Astronomers Release Most Detailed Catalogue Ever Made of the Visible Milky Way. The production of the catalogue, IPHAS DR2 (the second release from the survey programme The INT Photometric H-alpha Survey of the Northern Galactic Plane or IPHAS), is an example of modern astronomy's exploitation of 'big data' – it contains information on the 219 million detected objects, each of which is summarised in 99 attributes. With this catalogue release, the team are offering the world community free access to measurements taken through two broad band filters capturing light at the red end of the
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