(1997) STS-82 Discovery Launch - Second Hubble Space Telescope (HST) servicing.
The STS-82 mission was the second in a series of planned servicing missions to the orbiting Hubble Space Telescope (HST). HST was placed in orbit on April 24, 1990 by the Space Shuttle Discovery on STS-31.
Starting on the third day of the mission, the seven-member crew were to conduct four spacewalks to remove two older instruments and install two new astronomy instruments, as well as other servicing tasks. The two older instruments being replaced are the Goddard High Resolution Spectrometer and the Faint Object Spectrograph. Replacing these instruments are the Space Telescope Imaging Spectrograph (STIS) and the Near Infrared Camera and Multi-Object Spectrometer (NICMOS).
The Shuttle Radar Topography Mission (SRTM) is an international project spearheaded by the National Imagery and Mapping Agency and NASA, with participation of the German Aerospace Center DLR. Its objective was to obtain the most complete high-resolution digital topographic database of the Earth.