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TheGoddard High Resolution Spectrograph (GHRS or HRS) was an ultravioletspectrograph installed on theHubble Space Telescope during its original construction, and it was launched into space as part of that space telescope aboard theSpace ShuttleDiscovery on April 24, 1990 (STS-31).[1] The instrument is named after 20th century rocket pioneerRobert H. Goddard.[2]
One of the results was the discovery of tenuous atmosphere for Jupiter's moonEuropa in 1995.[3] The gas was determined to be mostly ofmolecular oxygen (O2).[3][4] The surface pressure of Europa's atmosphere is 0.1 μPa, or 10−12 times that of the Earth.[5]
An example GHRS use was to observe the localinterstellar medium in the direction towardsCapella.[6]
The Goddard High Resolution Spectrograph was removed from the Hubble Space Telescope during the February, 1997, Space ShuttleDiscovery missionSTS-82 (also called SM-2 for Servicing Mission 2). It, and theFaint Object Spectrograph,[7] were replaced by two new instruments installed during the mission,[8] theNear Infrared Camera and Multi-Object Spectrometer (NICMOS) and theSpace Telescope Imaging Spectrograph.[9][7]
A technical description of the construction and operation of the GHRS can be found in the GHRS instrument handbook.[10]
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