Chandra X-Ray Observatory
Last modified: 7 September 2018


There are a number of coordinate systems used in the Chandra data products. For the positions of events, one may encounter several different coordinate systems: (RA, Dec), (x,y), (detx, dety), (tg_r, tg_d), etc.

For a complete description of the Chandra coordinate systems, please view the Paper on Chandra Coordinate Systems. You may also find the Coordinate Definitions section of the Using SAOImage ds9 useful.

Last modified: 7 September 2018
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