma.We present the first quality-controlled and globally calibrated source catalogue derived from the survey, providing single-epoch photometry for 219 million unique sources across 92 per cent of the footprint.The observations were carried out between 2003 and 2012 at a median seeing of 1.1 arcsec (sampled at 0.33 arcsec pixel -1 ) and to a mean 5 depth of 21.2 (r), 20.0 (i), and 20.3 (H) in the Vega magnitude system.We explain the data reduction and quality control procedures, describe and test the global re-calibration, and detail the construction of the new catalogue.We show that the new calibration is accurate to 0.03 mag (root mean square) and recommend a series of quality criteria to select accurate data from the catalogue.Finally, we demonstrate the ability of the catalogue's unique (r -H, ri) diagram to (i) characterize stellar populations and extinction regimes towards different Galactic sightlines and (ii) select and quantify H emission-line objects.IPHAS is the first survey to offer comprehensive CCD photometry of point sources across the Galactic plane at visible wavelengths, providing the much-needed counterpart to recent infrared surveys.