Ariane_Passenger_Payload_Experiment

Ariane Passenger Payload Experiment

Ariane Passenger Payload Experiment

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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.

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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)
MissionExperimental geostationary communication[5]
Weight670 kg[5]
Onboard Power210 watts[5]
PayloadC-band transponders (Two)[5]
Launch DateJune 19, 1981[5]
Launch VehicleAriane -1(V-3)[5]
OrbitGeosynchronous[5]
Mission lifeTwo years[5]

See also

References

  1. [1]
    "ISRO success stories". THE HINDU. 28 April 2001. Archived from the original on 17 October 2006. Retrieved 2013-03-17....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. [2]
    Raj, N. Gopal (2014-09-10). "Trusty engine on Mars Orbiter to be tested yet again". The Hindu. ISSN 0971-751X. Retrieved 2021-04-24.
  3. [3]
    "Biodata RM Vasagam" (PDF). BIT Mesra. Retrieved 4 August 2020.
  4. [4]
    From fishing hamlet to red planet (PDF). Harper Collins. 2015. ISBN 9789351776895. Archived from the original (PDF) on 24 April 2021.
  5. [5]
    "Welcome To ISRO :: Satellites :: Geo-Stationary Satellite :: APPLE". Isro.org. 1981-06-19. Retrieved 2013-03-17.


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