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Explorer S-45A (satellite)

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American ionosphere research satellite

Explorer S-45A
Explorer S-45A satellite before launch
NamesS-45A
NASA S-45A
Mission typeIonosphere research
OperatorNASA
COSPAR IDEXS-451
Mission durationFailed to orbit
Spacecraft properties
SpacecraftExplorer S-45A
Spacecraft typeScience Explorer
BusS-45
ManufacturerGoddard Space Flight Center
Launch mass33.6 kg (74 lb)
PowerSolar cells and batteries
Start of mission
Launch date24 May 1961, 19:48:05 GMT
RocketJuno II (AM-19G)
Launch siteCape Canaveral, LC-26B
ContractorArmy Ballistic Missile Agency
End of mission
DestroyedFailed to orbit
Orbital parameters
Reference systemGeocentric orbit (planned)
RegimeHighly elliptical orbit
Perigee altitude221 km (137 mi)
Apogee altitude181,100 km (112,500 mi)
Inclination33.0°
Period5013.90 minutes
Instruments
Beacon
Explorer program← Explorer 11Explorer S-55 →

Explorer S-45A was a NASA satellite, which was lost in a launch failure in 1961. The satellite was intended to operate in a highly elliptical orbit, from which it was to have provided data on the shape of the ionosphere, and on the Earth's magnetic field. It was part of the Explorer program and would have been designated Explorer 12 had it reached orbit. It was the second of two identical satellites to be launched; the first, Explorer S-45, had also been lost in a launch failure, earlier in the year.

Launch

Explorer S-45A was launched aboard a Juno II launch vehicle, serial number AM-19G. It was the final flight of the Juno II. The launch took place from LC-26B at the Cape Canaveral Air Force Station (CCAFS) at 19:48:05 GMT on 24 May 1961. The system which was intended to ignite the second stage malfunctioned, and as a result that stage failed to ignite. The launch vehicle failed to achieve orbit.

References

  1. "Explorer S-45A". NASA. 28 October 2021. Retrieved 4 November 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ^ Wade, Mark. "P-14". Encyclopedia Astronautica. Archived from the original on 13 June 2010. Retrieved 4 November 2021.
  3. ^ McDowell, Jonathan (21 July 2021). "Launch Log". Jonathan's Space Page. Retrieved 4 November 2021.
  4. Krebs, Gunter. "Explorer: S-45". Gunter's Space Page. Retrieved 4 November 2021.
  5. "Explorer Program". Mission and Spacecraft Library. NASA. Archived from the original on 27 January 2008. Retrieved 14 July 2010. Public Domain This article incorporates text from this source, which is in the public domain.
Explorers Program
List of Explorers Program missions
Missions
1958–1992
MIDEX
SMEX
UNEX/MO/I
Proposals
Proposals
  • Green titles indicates active current missions
  • Grey titles indicates cancelled missions
  • Italics indicate missions yet to launch
  • Symbol indicates failure en route or before intended mission data returned
← 1960Orbital launches in 19611962 →
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).
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