Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.

SMM (Solarmax)


SMM (Solar Maximum Mission) was a solar observatory, which featured 7 instruments for solar observation:

  • Gamma Ray Spectrometer (GRS)
  • Active Cavity Radiometer Irradiance Monitor (ACRIM)
  • Coronagraph Polarimeter (CP)
  • Hard X-Ray Burst Spectrometer (HXRBS)
  • Hard X-Ray Imaging Spectrometer (HXIS)
  • UV Spectrometer and Polarimeter (UVSP)
  • X-Ray Polychromator (XRP)

It was based on Fairchilds MMS bus, making it the first space craft designed for in space servicing.

In december 1980, the attitude control system failed due to a fuse failure. The satellite was repaired by astronauts of the 11th Shuttle mission, making it the first satellite to be repaired on orbit. It was originally planned to be returned to earth in 1990 by another space Shuttle to be refurbished as the EUVE satellite, but these plans were finally cancelled.

Nation: USA
Type / Application: Solar observatory
Operator: NASA
Contractors: Fairchild
Configuration: MMS
Power: 2 deployable solar arrays, batteries
Mass: 2268 kg
Orbit: 566 km × 569 km, 28.5
Satellite COSPAR Date LS Launch Vehicle Remarks
SMM (Solarmax) 1980-014A 14.02.1980 CC LC-17A Delta-3910