Diagram Space telescope Kepler of NASA   showing integrated Photometer and Spacecraft
NASA
2009-01-01
<a rel="nofollow" class="external free" href="https://keplerscience.arc.nasa.gov/data/documentation/KSCI-19033-001.pdf">https://keplerscience.arc.nasa.gov/data/documentation/KSCI-19033-001.pdf</a>