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- Explorer_9 abstract "Explorer 9, known as S-56A before launch, was an American satellite which was launched in 1961 to study the density and composition of the upper thermosphere and lower exosphere. It was a reflight of the failed S-56 mission, and consisted of a 7-kilogram (15 lb), 3.7-meter (12 ft) balloon which was deployed into a medium Earth orbit. The mission was conducted by NASA's Langley Research Center.Explorer 9 was launched from Launch Area 3 at the Wallops Flight Center, atop a Scout X-1 rocket with the serial number ST-4. It was the first spacecraft launched from Wallops Island to achieve orbit, with one previous attempt having failed. The launch occurred at 13:05:00 UTC on 16 February 1961, and resulted in Explorer 9 being deployed into an orbit with an apogee of 2,581 kilometres (1,604 mi), a perigee of 635 kilometres (395 mi), 38.8 degrees of inclination and a period of 118.4 minutes. It was assigned the Harvard designation 1961 Delta 1.The second of six identical air density research satellites to be launched, Explorer 9 was the first to successfully reach orbit. It was still operational when the next satellite, Explorer 19, was launched, allowing simultaneous readings to be taken and compared. The spacecraft consisted of alternating layers of aluminium foil and Mylar polyester film. Uniformly distributed over the aluminium surface were 5.1 cm-diameter dots of white paint for thermal control. The sphere was packed in a tube 21.6 cm in diameter and 48.3 cm long and mounted in the nose of the fourth stage of the launch vehicle. Upon separation of the fourth stage, the sphere was inflated by a nitrogen gas bottle, and a separation spring ejected it out into its own orbit. The two hemispheres of aluminium foil were separated with a gap of Mylar at the spacecraft's equator and served as the antenna. A 136 MHz, 15 mW beacon was carried for tracking purposes, but the beacon failed on the first orbit and the SAO Baker-Nunn camera network had to be relied upon for tracking. Power was supplied by solar cells and rechargeable batteries It decayed from orbit on 9 April 1964.".
- Explorer_9 thumbnail Explorer_9.jpg?width=300.
- Explorer_9 wikiPageID "27742606".
- Explorer_9 wikiPageLength "4787".
- Explorer_9 wikiPageOutDegree "31".
- Explorer_9 wikiPageRevisionID "699209872".
- Explorer_9 wikiPageWikiLink Aluminium_foil.
- Explorer_9 wikiPageWikiLink Apsis.
- Explorer_9 wikiPageWikiLink BoPET.
- Explorer_9 wikiPageWikiLink Category:Explorers_program_(NASA).
- Explorer_9 wikiPageWikiLink Category:Passive_satellites.
- Explorer_9 wikiPageWikiLink Category:Spacecraft_launched_in_1961.
- Explorer_9 wikiPageWikiLink Category:Spacecraft_which_reentered_in_1964.
- Explorer_9 wikiPageWikiLink Density_of_air.
- Explorer_9 wikiPageWikiLink Exosphere.
- Explorer_9 wikiPageWikiLink Explorer_19.
- Explorer_9 wikiPageWikiLink Geocentric_orbit.
- Explorer_9 wikiPageWikiLink Harvard_designation.
- Explorer_9 wikiPageWikiLink Langley_Research_Center.
- Explorer_9 wikiPageWikiLink Medium_Earth_orbit.
- Explorer_9 wikiPageWikiLink NASA.
- Explorer_9 wikiPageWikiLink Orbital_inclination.
- Explorer_9 wikiPageWikiLink Polyester.
- Explorer_9 wikiPageWikiLink S-56_(satellite).
- Explorer_9 wikiPageWikiLink Scout_X-1.
- Explorer_9 wikiPageWikiLink Thermosphere.
- Explorer_9 wikiPageWikiLink United_States.
- Explorer_9 wikiPageWikiLink Wallops_Flight_Facility.
- Explorer_9 wikiPageWikiLink Wallops_Flight_Facility_Launch_Area_3.
- Explorer_9 wikiPageWikiLink File:Scout_X-1_with_Explorer_9_Feb_16_1961.JPG.
- Explorer_9 wikiPageWikiLinkText "Explorer 9".
- Explorer_9 wikiPageWikiLinkText "Explorer IX".
- Explorer_9 wikiPageWikiLinkText "Explorer S-56".
- Explorer_9 apsis "gee".
- Explorer_9 decayDate "1964-04-09".
- Explorer_9 harvardDesignation "1961".
- Explorer_9 imageCaption "Explorer 9 before launch".
- Explorer_9 launchDate "--02-16".
- Explorer_9 launchRocket "Scout X-1 ST-4".
- Explorer_9 launchSite Wallops_Flight_Facility.
- Explorer_9 launchSite Wallops_Flight_Facility_Launch_Area_3.
- Explorer_9 missionType Density_of_air.
- Explorer_9 name "Explorer 9".
- Explorer_9 operator NASA.
- Explorer_9 orbitInclination "38.8".
- Explorer_9 orbitPeriod "7104.0".
- Explorer_9 orbitReference Geocentric_orbit.
- Explorer_9 orbitRegime Medium_Earth_orbit.
- Explorer_9 satcat "81".
- Explorer_9 wikiPageUsesTemplate Template:Convert.
- Explorer_9 wikiPageUsesTemplate Template:End-date.
- Explorer_9 wikiPageUsesTemplate Template:Explorer_program.
- Explorer_9 wikiPageUsesTemplate Template:Infobox_spaceflight.
- Explorer_9 wikiPageUsesTemplate Template:No_epoch.
- Explorer_9 wikiPageUsesTemplate Template:Orbital_launches_in_1961.
- Explorer_9 wikiPageUsesTemplate Template:Reflist.
- Explorer_9 wikiPageUsesTemplate Template:Start-date.
- Explorer_9 wikiPageUsesTemplate Template:US-spacecraft-stub.
- Explorer_9 wikiPageUsesTemplate Template:Use_American_English.
- Explorer_9 subject Category:Explorers_program_(NASA).
- Explorer_9 subject Category:Passive_satellites.
- Explorer_9 subject Category:Spacecraft_launched_in_1961.
- Explorer_9 subject Category:Spacecraft_which_reentered_in_1964.
- Explorer_9 hypernym Satellite.
- Explorer_9 type ArtificialSatellite.
- Explorer_9 type CelestialBody.
- Explorer_9 type Place.
- Explorer_9 type Satellite.
- Explorer_9 type Probe.
- Explorer_9 type Program.
- Explorer_9 type Location.
- Explorer_9 type Place.
- Explorer_9 type Thing.
- Explorer_9 comment "Explorer 9, known as S-56A before launch, was an American satellite which was launched in 1961 to study the density and composition of the upper thermosphere and lower exosphere. It was a reflight of the failed S-56 mission, and consisted of a 7-kilogram (15 lb), 3.7-meter (12 ft) balloon which was deployed into a medium Earth orbit.".
- Explorer_9 label "Explorer 9".
- Explorer_9 sameAs Q49897.
- Explorer_9 sameAs Explorer_9.
- Explorer_9 sameAs Explorer_9.
- Explorer_9 sameAs Explorer_9.
- Explorer_9 sameAs エクスプローラー9号.
- Explorer_9 sameAs Explorer_9.
- Explorer_9 sameAs Explorer_9.
- Explorer_9 sameAs m.0cc8pz7.
- Explorer_9 sameAs Explorer_9.
- Explorer_9 sameAs Q49897.
- Explorer_9 wasDerivedFrom Explorer_9?oldid=699209872.
- Explorer_9 depiction Explorer_9.jpg.
- Explorer_9 isPrimaryTopicOf Explorer_9.