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- Navstar_7 abstract "Navstar 7, also known as GPS I-7 and GPS SVN-7, was an American navigation satellite which was lost in a launch failure in 1981. It was intended to be used in the Global Positioning System development programme. It was the seventh of eleven Block I GPS satellites to be launched, and the only one to fail to achieve orbit.Navstar 7 was launched at 01:10 UTC on 19 December 1981, atop an Atlas E/F carrier rocket with an SGS-1 upper stage. The Atlas used had the serial number 76E, and was originally built as an Atlas E. The launch took place from Space Launch Complex 3E at Vandenberg Air Force Base.During preparations for launch, a seal on the number B2 engine of the MA-3 booster section of the Atlas was replaced. Sealant from this seeped into three coolant holes, plugging them. Four seconds after liftoff, the engine overheated and burned through its gas generator, severing an oxidiser line. Within seven and a half seconds of launch the engine lost thrust, causing the rocket to pitch out of control. It was destroyed by range safety, with debris landing within 150 metres (490 ft) of the launch pad, less than twenty seconds after liftoff.If the launch had been successful, it would have placed Navstar 7 into a transfer orbit, from which the satellite would have raised itself into medium Earth orbit by means of a Star-27 apogee motor. The spacecraft had a design life of 5 years and a mass of 758 kilograms (1,671 lb).".
- Navstar_7 wikiPageID "36401885".
- Navstar_7 wikiPageRevisionID "588597617".
- Navstar_7 apsis "gee".
- Navstar_7 hasPhotoCollection Navstar_7.
- Navstar_7 launchDate "--12-19".
- Navstar_7 launchRocket "76".
- Navstar_7 launchSite Vandenberg_AFB_Space_Launch_Complex_3.
- Navstar_7 launchSite Vandenberg_Air_Force_Base.
- Navstar_7 manufacturer Rockwell_International.
- Navstar_7 missionDuration "(Failed to orbit)".
- Navstar_7 missionDuration "1.57788E8".
- Navstar_7 missionType Satellite_navigation.
- Navstar_7 missionType "Technology".
- Navstar_7 name "Navstar 7".
- Navstar_7 operator United_States_Air_Force.
- Navstar_7 orbitEpoch "Planned".
- Navstar_7 orbitPeriod "43200.0".
- Navstar_7 orbitReference Geocentric_orbit.
- Navstar_7 orbitRegime Medium_Earth_orbit.
- Navstar_7 spacecraftType GPS_(satellite).
- Navstar_7 subject Category:GPS_satellites.
- Navstar_7 subject Category:Satellite_launch_failures.
- Navstar_7 subject Category:Spacecraft_launched_in_1981.
- Navstar_7 type ArtificialSatellite.
- Navstar_7 type Satellite.
- Navstar_7 type Thing.
- Navstar_7 comment "Navstar 7, also known as GPS I-7 and GPS SVN-7, was an American navigation satellite which was lost in a launch failure in 1981. It was intended to be used in the Global Positioning System development programme. It was the seventh of eleven Block I GPS satellites to be launched, and the only one to fail to achieve orbit.Navstar 7 was launched at 01:10 UTC on 19 December 1981, atop an Atlas E/F carrier rocket with an SGS-1 upper stage.".
- Navstar_7 label "Navstar 7".
- Navstar_7 label "Navstar 7".
- Navstar_7 sameAs Navstar_7.
- Navstar_7 sameAs m.0k7_0tl.
- Navstar_7 sameAs Q6982574.
- Navstar_7 sameAs Q6982574.
- Navstar_7 wasDerivedFrom Navstar_7?oldid=588597617.
- Navstar_7 isPrimaryTopicOf Navstar_7.