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Corrective Optics Space Telescope Axial Replacement

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COSTAR being inserted into Hubble during First Servicing Mission.
Astronauts work on installing Hubble's corrective optics during Servicing Mission 1.

The Corrective Optics Space Telescope Axial Replacement (COSTAR) is the instrument designed to correct Hubble Space Telescope’s spherical aberration for light focused at the FOC, FOS and GHRS instruments. Built by Ball Aerospace Corp., it replaced the High Speed Photometer (HSP) during the first Hubble Servicing Mission in 1993. Later instruments, installed after HST's initial deployment, were designed with their own corrective optics.

It will be removed from HST during the fifth servicing mission, due to be launched in October 2008, when it will be replaced by the Cosmic Origins Spectrograph.

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