Environmental Research Satellite
family of artificial satellites launched in the 1960s run by the USAF
The Environmental Research Satellite (ERS, alternatively Earth Resources Satellite) program was a series of small satellites initially operated by the United States Air Force Office of Aerospace Research. Designed to be launched "piggyback" to other satellites during launch, detaching once in orbit, they were the smallest satellites launched to date—what would today be classified as microsatellites. Thirty-three ERS satellites in six different series were launched between 1962 and 1971, conducting scientific research and serving as test beds to investigate the reliability of new spacecraft components.
Summary of launches
TRS Mk. 1
The TRS (Tetrahedral Research Satellite) Mk. 1 was developed by Space Technology Laboratories, a subdivision of TRW Inc., as an inexpensive, miniaturized "off-the-shelf" satellite that customers could use to perform simple experiments in orbit. The Mk. 1 was a regular tetrahedron measuring 16 cm (6.3 in) on a side, each face mounted with sufficient solar cells to operate the experiments and the telemetry system when the satellite was in the sun. Transmission of data was constant at that time as the spacecraft included neither internal battery nor command system. A transistor-based system provided eight channels of data: five for experiments, two for telemetry calibration, and one for the spacecraft temperature.
The public source identifies “Environmental Research Satellite” as family of artificial satellites launched in the 1960s run by the USAF. This brief keeps that definition visible, then builds a research path around Environmental, Research and Satellite.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 7, 2026. The linked authority identifier is Q5816628. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1962 and 1971.
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This entry incorporates text from “Environmental Research Satellite” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.