\<COLOUR 1> SIZE: \<COLOUR 0> Box-shaped, 7.7 metres by 5 metres by 4.6 metres; solar array span 23.8 metres
\<COLOUR 1> WEIGHT: \<COLOUR 0> 15.6 tonnes
\<COLOUR 1> COUNTRY: \<COLOUR 0> USA
\<COLOUR 1> COMMENTS: \<COLOUR 0> Compton, originally called the gamma-ray observatory, monitors the sky at gamma-ray wavelengths, looking particularly for the mysterious gamma-ray bursts; unscheduled EVA by Jerry Ross and Jay Apt needed to free the high-gain antenna on the satellite, which initially failed to deploy.