Battery failure in July 1984 caused the operation to become limited, and continuing problems lead to the termination of X-ray observation in 1985. It reentered the atmosphere on January 19, 1989 (other sources, for example the NORAD catalog of satellites, say decay date (the day it stopped working) was 17 May 1988[1]).
Launches are separated by dots ( • ), payloads by commas (, ), multiple names for the same satellite by slashes ( / ). Crewed flightsare underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).
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