Template:Infobox spaceflight

Thor Agena B with Discoverer 19 (Dec. 20, 1960)

The launch of Discoverer 19

Discoverer 19, also known as RM-1, was an American satellite which was launched in 1960. It was a technology demonstration spacecraft, based on an Agena-B.[1]

The launch of Discoverer 19 occurred at 20:32 UTC on 20 December 1960. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-3-5 at the Vandenberg Air Force Base.[2] Upon successfully reaching orbit, it was assigned the Harvard designation 1960 Tau 1.

Discoverer 19 was operated in a low Earth orbit, with a perigee of 206 kilometres (Template:Convert/round mi), an apogee of 578 kilometres (Template:Convert/round mi), 83.4 degrees of inclination, and a period of 92.4 minutes.[3] The satellite had a mass of 1,060 kilograms (Template:Convert/round lb),[4] and was used to demonstrate technology for the Midas programme,[5] including infrared sensors.[4] It remained in orbit until 23 January 1961,[3] when it decayed and reentered the atmosphere.


  1. Krebs, Gunter. "RM 1, 2 (Discoverer 19, 21)". Gunter's Space Page. Retrieved 30 June 2010. 
  2. McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 30 June 2010. 
  3. 3.0 3.1 McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 30 June 2010. 
  4. 4.0 4.1 Wade, Mark. "Midas". Encyclopedia Astronautica. Retrieved 30 June 2010. 
  5. "Discoverer 19". NSSDC Master Catalog. NASA. Retrieved 30 June 2010. 
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