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X

X.....Roman number for 10.

X band.....Electromagnetic frequencies between 8 to 12 GHZ. See band.

X-1.....U.S. Launch Vehicle. See Scout, 130 lbs (59 kg) LEO. First launch 1960/07/01

X-15.....U.S. Pilot Robert White, flew the X-15 to an altitude of 58.7 miles, qualifying for astronaut wings, and first to fly a winged aircraft/spacecraft into space on 1962/07/17. The X-15 first flew 1959/06/08, flew a total of 199 Flights with 3 qualifying for spacecraft.

X-17.....U.S., rocket, upper atmosphere reentry. First launch 1955/00/00

X-2.....U.S. Launch Vehicle. See Scout, 168 lbs (76 kg) LEO. First launch 1962/04/26

X-20A.....U.S., satellite. See DYNASOAR.

X-248.....U.S., launch vehicle motor, see Altair I.

X-248A5.....U.S., launch vehicle motor. Thrust 3100 lbf ( 13.6 kN), pressure ? psi (? bar), solid propellant ?. Used on Thor-Delta, and Delta launch vehicles.

X-248A7.....U.S., launch vehicle motor. Thrust 3100 lbf ( 13.6 kN), pressure ? psi (? bar), solid propellant ?. Used on Thor-Able launch vehicle.

X-259.....U.S., launch vehicle motor, Antares I,II, IIA, IIB.

X-3.....UK, satellite, see PROSPERO.

X-3.....U.S. Launch Vehicle. See Scout, 192 lbs (87 kg) LEO. First launch 1962/08/31

X-4.....UK satellite, see UK.

X-4.....U.S. Launch Vehicle. See Scout, 227 lbs (103 kg) LEO. First launch 1963/07/28

X-405.....U.S., launch vehicle motor, thrust 20,500 lbf (120 kN), pressure ? psi (? bar), liquid propellant LOX/Kerosene. Manufactured by General Electric. DoD Rocket Motor Designation LR-50. Used on the Vanguard launch vehicle.

X-MIR INSPECTOR.....Russia, satellite. First launch 1997/10/05

X-RAY MULTI MIRROR.....ESA, satellite. See XMM.

X-RAY OBSERVATORY SATELLITE.....Japan, See EXOSAT.

X-RAY TIMING EXPLORER.....U.S., satellite. See XTE.

X-RAY-ENVIRONMENTAL SATELLITE.....U.S., satellite, see VANGUARD, FTO. First launch 1958/04/29

X-rays.....Electromagnetic waves of short wavelength, capable of penetrating some thickness of matter. Medical x-rays are produced by letting a stream of fast electrons come to a sudden stop at a metal plate; it is believed that X-rays emitted by the Sun or stars also come from fast electrons.

X-SAT.....China, Singapore, satellite, minisatellite, Earth observation, environmental monitoring. First launch 2007/00/00

XB-65.....U.S., launch vehicle, became the Atlas Launch Vehicle, B-65, SM-65. See MX-1593

XC.....Roman number for 90.

xi.....Ξ, ξ, xi, 14, Greek Alphabet.

Xi'an Institute of Radio Technology.....China. See China Xi'an Institute of Radio Technology.

Xi'an Institute of Space Radio Technology.....China, aerospace company. Address: Division of Chinese Academy of Space Technology, 87, Chang An Nan Lu, Xi'an 110061, China

Xi'an Satellite Control Center.....China. See China Xi'an Satellite Control Center

Xi'an Satellite Testing and Monitoring Center.....China. See China Xi'an Satellite Testing and Monitoring Center

Xiamen tracking station.....China. See China Xiamen tracking station

Xian Satellite Monitor and Control Center.....China. See China Xian Satellite Monitor and Control Center

Xichang Satellite Launch Center.....China. See China Xichang Satellite Launch Center.

XINNUO.....China, satellite, communications. See SINOSAT.

XL.....Roman number for 40.

XL105NA5.....U.S., launch vehicle motor . See XLR-105N A 5.

XL89NA5.....U.S., launch vehicle motor . See XLR-89N A 5.

XLR-105N A 5.....U.S., launch vehicle motor. Atlas Stage 1, part of MA2 rocket engine.

XLR-115.....U.S., launch vehicle motor. Thrust 15,000 lbf (66 kN), pressure ? psi (? bar), liquid propellant LOX/LH2. Used on Centaur.

XLR-79N A 11.....U.S., launch vehicle motor, see MB-3 Block 2.

XLR-79N A 13.....U.S., launch vehicle motor. See MB-3 Block 3. Also known as LR-79N A 13.

XLR-79N A 5.....U.S., launch vehicle motor, see MB-1.

XLR-79N A 7.....U.S., launch vehicle motor. MB-3 Block 1engine. Used on Thor and Delta launch vehicles.

XLR-81-BA-5.....U.S., launch vehicle motor, see Hustler 8048.

XLR-89N A 5.....U.S., launch vehicle motor. Atlas Stage 1, part of MA2 rocket engine. Also known as LR-89.

XLR43-NA-1.....U.S., launch vehicle motor, thrust lbf ( kN), pressure psi ( bar), liquid propellant LOX/Alcohol. Used on the Navaho missile. Was basis for the Redstone, Jupiter, Thor and Atlas missile engines. Two verisons of the engine, A-6 [75,000 lbf (330 kN), liquid propellant LOX/Alcohol. Upgraded on Jupiter C to LOX/Hydyne, thrust 83,000 lbf (36k kN)] and A-7 [Mercury Redstone, thrust 78,000 lbf (343 kN) used liquid propellant LOX/Alcohol].

XLR87-AJ-5.....U.S., launch vehicle motor, experimental verison of LR87-AJ-5.

XLR91.....U.S., launch vehicle motor, experimental version of LR91.

XM.....U.S., satellite, radio transmission, GEO. First launch 2001/03/18

XM RADIO.....U.S., satellite, direct broadcast audio. First launch 2001/03/18

XM ROLL.....U.S., satellite, radio transmission, GEO. First launch 2001/05/08

XM-68.....U.S., launch vehicle motor, see Algol I.

XM9.....U.S., launch vehicle. Army, Redstone, IRBM.

XMM.....Europe, ESA, satellite, scientific, HEO. X-RAY MULTI MIRROR. Was named Newton X-Ray Telescope. First launch 1999/12/10

XMM-NEWTON.....Europe, ESA, satellite, see XMM.

XMROCK.....U.S., satellite, communications, radio transmission. First launch 2001/03/18

Xolotl.....Aztec, Venus god.

XSC.....China, space vehicle launch facility, Xichang Space Center. See Xichang Satellite Launch Center.

XSCC.....China, organization, see China Xian Satellite Monitor and Control Center.

XSLC.....China, space vehicle launch facility. See Xichang Satellite Launch Center.

XSM-68B.....U.S., launch vehicle, Titan II.

XSS.....U.S., Air Force, satellite, technology, LEO. First launch 2003/01/29

XSTAR.....Europe, satellite, Earth observation. Agriculture and precision farming.

XSTMC.....China, organization. See China Xi'an Satellite Testing and Monitoring Center.

XTAR-EUR.....Spain, satellite, military communications, GEO.)soo5/02/21} First launch 2005/02/12

XTE.....U.S. satellite, scientific, LEO SSO. X-RAY TIMING EXPLORER, study of X-ray source illuminations. Also known as RXTE.

- XTE, 1995 074A, 1995/12/30, WSMC, Delta 2, LEO, ROSSI.

First launch 1995/12/30

XX.....Roman number for 20.

XXC.....Roman number for 80.

XXX.....Roman number for 30.

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Updated 2007/2/01