An additional photomultiplier system viewed a beam splitter in the optical path and was used as a star mapper--to monitor and determine the satellite attitude, and in the process to gather photometric and astrometric data of all stars down to about 11th magnitude.
Its purpose was to monitor and determine the satellite attitude, and in the process, to gather photometric and astrometric data of all stars down to about 11th magnitude. An additional photomultiplier system viewed a beam splitter in the optical path and was used as a star mapper.
An additional photomultiplier system viewed a beam splitter in the optical path and was used as a star mapper. Its purpose was to monitor and determine the satellite attitude, and in the process, to gather photometric and astrometric data of all stars down to about 11th magnitude.
An additional photomultiplier system viewed a beam splitter in the optical path and was used as a star mapper. Its purpose was to monitor and determine the satellite attitude, and in the process, to gather photometric and astrometric data of all stars down to about 11th magnitude.