OPS 3762
Mission typeRadar imaging
OperatorUS National Reconnaissance Office
COSPAR ID1964-087A Edit this at Wikidata
SATCAT no.00964Edit this on Wikidata
Mission duration4 days
Spacecraft properties
Spacecraft typeQuill
Lockheed (Agena)
Launch mass1,500 kilograms (3,300 lb)
Start of mission
Launch date21 December 1964, 19:08:56 (1964-12-21UTC19:08:56Z) UTC
RocketTAT SLV-2A Agena-D 425
Launch siteVandenberg LC-75-1-1
End of mission
DeactivatedDecember 1964 (1965-01)
Decay date11 January 1965
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude238 kilometers (148 mi)
Apogee altitude264 kilometers (164 mi)
Inclination70.1 degrees
Period89.4 minutes
Epoch21 December 1964, 14:12:00 UTC[1]

OPS 3762, also known as FTV-2355, was an American reconnaissance satellite which was launched in 1964.[2] It was the first radar imaging satellite to be launched, and the only Quill spacecraft to fly. Its mission was to demonstrate radar imaging techniques for future missions. However, the programme was cancelled before any more satellites were launched.[3]

OPS 3762 was successfully launched aboard a Thrust Augmented Thor SLV-2A Agena-D carrier rocket, flying from Launch Complex 75-1-1 at the Vandenberg Air Force Base. The launch, which was the last orbital launch of the year, occurred at 19:08:56 UTC on 21 December 1964, and successfully placed the spacecraft into the low Earth orbit in which it conducted its mission.[4] Owing to concerns that using radar over the Soviet Union may have been seen as provocative, OPS 3762 conducted imaging tests over the Northwestern United States instead.[5]

OPS 3762 was a 1,500 kilograms (3,300 lb) spacecraft, based on the Agena-D which also served as the upper stage of its carrier rocket.[6] It operated for four days. Its orbit had a perigee of 208 kilometres (129 mi), an apogee of 222 kilometres (138 mi), 70 degrees of inclination, and an orbital period of 88.8 minutes.[2] Its side looking airborne radar produced images, which were returned in a KH-4 film capsule at the end of the mission.[7] OPS 3762 itself remained in orbit until 11 January 1965, when its orbit decayed and it reentered the atmosphere.[2] OPS 3762 completed its mission successfully.[8]

See also


  1. ^ "NASA - NSSDCA - Spacecraft - Trajectory Details". nssdc.gsfc.nasa.gov. Retrieved 2018-05-02.
  2. ^ a b c McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 9 June 2010.
  3. ^ Day, Dwayne A. (24 May 2010). "Flight of a feather: the QUILL radar satellite". The Space Review. Retrieved 9 June 2010.
  4. ^ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 9 June 2010.
  5. ^ Richelson, Jeffrey T. (January 2009). "Ups and Downs of Space Radars". airforce-magazine.com. Retrieved 9 June 2010.
  6. ^ Krebs, Gunter. "Quill". Gunter's Space Page. Retrieved 9 June 2010.
  7. ^ "Space Radars". docstoc. Retrieved 9 June 2010.
  8. ^ Day, Dwayne A. (22 January 2007). "Radar love: the tortured history of American space radar programs". The Space Review. Retrieved 9 June 2010.