USA-229, known before launch as NRO Launch 34 (NROL-34), is a pair of American signals intelligence satellites which were launched in 2011. They are operated by the United States National Reconnaissance Office.
Names | NROL-34 NRO Launch 34 NOSS-3 5A and 5B Intruder 9A and 9B |
---|---|
Mission type | SIGINT |
Operator | United States NRO |
COSPAR ID | 2011-014A |
SATCAT no. | 37386 and 37391 |
Spacecraft properties | |
Spacecraft | NOSS-3 5 (3rd Generation) |
Spacecraft type | Intruder |
Bus | NOSS-3 |
Manufacturer | Lockheed Martin |
Launch mass | 3250 kg (each) |
Start of mission | |
Launch date | 15 April 2011, at 04:24 UTC |
Rocket | Atlas V 411 (AV-027) |
Launch site | Vandenberg, SLC-3E |
Contractor | ULA |
Orbital parameters | |
Reference system | Geocentric orbit |
Regime | Low Earth orbit |
Perigee altitude | 1015 km |
Apogee altitude | 1207 km |
Inclination | 63.46° [1] |
Both satellites were deployed by a United Launch Alliance Atlas V 411 launch vehicle, which launched from SLC-3E at the Vandenberg Air Force Base. The launch occurred at 04:24 UTC on 15 April 2011.[2] The rocket placed the satellites into a low Earth orbit. By 04:29 UTC, official updates on the status of the spacecraft had been discontinued.[3]
Whilst details of the satellites and their missions are officially classified, amateur observers have identified that the Atlas V deployed two satellites, one of which has officially been catalogued as debris. The two spacecraft have been identified as being a pair of third or fourth generation Naval Ocean Surveillance System satellites.[4] Amateur observations have located the spacecraft in an orbit with a perigee of 1,015 kilometres (631 mi) and an apogee of 1,207 kilometres (750 mi), inclined at 63.46° to the plane of the equator.[2] Current generation NOSS satellites are always launched and operated in pairs,[5] and are used to locate and track ships and aircraft from the radio transmissions that they emit.[6]
References
edit- ^ Molczan, Ted (24 April 2011). "NROL-34: NOSS 3-5 elements". SatObs.
- ^ a b McDowell, Jonathan. "Issue 640". Jonathan's Space Report. Retrieved 24 April 2011.
- ^ Ray, Justin. "Mission Status Center". Spaceflight Now. Retrieved 24 April 2011.
- ^ Ted, Molczan (17 April 2011). "NROL-34 - NOSS 3-5 pair spotted tonight from Austin, Texas". Satobs. Retrieved 24 April 2011.
- ^ Krebs, Gunter. "NOSS-3". Gunter's Space Page. Retrieved 24 April 2011.
- ^ Ray, Justin (18 April 2011). "Observers confirm identity of last week's Atlas payload". Spaceflight Now. Retrieved 24 April 2011.