\<COLOUR 1> COMMENTS: \<COLOUR 0> Sixth in the Westar series of US domestic comsats; destined for geostationary orbit, it is marooned in useless low orbit when PAM booster fails after launch from Challenger (STS-41B); later recovered from orbit by Discovery astronauts on STS-51A; refurbished and relaunched into geostationary orbit by Chinese Long March 3 as Asiasat 1 on April 7, 1990.