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Intruder 5, ..., 12 (NOSS-3 1, ..., 8)

NOSS-3 (Naval Ocean Surveillance System), which is likely not the official designation, is the third generation of NOSS satellites. In 2013, the designation Intruder leaked out. These satellites carry equipment to track ships and aircraft via their radio transmissions. Positions of the origin of the transmissions are determined by triangulation. Each launch consists of two satellites of similar size in the same orbit. Both satellites maneuver to stationkeep relative to one another.

In contrast to the earlier first generation (Parcae) and second generation (Intruder 1-4) constellations, it features only two satellites. Notably absent is also the dispenser unit, which deployed the earlier generations. Like the earlier generations, it features the same orbit. Each pair has reportedly a combined wight of 6500 kg.

The fourth launch was left in a slightly too low orbit, as the Centaur upper stage shut down too early during the second burn. The payload was able to reach it's intended orbit on its own propulsion system. Due to this problem the launch vehicle configuration was changed for the next launch from Atlas-5(401) to Atlas-5(411) to allow a single burn mission for greater reliability. After confidence was restored, the launches reverted back to the Atlas-5(401) version.

Nation: USA
Type / Application: Ocean Surveillance
Operator: US Navy
Contractors: Lockheed Martin
Equipment: ?
Configuration: ?
Propulsion: ?
Power: Solar arrays, batteries
Lifetime:
Mass: ~ 6500 kg each pair
Orbit: 1100 km × 1100 km, 63
Satellite COSPAR Date LS Launch Vehicle Remarks
Intruder 5A (NOSS-3 1A, USA 160, NROL 13) 2001-040A 08.09.2001 Va SLC-3E Atlas-2AS with Intruder 5B
Intruder 5B (NOSS-3 1B, USA 160-2, NROL 13) 2001-040C 08.09.2001 Va SLC-3E Atlas-2AS with Intruder 5A
Intruder 6A (NOSS-3 2A, USA 173, NROL 18) 2003-054A 02.12.2003 Va SLC-3E Atlas-2AS with Intruder 6B
Intruder 6B (NOSS-3 2B, USA 173-2, NROL 18) 2003-054C 02.12.2003 Va SLC-3E Atlas-2AS with Intruder 6A
Intruder 7A (NOSS-3 3A, USA 181, NROL 23) 2005-004A 03.02.2005 CC SLC-36B Atlas-3B-SEC with Intruder 7B
Intruder 7B (NOSS-3 3B, USA 181-2, NROL 23) 2005-004C 03.02.2005 CC SLC-36B Atlas-3B-SEC with Intruder 7A
Intruder 8A (NOSS-3 4A, USA 194, NROL 30) 2007-027A 15.06.2007 CC SLC-41 p Atlas-5(401) with Intruder 8B
Intruder 8B (NOSS-3 4B, USA 194-2, NROL 30) 2007-027C 15.06.2007 CC SLC-41 p Atlas-5(401) with Intruder 8A
Intruder 9A (NOSS-3 5A, USA 229, NROL 34) 2011-014A 15.04.2011 Va SLC-3E Atlas-5(411) with Intruder 9B
Intruder 9B (NOSS-3 5B, USA 229-2, NROL 34) 2011-014C 15.04.2011 Va SLC-3E Atlas-5(411) with Intruder 9A
Intruder 10A (NOSS-3 6A, USA 238, NROL 36) 2012-048A 13.09.2012 Va SLC-3E Atlas-5(401) with Intruder 10B, CINEMA 1, Aeneas, SMDC-ONE 2.1, SMDC-ONE 2.2, STARE A, CSSWE, CXBN, AeroCube 4A, AeroCube 4B, AeroCube 4C, CP 5, OUTSat
Intruder 10B (NOSS-3 6B, USA 238-2, NROL 36) 2012-048P 13.09.2012 Va SLC-3E Atlas-5(401) with Intruder 10A, CINEMA 1, Aeneas, SMDC-ONE 2.1, SMDC-ONE 2.2, STARE A, CSSWE, CXBN, AeroCube 4A, AeroCube 4B, AeroCube 4C, CP 5, OUTSat
Intruder 11A (NOSS-3 7A, NROL 55) - 2015 Va SLC-3E Atlas-5(401) with Intruder 11B, Lightsail 1, ARC, BisonSat, Fox 1, cubesats
Intruder 11B (NOSS-3 7B, NROL 55) - 2015 Va SLC-3E Atlas-5(401) with Intruder 11A, Lightsail 1, ARC, BisonSat, Fox 1, cubesats
Intruder 12A (NOSS-3 8A, NROL 79) - 2017 Va SLC-3E Atlas-5(401) with Intruder 12B
Intruder 12B (NOSS-3 8B, NROL 79) - 2017 Va SLC-3E Atlas-5(401) with Intruder 12A