During the last week Chandra completed the observing schedule as planned.

Real-time procedures were executed on Apr 23, 24, 25 and 27 to turn off the on-board ranging drive function during communications contacts with the Deep-Space Network ground station DSS-54. This action is taken to collect additional characterization data on this station's performance, in order to understand the cause for regular instances of dropped telemetry frames when using this station

A Chandra press release was issued on Apr 28 describing how researchers are using a large sample of galaxy cluster to investigate dark energy. The details of X-ray emission from over 300 galaxy clusters were obtained with Chandra. The galaxy clusters range in distance from about 760 million to 8.7 billion light years from Earth. The study shows that dark energy has not changed over billions of years. For details see: http://chandra.si.edu/press/16_releases/press_042816.html

The schedule of targets for the next week is shown below