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Nimbus was a research program conducted by NASA in the 1960s and 1970s to study the Earth's atmosphere and weather via satellites in polar orbit. This artifact SIRS-B (Satellite Infrared Spectrometer) was a key research instrument, called a sounder, used to measure temperature and water vapor at different levels in the atmosphere.

A SIRS-B sounder flew on Nimbus 4, launched in 1970. It provided daily measurements of temperature and moisture, which then were used to develop computer models of the dynamics of the Earth's atmosphere.

This artifact is a flight spare and was transferred to the Museum by the National Oceanic and Atmospheric Administration in 1987.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin United States of America Type SPACECRAFT-Uncrewed-Instruments & Payloads Manufacturer Santa Barbara Research Center
 Dimensions Overall: 54.61 x 38.1cm (1ft 9 1/2in. x 1ft 3in.)
 Materials Aluminum, Gold Plating, Rubber (Silicone), Steel, Plastic, Acrylic (Plexiglas), Copper, Paint, Glass
 Inventory Number A19870196000 Credit Line Transferred from NOAA Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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