STS-37

STS-37
Name	STS-37
Mission type	Satellite deployment and EVA
Operator	National Aeronautics and Space Administration
Mission duration	5 days, 5 hours, 30 minutes, 4 seconds
Launch date	April 5, 1991
Launch site	Kennedy Space Center
Landing date	April 10, 1991
Landing site	Edwards Air Force Base
Spacecraft	Atlantis

STS-37. STS-37 was a Space Shuttle mission conducted by National Aeronautics and Space Administration using the orbiter Atlantis that launched from Kennedy Space Center on April 5, 1991, and landed at Edwards Air Force Base on April 10, 1991. The flight deployed the Compton Gamma Ray Observatory and included two extravehicular activity periods to resolve deployment anomalies, involving crew members with experience from programs associated with Rockwell International, Martin Marietta, Hughes Aircraft Company, and Marshall Space Flight Center. The mission contributed to gamma-ray astronomy, spacecraft operations, and later developments in Hubble Space Telescope servicing and Space Shuttle program procedures.

Mission overview

STS-37 carried a primary objective to deploy a major astrophysics observatory, the Compton Gamma Ray Observatory, built by a consortium led by NASA Goddard Space Flight Center and Aerospace Corporation partners, following earlier launches such as STS-26 and contemporaneous with missions like STS-35. The mission demonstrated in-orbit operations involving the Remote Manipulator System operated by crew trained at Johnson Space Center and coordination with mission control personnel from Marshall Space Flight Center and Goddard Space Flight Center. The flight profile included two planned spacewalks for equipment checkout tasks and to address anomalies encountered during deployment, under procedures influenced by lessons from Challenger disaster recovery and Return to Flight safety protocols. The mission reinforced collaboration between contractors such as TRW Inc., Perkin-Elmer, and Ball Aerospace in deploying flagship science payloads.

Crew

The five-member crew combined NASA veterans and mission specialists with backgrounds linking to institutions such as Naval Postgraduate School, Air Force Test Pilot School, United States Naval Academy, United States Air Force, and United States Navy. The commander had prior assignments with Orbital Flight Test activities and coordination with Mission Control Center teams. The pilot brought flight test experience connected to Dryden Flight Research Center while the mission specialists contributed expertise in astronaut training programs at Johnson Space Center, instrumentation from Los Alamos National Laboratory, and astrophysics from Caltech and Massachusetts Institute of Technology. Flight crew support and payload specialists liaised with engineers from Lockheed Martin, General Electric, and academic partners including University of California, Berkeley.

Payload and experiments

The primary payload, the Compton Gamma Ray Observatory, represented one of the "Great Observatories" alongside Hubble Space Telescope, Chandra X-ray Observatory, and Spitzer Space Telescope concepts; it housed instruments developed by teams from California Institute of Technology, Massachusetts Institute of Technology, Princeton University, Stanford University, University of Chicago, Columbia University, Yale University, University of Maryland, University of California, Santa Cruz, and Harvard University. Scientific instruments included detectors devised by Los Alamos National Laboratory, Lawrence Livermore National Laboratory, and Goddard Space Flight Center collaborators to observe gamma-ray bursts, pulsars, and active galactic nuclei studied by researchers associated with Johns Hopkins University, Pennsylvania State University, and University of Michigan. Secondary experiments aboard Atlantis involved life sciences investigations run by teams from International Space University-linked researchers and engineering payloads from Sandia National Laboratories and Jet Propulsion Laboratory.

Timeline and major events

Launch occurred from Kennedy Space Center on April 5, 1991, following launch processing at facilities supported by Rockwell International and United Space Alliance contractors. After reaching orbit, crew operations included activation of the Remote Manipulator System and checkout of the observatory prior to planned release. During deployment, the observatory's high-gain antenna and deployment mechanisms, involving hardware from TRW Inc. and Hughes Aircraft Company, exhibited anomalies that required unscheduled extravehicular activity operations by mission specialists. The crew conducted two EVAs to resolve issues, employing tools and procedures validated at Johnson Space Center neutral buoyancy facilities and rehearsed with staff from Marshall Space Flight Center and Goddard Space Flight Center. Following successful resolution, the observatory was placed into a nominal orbit and began commissioning activities coordinated with ground teams at Compton Ground Station affiliates and principal investigators at participating institutions.

Anomalies and contingency operations

During deployment of the Compton observatory, the mission encountered a deployment failure involving a latching mechanism and communications antenna, attributable to mechanical interference and requiring astronaut intervention; contingency procedures were executed under guidance from Mission Control Center engineers at Johnson Space Center and flight directors with backgrounds associated with Kenneth D. Bowersox-era operations and protocol development post-Challenger disaster. The unscheduled EVAs relied on contingency toolkits developed by contractors including Lockheed Martin and McDonnell Douglas specialists and required coordinated real-time troubleshooting with instrument teams from Goddard Space Flight Center, Ball Aerospace, and university partners. These operations informed revisions to on-orbit repair checklists and influenced later servicing strategies used during Hubble Space Telescope missions and observatory recovery scenarios.

Mission aftermath and legacy

Following successful deployment and resolution of anomalies, the Compton Gamma Ray Observatory entered a productive science phase that led to discoveries by astrophysicists at institutions such as CALTECH, Massachusetts Institute of Technology, University of Maryland, Princeton University, and Stanford University related to gamma-ray bursts and blazar variability; these results were published in collaboration with teams from NASA Goddard Space Flight Center and national laboratories. Operational lessons from the EVAs and contingency responses influenced Space Shuttle program procedures, contributed to astronaut training protocols at Johnson Space Center, and affected payload integration standards adopted by contractors like Rockwell International and TRW Inc.. The mission's experience in on-orbit problem solving became part of institutional knowledge used in later missions including STS-61 servicing of the Hubble Space Telescope and informed designs for successor observatories developed by NASA and international partners such as European Space Agency, Japanese Aerospace Exploration Agency, and Canadian Space Agency.

Category:NASA missions Category:Space Shuttle missions Category:1991 in spaceflight