Related by context. All words. (Click for frequent words.) 72 GIOVE B 68 MetOp 62 GSTB V2 61 TanDEM X 60 Metop 59 Giove B 59 Galileo satellites 59 satellite Giove 59 KURS 58 Jules Verne ATV 58 SIRAL 57 TerraSAR X 56 Resourcesat 2 56 GOES O 56 GPS IIF 56 INSAT 3A 56 Orbit Validation Element 56 Proba 2 56 Moon Mineralogy Mapper M3 56 BSAT 3a 56 Highly Adaptable Satellite 56 geosynchronous satellite 55 SMOS 55 GOCE 55 LEOP 55 Vehicle ATV 55 ATV Jules Verne 55 Ocean Salinity SMOS 55 Convection Rotation 54 KA SAT satellite 54 Globalstar satellites 54 BSAT 3b 54 Insat 4CR 54 GOCE satellite 54 Skynet 5C 54 EUMETSAT 54 AEHF satellite 54 CARTOSAT 54 W2A satellite 54 Cosmo SkyMed 54 SAR Lupe 53 XTAR EUR 53 GPS IIR M 53 L5 signal 53 Eutelsat W2A satellite 53 Astrium GmbH 53 GPS IIR 53 PSLV C# 53 Helios 2B 53 PSLV C7 53 Orbit Validation 53 polarimetric 53 Spirent GSS# 53 Rosetta orbiter 52 ICO G1 52 Septentrio 52 SCISAT 52 Satellites GOES 52 TDRSS 52 PSLV rocket 52 HEO payload 52 orbiting gamma ray 52 MeerKAT 52 Astra 3B 52 UK DMC2 52 Astra 1L 52 Ocean Salinity 52 Ariane 5G 52 Philae lander 52 antenna reflector 52 Eurostar E# 52 STSS satellites 52 ESA Rosetta 52 LISA Pathfinder 52 PSLV C 52 Anik F3 52 polar orbiting 51 INSAT 4B 51 Synthetic Aperture Radar SAR 51 Spacebus 51 GPS 2R 51 ASTRA 1KR 51 Minotaur IV 51 COROT 51 PSLV C6 51 D CIXS 51 Planetary Transits 51 INSAT 3E 51 ESTRACK 51 Oceansat 2 51 Eutelsat KA SAT 51 Thales Alenia 51 ESA Planck 51 Cartosat 2B 51 Eurockot 51 Beidou satellite 51 QZSS 51 Telstar #N 51 Astrium Satellites 51 CrIS 51 SatNews 51 EUTELSAT 51 Telespazio 51 MetOp satellite 51 geostationary 51 geostationary satellite 51 NFIRE 51 COSMO SkyMed 51 GLAST spacecraft 51 Foton spacecraft 51 INSAT 4CR 51 Proton Breeze M 51 polar orbiting satellites 50 Cartosat 2A 50 ISRO Polar 50 GAGAN 50 MEASAT 3a 50 ASTRA 1L 50 Fregat upper stage 50 Cryosat 50 Satellite Launch Vehicle GSLV 50 hyperspectral imager 50 Microwave Imaging Radiometer 50 Nimiq 5 50 Multi Purpose Logistics Module 50 ICO G1 satellite 50 Insat 50 nanosatellite 50 ASTRA 1M 50 Lunar Reconnaissance Orbiter LRO 50 geo synchronous transfer 50 Observatory STEREO 50 Vehicle PSLV 50 O OREOS 50 MTSAT 50 planetary Transits 50 JCSAT 9 50 geo stationary orbit 50 ESA ERS 50 SMOS satellite 50 Cospas Sarsat 50 KA SAT 50 radio occultation 50 Soyuz launcher 50 Eurostar E# platform 50 Insat 4A 50 hydrogen maser 50 Skripochka 50 Insat 3A 49 DigitalGlobe WorldView 49 Soyuz FG 49 Synthetic Aperture Radar 49 Turksat 4A 49 A# spacecraft 49 geostationary earth 49 Starsem 49 Orbital Express 49 PSLV C8 49 LMCSS 49 Thales Alenia Space 49 MARSIS 49 Long Baseline Interferometry 49 ExoMars rover 49 ILS Proton 49 Galileo constellation 49 Arabsat 5A 49 Ariane rocket 49 ESA SMOS 49 GOES N 49 EchoStar XIV 49 Dnepr rocket 49 BepiColombo 49 HAMSAT 49 Soyuz #S 49 Rockot 49 ATV Johannes Kepler 49 SCIAMACHY 49 geosynchronous satellites 49 Delfi C3 49 EKV 49 Automated Transfer Vehicle 49 INSAT 4A 49 NASA Stratospheric Observatory 49 CALIPSO 49 Skynet 5B 49 SBSS satellite 49 SISLink 49 Redu Belgium 49 fiber optic gyroscopes 49 Alphabus 49 Rosetta comet chaser 49 spaceborne 49 SMOS Soil Moisture 49 Solid Rocket Boosters 49 Full Operational Capability 49 VIRTIS 49 Koreasat 6 49 NROL 49 Geosynchronous Transfer Orbit GTO 49 GB GRAM 49 orbit GEO 49 NOAA GOES 48 ARISSat 48 LRO LCROSS 48 ESO VLT 48 pressurized module 48 Wideband Global 48 GLONASS satellites 48 Ariane launcher 48 SBSS Block 48 Zenit 3SL rocket 48 THEMIS mission 48 Planck telescope 48 Stratospheric Observatory 48 Satellite Successfully Launched 48 Permanent Multipurpose Module PMM 48 Cosmodrome 48 Yuri Lonchakov 48 Fregat 48 VIIRS 48 Proba 48 Block IIF 48 System MUOS 48 Orbiter LRO 48 ASTRA 3B 48 SSTL 48 Mars Climate Sounder 48 Cloud Aerosol Lidar 48 geosynchronous GEO 48 EchoStar XV 48 Planck spacecraft 48 CARTOSAT 2A 48 Environmental Satellite POES 48 GPS IIF satellites 48 telemetry tracking 48 YES2 48 PSLV C9 48 Cartosat 48 HYLAS 48 geo synchronous 48 Ulysses spacecraft 48 geo stationary satellite 48 geo synchronous orbit 48 Telstar #R 48 Vehicle GSLV 48 Alcatel Alenia Space 48 Polar Satellite Launch 48 VeeLo NextGen 48 Pegasus XL 48 Geosynchronous Transfer Orbit 48 ESTEC 48 Ku Band 48 Meteosat 48 Instrument OMI 48 Glonass satellites 48 Infrared Pathfinder Satellite 48 Oceansat 48 GPS IIF satellite 48 array AESA 48 sun synchronous orbit 48 Suite VIIRS 48 ESA Huygens probe 48 Landsat Data 48 Polar Operational 47 ENVISAT 47 ESA Proba 47 MT#C 47 geosynchronous 47 CBERS 47 RESOURCESAT 47 GPS GLONASS 47 Samokutyayev 47 NASA Stardust spacecraft 47 orbit GTO 47 Telemetric 47 Geostationary 47 Chandrayan 47 IBEX spacecraft 47 JCSAT 47 GSAT 5P 47 ESA GOCE 47 TecSAR 47 Huygens Probe 47 LAGEOS 47 Active Passive 47 Plesetsk Cosmodrome 47 gradiometer 47 Astrosat 47 COSPAS SARSAT 47 Astrium 47 ESRIN 47 W2A 47 NPOESS Preparatory Project 47 CHIPSat 47 SICRAL 1B 47 MT#A 47 Logistics Module 47 Atlas IIAS 47 Infoterra GmbH 47 CBERS 2B 47 supersonic combustion 47 Integral Systems EPOCH IPS 47 MPLM 47 Infrared Astronomy 47 radar altimeter 47 indigenous cryogenic stage 47 Chang'eI 47 GPS SBAS 47 Skynet 5A 47 Radiation Dose Monitor 47 SES Americom AMC 47 W7 satellite 47 interferometric synthetic aperture radar 47 Japan Kibo laboratory 47 Soyuz Fregat 47 Express orbiter 47 SMOS mission 47 HeliScope 47 geostationary transfer 47 ASTRA 1N 47 GPS IIIA 47 Mars Reconnaissance Orbiter MRO 47 PSLV C# rocket 47 ST5 47 Eurobot 47 DigitalGlobe WorldView 2 47 geostationary satellites 47 Orbit Validation IOV 47 wideband RF 47 RISAT 2 47 Sumbandila 47 GSLV rockets 47 ESA Envisat satellite 47 8PSK 47 GPS Block IIR 47 Phobos Grunt 47 SSETI Express 47 e VLBI 47 POES 47 DMSP F 47 Planck satellite 47 Insat 4B 47 SumbandilaSat 47 Foton M2 47 Kourou French Guyana 47 A#p laptop 47 Australian SKA Pathfinder 47 GMES Space 46 Turksat 3A 46 EADS Astrium GmbH 46 ESOC 46 Spaceway F1 46 GNSS receiver 46 Herschel Planck 46 WGS Block 46 Astrium Eurostar 46 Mojix STAR 46 radiotelescope 46 MTSAT 1R 46 External Stowage Platform 46 OHB System AG 46 ProtoStar II 46 Continuity Mission LDCM 46 Quasi Zenith Satellite 46 X ray telescope 46 Jules Verne Automated Transfer 46 SBIRS HEO 46 remote sensing satellites 46 OSIRIS 46 Personal Locator Beacon 46 astronomical telescope 46 NH# TTH 46 Milstar satellite 46 Anik F1R 46 Advanced Microwave Scanning 46 Anik G1 46 WISE infrared 46 GPS Block IIF 46 ESA Envisat 46 Shallow Subsurface Radar 46 SHARAD 46 COM DEV 46 HRSC 46 Glonass K 46 Geo synchronous 46 orbiting observatories 46 EPOCh 46 Phased Array 46 ESA astronaut 46 System SBIRS 46 Hubble gyroscopes 46 geosynchronous transfer orbit 46 Galileo Avionica 46 Alphasat 46 Optus D2 46 propulsion subsystem 46 Kayser Threde 46 EarthCARE 46 CryoSat mission 46 Eumetsat 46 SARSAT 46 Smos 46 satellite GSAT 46 STTS 46 Synthetic Aperture 46 GOES satellites 46 Total Ozone Mapping 46 geo stationary 46 Léopold Eyharts 46 RADARSAT 2 46 MUOS satellite 46 ESA Earth Observation 46 Optus D1 46 ILS Proton launch 46 NEAR Shoemaker 46 comet chaser 46 AVHRR 46 inertial navigation system 46 GeneSat 46 remote sensing satellite 46 Cosmic Origins Spectrograph COS 46 WAAS EGNOS 46 ASKAP 46 Taurus XL rocket 46 INSAT 3D 46 parameter measurements 46 Egnos 46 Technology Insertion 46 astrometric 46 GPS IIR satellites 46 Cubesat 46 VOR ILS 45 XFP MSA 45 HIAPER 45 Geo Synchronous Launch Vehicle 45 Imaging Spectrometer MERIS 45 Vehicle OBV 45 infrared observatory 45 German SAR Lupe 45 GPS OCX 45 indigenously developed cryogenic 45 TORU 45 Astra 1M 45 multibeam 45 ESA Herschel 45 interferograms 45 inertial measurement unit 45 Nimiq 4 45 Alenia Space 45 EGNOS 45 meteorological satellites 45 GMES 45 Soil Moisture 45 ILS Proton rocket 45 P#/P# truss 45 nanosatellites 45 Meteorological Satellites 45 diplexer 45 Satellite Launch Vehicle PSLV 45 NAVSTAR 45 optical modulation analyzer 45 Apstar 45 Kourou spaceport 45 Earth Observation Satellite 45 GeneSat 1 45 Medspiration 45 gamma ray spectrometer 45 ROCSAT 2 45 Gravity Probe B 45 DIRECTV 9S 45 Vehicle PSLV rocket 45 Anik F2 45 Security GMES 45 WGS satellite 45 ESO telescope 45 TsUP 45 Earth Observation 45 Wide Area Augmentation 45 ExoMars mission 45 Huygens 45 MSN# 45 MErcury Surface Space ENvironment 45 ESA SMART 45 GOSAT 45 Dual Frequency 45 Inertial Navigation System 45 EuroHawk 45 Envisat satellites 45 SaM# engine 45 Russian cosmonauts Gennady Padalka 45 INSAT satellites 45 Trimble VRS 45 NASA EPOXI mission 45 electro optical sensor 45 weather satellite TIROS 45 AMIE camera 45 Hubble Space Telescope HST 45 Pad Abort 1 45 SkySat 45 CryoSat 45 GEO satellites 45 APXS 45 Downlink 45 Rockot launcher 45 geosynchronous orbit 45 Vehicle PSLV C# 45 Paulo Nespoli 45 ARTEMIS 45 SSMEs 45 NAVSTAR GPS 45 Mars# 45 Arianespace 45 Navigation Satellite 45 Sensing Satellite LCROSS 45 Rokot 45 Climate Experiment GRACE 45 W3B satellite 45 radars telemetry 45 Garmin GNS 45 CNES 45 Solar Orbiter 45 Geosynchronous Satellite Launch Vehicle 45 XTAR EUR satellite 45 Fucino 45 geosynchronous transfer 45 Chinasat 6B 45 André Kuipers 45 Eutelsat ATLANTIC BIRD TM 45 Foton M3 45 INTELSAT 45 ESA Huygens 45 NAVSTAR Global Positioning System 45 ephemeris 45 TerraSAR X satellite 45 Monics 45 AMPERE 45 SBIRS GEO 45 SES WORLD SKIES NSS 45 GSLV F# 45 Hyperspectral Imager 45 SELEX Galileo 45 ion propulsion 45 Satellite GOES 45 High Resolution Imaging 45 CitySense 45 KazSat 45 Infrared Astronomy SOFIA 45 nEUROn 45 Multibeam 45 SPACEWAY 3 45 payload canister 45 Japanese Aerospace Exploration 45 AXTracker 45 fiber optic gyros 45 Huygens probe 45 Baikonour 45 XTAR 45 SSPTS 45 Satellite Launch Vehicle 45 diplexers 45 Yahsat 1A 45 SBIRS 45 Japanese Kibo laboratory 45 C1XS 45 Space Shuttle Orbiter 45 Orbital Sciences Taurus 45 onboard Chandrayaan 45 Nimiq 45 kg payload 45 NASA GeneSat 1 45 Resourcesat 44 COMSATBw 44 Earth orbiting satellites 44 Inertial Measurement Units 44 Orbiting Carbon Observatory OCO 44 Navstar GPS 44 GSLV D2 44 GPS L2C 44 Y1A 44 ARIANE 44 infrared astronomy 44 downlinked 44 troposcatter communications 44 Tekelec EAGLE 5 44 Atmospheric Infrared Sounder 44 ASPERA 44 SiRFstarIII architecture 44 Ozone Monitoring 44 TDRS 44 Landsat satellite 44 Airborne Laser Testbed 44 DMSP F# 44 Watchkeeper UAV 44 MSS ATC 44 Block IIR 44 earth orbiting satellites 44 Inmarsat BGAN 44 AIRSS 44 ASTRA 5A 44 RazakSAT 44 MEASAT 44 Multi Purpose Logistics 44 High Frequency EHF 44 Soyuz rocket carrying 44 INSAT satellite 44 Mössbauer 44 Japanese Experiment Module 44 KSLV 1 44 Satellite GOSAT 44 System WAAS 44 e GEOS 44 GNSS 44 Rosetta spacecraft 44 INSAT 4C 44 PSLV 44 Near Infrared Camera 44 entire Milstar constellation 44 EADS Astrium 44 Planetary Fourier Spectrometer PFS 44 Mars Color Imager 44 AATSR 44 Earth Observation EO 44 situ measurements 44 uplinked 44 Geosynchronous 44 Leonardo Multi Purpose 44 MEASAT 3a satellite 44 preset orbit 44 entered lunar orbit 44 Atlas 2AS 44 Envisat Advanced Synthetic Aperture 44 RapidEye constellation 44 DC1 Docking Compartment 44 indigenous cryogenic engine 44 GOES R 44 Relative Navigation 44 ELM PS 44 Inertial Measurement Unit 44 Specialist Greg Chamitoff 44 Huygens lander 44 IQ modulator 44 Initial Production LRIP 44 Express AM# 44 Kosmos 3M rocket 44 COROT satellite 44 orbiter Cassini 44 composite payload fairing 44 interferometric 44 AEHF 44 Plesetsk 44 Volker Liebig 44 ARCTUS 44 Globalstar constellation 44 Minotaur rocket 44 Shuttle Radar Topography 44 GSLV Mk III 44 WESCAM 44 X #A Waverider 44 VLBI 44 Exploration Vehicle CEV 44 Rockot launch 44 CoRoT satellite 44 Hispasat 1E 44 Interior Laboratory GRAIL 44 TTNT 44 CryoSat satellite 44 RISAT 44 ESA ESTEC 44 Tranquility module 44 HISPASAT 44 HARPS N 44 ARABSAT 44 Heterodyne Instrument 44 RTK GPS 44 SPDM 44 THEMIS 44 Atlas V 44 Ångström 44 payload fairing 44 Credits ESA 44 P5 truss 44 Geostationary Operational Environmental 44 Kourou 44 scatterometer 44 lidar instrument 44 Optus D3 satellite 44 ActivFlex 44 Nasa spacecraft 44 spacecraft 44 lunar orbiter Chandrayaan 44 Orbital Sciences Corporation 44 SPHERES 44 Faint Object 43 iNetVu ® 43 GNSS receivers 43 Pirs Docking Compartment airlock 43 DART spacecraft 43 GLONASS M 43 ExoMars 43 STP S# 43 scramjet engine 43 Spacecraft Control 43 STSS Demonstration 43 SPICAM 43 orbital insertion 43 SPACEWAY TM 43 shuttle Endeavour STS 43 VRoll 43 Telemetrix R 43 KSLV 43 W2M satellite 43 SOHO spacecraft 43 interplanetary spacecraft 43 ISTRAC 43 CDR SO 43 #/#-ton truss 43 Magnetospheric 43 #Gb s optical 43 ESA 43 BMC2 43 remote sensing satellite Resourcesat 43 Huygens mission 43 ICESat 43 Uninhabited Aerial Vehicle 43 OHB 43 downlinks 43 AMSR E 43 Cassini Huygens 43 Atlantis undocks 43 DIRECTV 7S 43 AEHF satellites 43 orbital maneuvers 43 demodulated 43 #x#G [002] 43 ESMD 43 Differential GPS 43 DGPS 43 laser altimeter 43 Astro E2 43 MESSENGER spacecraft 43 E ELT 43 Lunar Laser Ranging 43 GPS WAAS 43 SES Astra 43 ESA Integral 43 LEAP X1C 43 Optus D3 43 AN/AAQ-# 43 lunar orbit 43 Eutelsat Communications 43 Gaele Winters 43 GLONASS 43 Alcatel Alenia 43 Ariane 5 43 enters lunar orbit 43 Optical Spectroscopic 43 GSLV rocket 43 unmanned Progress 43 SiRFstar 43 ESA CryoSat 43 synthetic aperture radar 43 Launched Successfully 43 NASA Landsat 43 Radar ASAR instrument 43 demodulate 43 NuSTAR 43 OS COMET 43 PW#A 43 LRO spacecraft 43 Navitraq V 43 Baikonur spaceport 43 TACAN 43 protocol conformance 43 WAAS enabled 43 noise ratio OSNR 43 model A# 43 Orbiter MRO 43 KOMPSAT 43 Oberpfaffenhofen 43 WAAS GPS 43 HOT BIRD 43 intelligence SIGINT 43 agency CNES 43 Esrange Space Center 43 Allot NetEnforcer 43 Alenia Spazio 43 XMM Newton 43 probe Chang'e 43 Geosynchronous orbit 43 SUAV 43 RX1 43 Kibo JPM JEM Pressurized 43 GlobalWave 43 Reader DL# [001] 43 NASA THEMIS 43 Ares I. 43 Mission TRMM 43 AMASE 43 satellite INSAT 4CR 43 UKIRT 43 TRACER 43 3Gb s SDI 43 EASy 43 THEMIS satellites 43 Roberto Vittori 43 optical encoder 43 MQ 8B Fire 43 Foton M3 mission 43 Envisat 43 MHz transponders 43 CALIPSO satellites 43 Composite Infrared Spectrometer 43 Glonass satellite 43 OmniSTAR 43 Canadarm2 robotic arm 43 RSC Energia 43 Ares IX rocket 43 Eurockot Launch Services 43 manned spaceships 43 electric ion propulsion 43 datalogger 43 Centaur upper 43 Laboratory MSL 43 Block 5D 43 Model #A 43 Meteorological Satellite 43 Space Shuttle Atlantis 43 Radar G ATOR 43 Simonetta Di Pippo ESA 43 Robotic Arm 43 HIFI 43 NASA MSFC 43 Landsat satellites 43 Interferometer 43 narrowband tactical 42 QuickVue Influenza 42 ILS Proton Breeze 42 Zenit 3SL 42 NFIRE satellite 42 SBAS 42 GALILEO 42 UHF frequencies 42 Breeze KM 42 Digitaltest 42 Chandrayaan 42 ESA ESOC 42 Ariane launchers 42 lunar spacecraft Chandrayaan 42 Barix Exstreamer 42 GLONASS constellation 42 electro magnetically 42 uplink downlink 42 Soyuz launchers 42 Impact Probe MIP 42 inertial sensor 42 GSLV D3 42 JTRS approved 42 Dmitri Kondratyev 42 RS# interface 42 localiser 42 Advanced EHF 42 tunable transmitter 42 aircraft MSN# 42 Asiasat 42 eLORAN 42 geosynchronous satellite launch 42 Hinode spacecraft 42 INTEGRAL 42 airborne observatory 42 INSAT 42 Eyharts 42 electro optic sensors 42 SATEL 42 RSRM 42 Baikonur Kazakhstan 42 VINASAT 1 42 GLONASS satellite 42 RapidCell 42 mooncraft 42 Discovery STS 42 Zvezda module 42 Sacred Vessel 42 piezoelectric sensors 42 Space Agency 42 FORMOSAT 42 NASA Far Ultraviolet 42 heterodyne 42 arbitrary waveform generator 42 Istrac 42 ESA CNES 42 geostationary orbit 42 Cargo Launch Vehicle 42 station Pirs docking 42 X ray observatory 42 flyby spacecraft 42 Orbital Boost 42 ESA Astronaut 42 exoatmospheric kill vehicle 42 SMARTi 3G 42 inertial guidance 42 modules actuators 42 ASTRA 1G 42 Marsis 42 Exploration Vehicle 42 Russian Soyuz Fregat 42 ALOS 42 Operations Centre ESOC 42 bargraph 42 multirate 42 Taurus XL 42 Remote Sensing Satellite 42 Relations Observatory STEREO 42 InSAR 42 Conductivity Analyzer 42 SpaceLoft XL 42 astronauts Hans Schlegel 42 ASTER 42 Cosmic Vision 42 Kepler Mission 42 Telemetry Tracking 42 magnetic spectrometer 42 CMOS Photonics technology 42 MPCV 42 Space Telescope GLAST 42 Kourou French Guiana 42 Surrey Satellite 42 ELINT 42 Kiruna Sweden 42 Simonetta Di Pippo 42 communication satellite GSAT 42 AN/PRC-#G 42 Palapa D 42 Launch Scrubbed 42 satID 42 Readiness Review 42 OmniExpress 42 Trimble GNSS 42 Imaging Spectrometer 42 SRON 42 Titan flyby 42 Swift# 42 Compact FieldPoint 42 LCROSS Observation Campaign 42 Lasing Teams COLT 42 TWT amplifiers 42 twin STEREO spacecraft 42 Hellas Sat 42 Mars CRISM 42 datalink 42 Wallops Island Va. 42 Bit Error Rate 42 JCTD 42 FlexWave Prism 42 Hubble Space telescope 42 cryocoolers 42 WebTAS 42 ASTRON 42 gamma ray observatory 42 CIXS 42 Shepherding Spacecraft 42 GMDSS 42 Spacecraft Operations 42 De Winne 42 Observatory SDO 42 Phased array 42 Reusable Launch Vehicle 42 Landsat Data Continuity 42 terrestrial transmitters 42 Servicing Mission 42 GMTI 42 downlinked via 42 Array ALMA 42 ANTRIX 42 wavebands 42 quadrature modulators 41 MEMS Inertial 41 geo synchronous satellite 41 subcarrier 41 propellant tanks 41 spacecraft Chandrayaan 1 41 broadband subsidiary Skylogic 41 MADL 41 Global Positioning Satellites 41 lunar probe Chang'e 41 demodulating 41 Cassini Huygens spacecraft 41 sampling oscilloscopes 41 command network Istrac 41 Spatiales CNES 41 geosynchronous orbit GEO 41 Anik F2 satellite 41 Frascati Italy 41 Envisat satellite 41 thrust vector 41 ESA XMM Newton 41 highly elliptical orbit 41 STEREO spacecraft 41 RapidEye AG 41 troposcatter