|Operator||US Air Force/ARPA|
|Harvard designation||1960 Tau 1|
|Launch mass||1,060 kilograms (2,340 lb)|
|Start of mission|
|Launch date||20 December 1960, 20:32UTC|
|Rocket||Thor DM-21 Agena-B 258|
|Launch site||Vandenberg LC-75-3-5|
|End of mission|
|Decay date||23 January 1961|
|Perigee altitude||206 kilometers (128 mi)|
|Apogee altitude||578 kilometers (359 mi)|
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. 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 (128 mi), an apogee of 578 kilometres (359 mi), 83.4 degrees of inclination, and a period of 92.4 minutes. The satellite had a mass of 1,060 kilograms (2,340 lb), and was used to demonstrate technology for the Midas programme, including infrared sensors. It remained in orbit until 23 January 1961, when it decayed and reentered the atmosphere.