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Titan 401B/Centaur

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AKA: Titan Centaur 401B. Status: Retired 2003. First Launch: 1997-10-15. Last Launch: 2003-09-09. Number: 7 . Payload: 9,000 kg (19,800 lb). Thrust: 15,000.00 kN (3,372,000 lbf). Gross mass: 939,000 kg (2,070,000 lb). Height: 62.20 m (204.00 ft). Diameter: 3.05 m (10.00 ft). Apogee: 400,000 km (240,000 mi).

LEO Payload: 9,000 kg (19,800 lb). Payload: 9,000 kg (19,800 lb) to a GTO.

• Cassini - . Nation: USA. Agency: NASA. Manufacturer: JPL. Class: Outer planets. Type: Outer planets probe. Spacecraft: Cassini. USAF Sat Cat: 25008 . COSPAR: 1997-061A. En route Venus.

• Huygens - . Nation: Europe. Agency: NASA Cleveland. Manufacturer: Cannes. Class: Outer planets. Type: Outer planets probe. Spacecraft: Huygens. USAF Sat Cat: 25009 . COSPAR: 1997-061B. Attached to Cassini.

• USA 139 - . Payload: Orion 4. Mass: 5,200 kg (11,400 lb). Nation: USA. Agency: NRO, NSA. Manufacturer: El Segundo. Class: Surveillance. Type: SIGINT. Spacecraft: Advanced Orion. USAF Sat Cat: 25336 . COSPAR: 1998-029A. Apogee: 35,800 km (22,200 mi). Perigee: 35,780 km (22,230 mi). Inclination: 0.00 deg. Period: 1,440.00 min.

• USA 143 - . Payload: Milstar-2 F1 / DFS 3. Mass: 4,500 kg (9,900 lb). Nation: USA. Agency: USAF. Manufacturer: Lockheed. Class: Communications. Type: Military communications satellite. Spacecraft: Milstar. USAF Sat Cat: 25724 . COSPAR: 1999-023A. Apogee: 5,149 km (3,199 mi). Perigee: 1,097 km (681 mi). Inclination: 28.20 deg.

  The Titan core vehicle operated correctly, but a software error in the Centaur stage resulted in all three planned burns being made at the wrong times, during the first orbit instead of over a six hour period. The three burns planned to place Milstar successively in a 170 x 190 km parking orbit, a geostationary transfer orbit, and finally geosynchronous orbit. Instead, at 19:00 GMT, several hours before the scheduled third burn, Milstar separated into a useless 740 km x 5000 km orbit. Milstar-2 F1 was the first upgraded Milstar with an extra Medium Data Rate payload with a higher throughput. The payload included EHF (44 GHz), SHF (20 GHz) and UHF communications transponders and satellite-to-satellite crosslinks, with narrow beams to avoid jamming.

• USA 157 - . Payload: Milstar-2 DFS 4. Mass: 4,670 kg (10,290 lb). Nation: USA. Agency: USAF. Manufacturer: Lockheed. Class: Communications. Type: Military communications satellite. Spacecraft: Milstar. USAF Sat Cat: 26715 . COSPAR: 2001-009A. Apogee: 35,768 km (22,225 mi). Perigee: 35,764 km (22,222 mi). Inclination: 4.50 deg. Period: 1,435.05 min.

  Military Communications satellite. Launch delayed from October 30, December 14, 2000, and February 2 and February 24, 2001. The Milstar DFS 4 satellite (the second Milstar Block 2) provided secure communications for the US Department of Defense, with UHF, EHF and SHF band transmitters. Titan 4B-41 with core stage K-30 took off from Cape Canaveral and placed Milstar and the Centaur TC-22 upper stage in a suborbital trajectory. TC-22 then ignited to enter a 200 km parking orbit, and after two more burns delivered Milstar to geosynchronous drift orbit. Small engines on board the Milstar placed it at its targeted geostationary position. USA 157, a 4.5 tonne spacecraft, was the first in the Milstar 2 series which was capable of higher data rates and was more secure against disabling efforts.

• USA 164 - . Payload: Milstar 2-F3 / Milstar FLT-5 / DFS-5. Mass: 4,550 kg (10,030 lb). Nation: USA. Agency: USAF. Manufacturer: Lockheed. Class: Communications. Type: Military communications satellite. Spacecraft: Milstar. USAF Sat Cat: 27168 . COSPAR: 2002-001A. Apogee: 35,800 km (22,200 mi). Perigee: 35,773 km (22,228 mi). Inclination: 1.46 deg. Period: 1,436.12 min.

  Military Communications satellite. Launch delayed from December 2001. The Titan core stage shut down 9 min after launch on a suborbital trajectory, and separated from the upper stage, Centaur TC-19. TC-19 made three burns to parking orbit, geostationary transfer orbit, and finally geostationary orbit. It then released Milstar Flt-5. Milstar provided secure communications in the EHF, SHF and UHF bands and would be stationed over European longitudes. As of 2007 Feb 16 located at 29.98E drifting at 0.014W degrees per day.

• USA 169 - . Payload: Milstar 6 / Milstar 2-F4. Mass: 4,500 kg (9,900 lb). Nation: USA. Agency: USAF. Manufacturer: Lockheed. Class: Communications. Type: Military communications satellite. Spacecraft: Milstar. USAF Sat Cat: 27711 . COSPAR: 2003-012A. Apogee: 35,811 km (22,251 mi). Perigee: 35,762 km (22,221 mi). Inclination: 0.91 deg. Period: 1,436.13 min. Delayed from November 4, 2002, and January 21, February 2 and 4, March 5, 8 and 21, and April 6, 2003. As of 2007 Feb 4 located at 89.84W drifting at 0.014W degrees per day..

• USA 171 - . Payload: Orion 5. Mass: 5,200 kg (11,400 lb). Nation: USA. Agency: NRO. Class: Surveillance. Type: SIGINT. Spacecraft: Advanced Orion. USAF Sat Cat: 27937 . COSPAR: 2003-041A. Apogee: 35,800 km (22,200 mi). Perigee: 35,780 km (22,230 mi). Inclination: 0.00 deg. Period: 1,440.00 min.

  American signals intelligence satellite placed into geostationary orbit. It was believed the payload was a successor to the USA-110 and USA-139 satellites launched in May 1995 and May 1998, referred to as 'Advanced ORION' by those not in the know. They were thought to be successors to the RHYOLITE missions of the 1970s. The satellite was originally to have launched April 28, 2002. Launch delayed seven times.