Engineering:Ariane Passenger Payload Experiment

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Ariane Passenger Payload Experiment
Mission typeCommunications
OperatorEADS Astrium
Mission duration2 years, 3 months
Spacecraft properties
ManufacturerIndia ISRO
Launch mass350 kilograms (770 lb)
Start of mission
Launch date19 June 1981 (1981-06-19)
RocketAriane 1
Launch siteKourou ELA-1
End of mission
Deactivated19 September 1983 (1983-09-20)
Orbital parameters
Reference systemGeocentric
RegimeGeostationary
Longitude102° East
 

The Ariane Passenger PayLoad Experiment (APPLE), was an experimental communication satellite with a C-Band transponder launched by the Indian Space Research Organisation on June 19, 1981, by Ariane, a launch vehicle of the European Space Agency (ESA) from Centre Spatial Guyanais near Kourou in French Guiana.

APPLE was India 's first three-axis stabilised experimental Geostationary communication satellite. On July 16, 1981, the satellite was positioned at 102° E longitude. The 672 kg[1] satellite served as testbed of the Indian telecommunications space relay infrastructure despite the failure of one solar panel to deploy. Solid-propellant based Apogee Boost Motor to circularize APPLE's orbit was derived from SLV-3 fourth stage.[2]

It was used in several communication experiments including relay of TV programmes and radio networking. It was a cylindrical spacecraft measuring 1.2 m in diameter and 1.2 m high. Its payload consisted of two 6/4 GHz transponders connected to a 0.9 m diameter parabolic antenna. It went out of service on September 19, 1983. R. M. Vasagam was the project director of APPLE during 1977-1983.[3][4]

APPLE (Specifications)
Mission Experimental geostationary communication[5]
Weight 670 kg[5]
Onboard Power 210 watts[5]
Payload C-band transponders (Two)[5]
Launch Date June 19, 1981[5]
Launch Vehicle Ariane -1(V-3)[5]
Orbit Geosynchronous[5]
Mission life Two years[5]

See also

References

  1. ↑ "ISRO success stories". THE HINDU. 28 April 2001. http://www.frontlineonnet.com/fl1809/18090180.htm. ...This important opportunity was utilised to build indigenously a 672-kg state-of-the-art three-axis-stabilised (as against the spin-stabilised Aryabhata) geosynchronous communication satellite called APPLE – Ariane Passenger Payload Experiment – which was launched in June 1981.
  2. ↑ Raj, N. Gopal (2014-09-10). "Trusty engine on Mars Orbiter to be tested yet again" (in en-IN). The Hindu. ISSN 0971-751X. https://www.thehindu.com/sci-tech/science/trusty-engine-on-mars-orbiter-to-be-tested-yet-again/article6398003.ece. 
  3. ↑ "Biodata RM Vasagam". https://www.bitmesra.ac.in/UploadedDocuments/pratyush_869/NewsUPloaded/Newscc467ba1512949a3a5b1af2b58e4e770_RM_Vasagam_PADMASHRI.pdf. 
  4. ↑ From fishing hamlet to red planet. Harper Collins. 2015. ISBN 9789351776895. https://www.isro.gov.in/sites/default/files/article-files/node/4548/apple_pdf.pdf. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 "Welcome To ISRO :: Satellites :: Geo-Stationary Satellite :: APPLE". Isro.org. 1981-06-19. http://www.isro.org/satellites/apple.aspx. 




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