USA-229
| Mission type | SIGINT |
|---|---|
| Operator | US NRO |
| COSPAR ID | 2011-014A |
| SATCAT no. | 37386 |
| Spacecraft properties | |
| Bus | NOSS-3 or NOSS-4 |
| Start of mission | |
| Launch date | 04:24, April 15, 2011 |
| Rocket | Atlas V 411 AV-027 |
| Launch site | Vandenberg SLC-3E |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 1,017 km |
| Apogee altitude | 1,204 km |
| Inclination | 63.45°[1] |
| Epoch | April 2011 |
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.
Both satellites were deployed by a United Launch Alliance Atlas V 411 carrier rocket, which launched from Space Launch Complex 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 1,025 kilometres (637 mi) and an apogee of 1,207 kilometres (750 mi), inclined at 64.4 degrees 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 from the radio transmissions that they emit.[6]
References
- ^ Molczan, Ted (2011-04-21). "NROL-34: NOSS 3-5 elements". SeeSat-L.
- ^ a b McDowell, Jonathan. "Issue 640". Jonathan's Space Report. Retrieved 24 April 2011.
- ^ Ray, Justin. "Mission Status Center". Atlas Mission Report. Spaceflight Now. Retrieved 24 April 2011.
- ^ Ted, Molczan (17 April 2011). "RE: NROL-34 - NOSS 3-5 pair spotted tonight from Austin, TX". SeeSat-L. 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.
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