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Intruder
Intruder was a naval electronic intelligence satellite for the National Reconnaissance Office (NRO).

Status: Operational 1990. First Launch: 1990-06-08. Last Launch: 2015-10-08. Number: 26 .

Compared to earlier satellites on this mission, the launch vehicle was changed from the Titan to the Atlas. Placed by two burns of the Atlas Centaur upper stage into an 1100 x 1100 km x 63 deg orbit. The design was apparently different from earlier generation NOSS satellites since only one companion satellite was deployed rather than two, in line with the lower payload capability of the Atlas. Prime contractor for the new satellites was believed to be Lockheed Martin Astronautics at Denver. The NRL probably continued to have a management and technical role in the program under overall NRO auspices.



Family: Surveillance. Country: USA. Launch Vehicles: Titan, Atlas, Titan 405A, Titan 403A, Atlas IIAS, Atlas V, Atlas V 401, Atlas 3B, Atlas V 411. Launch Sites: Vandenberg SLC3E, Vandenberg SLC4E, Cape Canaveral LC36B, Cape Canaveral LC41.

1990 June 8 - . 05:22 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC41. LV Family: Titan. Launch Vehicle: Titan 405A.
  • USA 59 - . Payload: Intruder 1. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 20641 . COSPAR: 1990-050A. Apogee: 284 km (176 mi). Perigee: 268 km (166 mi). Inclination: 61.0000 deg. Period: 90.00 min. First launch by Titan 4 of new generation of NOSS naval reconnaissance satellites. However earlier NOSS weighed only 2,000 kg; Titan 4 booster has seven times this capacity. What else was launched?.
  • USA 61 - . Payload: Intruder 1. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 20691 . COSPAR: 1990-050C. Apogee: 1,304 km (810 mi). Perigee: 920 km (571 mi). Inclination: 63.4250 deg. Period: 107.44 min.
  • USA 62 - . Payload: Intruder 1. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 20692 . COSPAR: 1990-050D. Apogee: 1,303 km (810 mi). Perigee: 920 km (572 mi). Inclination: 63.4240 deg. Period: 107.44 min.
  • USA 60 - . Payload: Intruder 1. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 20682 . COSPAR: 1990-050B. Apogee: 1,146 km (712 mi). Perigee: 1,071 km (665 mi). Inclination: 63.4000 deg. Period: 107.45 min.

1991 November 8 - . 07:07 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4E. LV Family: Titan. Launch Vehicle: Titan 403A.
  • USA 72 - . Payload: Intruder 2. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 21775 . COSPAR: 1991-076A. Apogee: 1,321 km (820 mi). Perigee: 799 km (496 mi). Inclination: 63.4000 deg. Period: 106.40 min. Second launch by Titan 4 of new generation of NOSS naval reconnaissance satellites. However earlier NOSS weighed only 2,000 kg; Titan 4 booster has seven times this capacity. What else was launched?.
  • USA 74 - . Payload: Intruder 2. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 21799 . COSPAR: 1991-076C. Apogee: 1,270 km (789 mi). Perigee: 954 km (593 mi). Inclination: 63.4270 deg. Period: 107.44 min.
  • USA 77 - . Payload: Intruder 2. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 21809 . COSPAR: 1991-076E. Apogee: 1,270 km (789 mi). Perigee: 954 km (593 mi). Inclination: 63.4270 deg. Period: 107.44 min.
  • USA 76 - . Payload: Intruder 2. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 21808 . COSPAR: 1991-076D. Apogee: 1,270 km (789 mi). Perigee: 954 km (593 mi). Inclination: 63.4280 deg. Period: 107.44 min.

1993 August 2 - . 19:59 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4E. LV Family: Titan. Launch Vehicle: Titan 403A. FAILURE: Radial cut inadvertently made in SRM during repairs resulted in explosion of SRM and vehicle at T+101 seconds.. Failed Stage: 0.
  • NOSS 19 - . Payload: Intruder 3. Nation: USA. Agency: USN. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. Decay Date: 1993-08-02 . Apogee: 33 km (20 mi). Third attempted launch by Titan 4 of new generation of NOSS naval reconnaissance satellites. No known launches of this system thereafter..
  • SSU - . Payload: Intruder 3. Nation: USA. Agency: USAF AFMC. Spacecraft: Intruder. Apogee: 33 km (20 mi).
  • SSU - . Payload: Intruder 3. Nation: USA. Agency: USAF AFMC. Spacecraft: Intruder. Apogee: 33 km (20 mi).

1996 May 12 - . 21:32 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4E. LV Family: Titan. Launch Vehicle: Titan 403A.
  • USA 121 - . Payload: Intruder 4. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 23908 . COSPAR: 1996-029C. Apogee: 1,160 km (720 mi). Perigee: 1,055 km (655 mi). Inclination: 63.4000 deg. Period: 107.40 min.
  • USA 120 - . Payload: Intruder 4. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 23907 . COSPAR: 1996-029B. Apogee: 1,157 km (718 mi). Perigee: 1,058 km (657 mi). Inclination: 63.4000 deg. Period: 107.40 min.
  • USA 122 - . Payload: Intruder 4. Nation: USA. Agency: NRL, NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 23862 . COSPAR: 1996-029D. Apogee: 1,156 km (718 mi). Perigee: 1,060 km (650 mi). Inclination: 63.4000 deg. Period: 107.40 min.

2001 September 8 - . 15:25 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas. Launch Vehicle: Atlas IIAS.
  • USA 160 - . Payload: Intruder 5 / MLV-10. Mass: 5,000 kg (11,000 lb). Nation: USA. Agency: NRO. Manufacturer: Martin. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 26905 . COSPAR: 2001-040A. Apogee: 1,200 km (700 mi). Perigee: 1,060 km (650 mi). Inclination: 63.4000 deg. Period: 107.40 min.

    Launch delayed from July 31. Move of launch of the Intruder naval electronic intelligence satellites for the National Reconnaissance Office (NRO) from the Titan to the Atlas launch vehicle. The Lockheed Martin Atlas IIAS AC-160 put the vehicle in a transfer orbit. The phrasing of the launch commentary implied that the second burn left the payload in 'transfer orbit', but several observers saw the bright Centaur in the typical final deployment orbit of the earlier NOSS satellites. Therefore it seemed the first burn was to a transfer orbit of around 180 x 1100 km x 63 deg. The second burn at 1629 GMT put the Centaur and payload into an 1100 x 1100 km x 63 deg orbit. The design was apparently different from earlier generation NOSS satellites since only one companion satellite was deployed rather than two, in line with the lower payload capability of the Atlas. Prime contractor for the new satellites was again believed to be Lockheed Martin Astronautics at Denver. The NRL probably continued to have a management and technical role in the program under overall NRO auspices.

  • USA 160 companion - . Payload: Intruder 5 / MLV-10. Mass: 5,000 kg (11,000 lb). Nation: USA. Agency: NRO. Manufacturer: Martin. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 26907 . COSPAR: 2001-040C. Apogee: 1,200 km (700 mi). Perigee: 1,060 km (650 mi). Inclination: 63.4000 deg. Period: 107.40 min.

2003 December 2 - . 10:04 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas. Launch Vehicle: Atlas IIAS.
  • USA 173 - . Payload: Intruder 6 / NROL-18. Nation: USA. Agency: NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 28095 . COSPAR: 2003-054A. Apogee: 1,210 km (750 mi). Perigee: 1,010 km (620 mi). Inclination: 63.4000 deg. Period: 107.40 min. Second launch of new generation paired satellites used for tracking, characterisation, and intelligence on naval vessels and civilian shipping worldwide..
  • USA 173 companion - . Payload: Intruder 6 / NROL-18. Nation: USA. Agency: NRO. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 28097 . COSPAR: 2003-054C. Apogee: 1,210 km (750 mi). Perigee: 1,010 km (620 mi). Inclination: 63.4000 deg. Period: 107.40 min.

2005 February 3 - . 07:41 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. Launch Pad: SLC36B. LV Family: Atlas. Launch Vehicle: Atlas 3B.
  • USA 181 - . Payload: Intruder 7. Nation: USA. Agency: ILS. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 28537 . COSPAR: 2005-004A. Apogee: 1,209 km (751 mi). Perigee: 1,011 km (628 mi). Inclination: 63.4000 deg. Period: 107.40 min.

    Last launch of an Atlas model using the original, innovative, balloon propellant tanks conceived in 1947. Third launch of new generation paired satellites used for tracking, characterisation, and intelligence on naval vessels and civilian shipping worldwide.

  • USA 181 companion - . Payload: Intruder 7. Nation: USA. Agency: ILS. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 28541 . COSPAR: 2005-004C. Apogee: 1,209 km (751 mi). Perigee: 1,011 km (628 mi). Inclination: 63.4000 deg. Period: 107.40 min.

2007 June 15 - . 15:11 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC41. Launch Pad: SLC41. LV Family: Atlas V. Launch Vehicle: Atlas V 401.
  • USA 194 - . Payload: Intruder 8. Nation: USA. Agency: NRO. Manufacturer: Lockheed. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 31701 . COSPAR: 2007-027A. Apogee: 1,246 km (774 mi). Perigee: 776 km (482 mi). Inclination: 63.4000 deg.

    Classified National Reconnaissance Office mission. There appeared to be problem in the second burn of the Centaur upper stage. Amateur observors believed that two satellites were to be have been deployed in 1150 km altitude, 63 deg inclination, but that only a 776 km x 1246 km was achieved. However it was believed that the payloads could reach the final intended orbits using on-board propulsion


2011 April 15 - . 04:24 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas V. Launch Vehicle: Atlas V 411.
  • USA 229 - . Payload: Intruder 9 / NROL-34. Mass: 3,250 kg (7,160 lb). Nation: USA. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 37386 . COSPAR: 2011-014A. Apogee: 1,200 km (700 mi). Perigee: 1,010 km (620 mi). Inclination: 63.4000 deg. Period: 107.40 min. Probable naval ocean surveillance satellite cluster; normally operate in 1100 km circular orbits with 63 deg inclination and carry equipment to track ships and aircraft via their radio transmissions..
  • USA 229 P/L 2 - . Payload: Intruder 9 / NROL-34. Mass: 3,250 kg (7,160 lb). Nation: USA. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 37391 . COSPAR: 2011-014B. Apogee: 1,200 km (700 mi). Perigee: 1,010 km (620 mi). Inclination: 63.4000 deg. Period: 107.40 min. Probable naval ocean surveillance satellite cluster; normally operate in 1100 km circular orbits with 63 deg inclination and carry equipment to track ships and aircraft via their radio transmissions..

2012 September 13 - . 21:39 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas V. Launch Vehicle: Atlas V 401.
  • USA 238 - . Payload: Intruder 10 / NROL-36. Mass: 6,500 kg (14,300 lb). Nation: USA. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 38758 . COSPAR: 2012-048A. Apogee: 1,200 km (700 mi). Perigee: 1,010 km (620 mi). Inclination: 63.4000 deg. Period: 107.40 min. NROL-36 mission, believed to be a naval signals intelligence satellite.

2015 October 8 - . 12:49 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas V. Launch Vehicle: Atlas V 401.
  • USA 264 - . Payload: Intruder 11 / NROL-55. Mass: 6,500 kg (14,300 lb). Nation: USA. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 40964 . COSPAR: 2015-058A. Apogee: 1,201 km (746 mi). Perigee: 1,014 km (630 mi). Inclination: 63.4000 deg.

    The Atlas deployed two NRO satellites and a cluster of cubesats in orbit. Items listed as USA 264 and USA 264 'debris', thought to be a clandestine active payload, were deployed in a 1014 km x 1201 km x 63.4 deg orbit. The satellites were believed to be NRO/Navy signals intelligence satellites, the latest successors to the GRAB/POPPY series, and probably codenamed INTRUDER. Following deployment of the main payloads, the Centaur upper stage made two further burns to a 496 km x 800 km x 64.8 deg orbit and deployed the cubesats from GRACE, the fourth NPS Cubesat Launcher flown on an Atlas Aft Bulkhead Carrier.

  • USA 264 Payload 2 - . Nation: USA. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Intruder. USAF Sat Cat: 40981 . COSPAR: 2015-058R. Apogee: 1,201 km (746 mi). Perigee: 1,014 km (630 mi). Inclination: 63.4000 deg. Believed to be subsatellite of USA 246 sigint satellite..

2017 March 1 - . 17:49 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas V. Launch Vehicle: Atlas V 401.
  • USA 274 - . Payload: INTRUDER. Nation: USA. Class: Surveillance. Type: ELINT. Spacecraft: Intruder. USAF Sat Cat: 42058 . COSPAR: 2017-011A. Apogee: 1,204 km (748 mi). Perigee: 1,010 km (620 mi). Inclination: 63.4000 deg.

    Atlas V serial AV-068 carried a National Reconnaissance Office payload to orbit on NRO launch NROL-79. The payload was thought to be an NRO/Navy signals intelligence system code-named INTRUDER consisting of a pair of satellites in 1010 x 1200 km x 63 deg orbit. Both satellites were observed by hobbyists on Mar 3. The Centaur second stage was deorbited south of Australia on the first orbit with impact around 1956 UTC.

  • USA 274 P/L 2 - . Nation: USA. Class: Surveillance. Type: ELINT. Spacecraft: Intruder. USAF Sat Cat: 42065 . COSPAR: 2017-011B. Apogee: 1,204 km (748 mi). Perigee: 1,009 km (626 mi). Inclination: 63.5000 deg.


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