The High Speed Photometer (HSP) was a scientific instrument installed on the Hubble Space Telescope. The HSP was designed to measure the brightness and polarity of rapidly varying celestial objects. It could observe in ultraviolet, visible light, and near infrared at a rate of one measurement per 10 microseconds (10e-5 seconds). The design was novel in that despite being able to view through a variety of filters and apertures, it had no moving parts.
The HSP was one of the instruments on Hubble at launch but couldn't be used successfully due to the optical problems with the telescope. During the first servicing mission, in December 1993, it was replaced by the Corrective Optics Space Telescope Axial Replacement (COSTAR), which corrected the optical problem for the remaining instruments.
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