Chandra is a NASA mission launched on 23rd July 1999 in an elliptical orbit that allows observations of a source for up to 55 hours. There are 4 X-ray instruments on board and it observes in the 0.08-10.0 keV band with a sensitivity of ~4 x 10⁻¹⁵ erg cm⁻² s⁻¹ in just 10 ks.
It has excellent resolution of 0.5’’ in the centre of the field of view. The Advanced CCD Imaging Spectrometer (ACIS) can be used in a variety of configurations with a timing resolution from 2.85ms-3.2 s and a field of view from just a few pixels for bright sources (best time resolution) to 16.9 x 16.9’.
The High Resolution Camera (HRC) has almost no spectral resolution but a field of view up to 30 x 30’ and a timing resolution of 16 microseconds. The High Resolution Spectrometers operating in the 0.07- 0.15 keV band (LETGS) with a resolution of >1000 and the 0.4-10 keV band (HETGS) with a resolution of 65-1000.
The X-ray catalogue contains 1.3 million detections (~400000 sources) and for more information see https://cxc.harvard.edu/index.html