SDO Day 52: Instrument Jitter and Guide Telescopes
Today the instruments examined how they affect the pointing of SDO. Filters and shutters inside the instruments have to rotate into new positions before each exposure, so SDO has a lot things spinning around. Each instrument ran their filters wheels and shutters to see how SDO moved. After that they tested the guide telescopes that are part of AIA. The "Science Reference Boresight" is determined by these guide telescopes, so understanding their behavior is crucial to SDO.