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Explorer 11 information


Explorer 11
Explorer-11 satellite
NamesS-15
NASA S-15
Mission typeGamma-ray astronomy
OperatorNASA
Harvard designation1961 Nu 1
COSPAR ID1961-013A Edit this at Wikidata
SATCAT no.00107
WebsiteExplorer 11 at GSFC
Mission duration6 months and 20 days
Spacecraft properties
SpacecraftExplorer XI
Spacecraft typeScience Explorer
BusS-15
ManufacturerGoddard Space Flight Center
Launch mass37.2 kg (82 lb) [1]
Start of mission
Launch date27 April 1961, 14:16:38 GMT
RocketJuno II (AM-19E)
Launch siteCape Canaveral, LC-26B
ContractorArmy Ballistic Missile Agency
Entered service27 April 1961
End of mission
Last contact17 November 1961
Orbital parameters
Reference systemGeocentric orbit[2]
RegimeLow Earth orbit
Perigee altitude486 km (302 mi)
Apogee altitude1,786 km (1,110 mi)
Inclination28.90°
Period108.10 minutes
Instruments
Crystal Sandwich / Cherenkov Counter
Phoswich-Cherenkov Counter Telescope
Explorer program
← Explorer 10
Explorer S-45A →
 

Explorer 11 (also known as S-15) was a NASA satellite that carried the first space-borne gamma-ray telescope. This marked the beginning of space gamma-ray astronomy. Launched on 27 April 1961 by a Juno II, the satellite returned data until 17 November 1961, when power supply problems ended the science mission. During the spacecraft's seven-month lifespan it detected twenty-two events from gamma-rays and approximately 22,000 events from cosmic radiation.

  1. ^ "Explorer 11". NASA.
  2. ^ "Explorer 11". NASA. 28 October 2021. Retrieved 4 November 2021. Public Domain This article incorporates text from this source, which is in the public domain.

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