It carries a number of sensors to investigate the environment of space, and its own status. It also contains a voice transmitter, intended to play back messages to amateur radio operators.[3]
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).
