|Mission duration||2 years, 3 months|
|Launch mass||350 kilograms (770 lb)|
|Start of mission|
|Launch date||19 June 1981|
|Launch site||Kourou ELA-1|
|End of mission|
|Deactivated||19 September 1983|
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 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.
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
|Mission||Experimental geostationary communication|
|Onboard Power||210 watts|
|Payload||C-band transponders (Two)|
|Launch Date||June 19, 1981|
|Launch Vehicle||Ariane -1(V-3)|
|Mission life||Two years|