|Mission type||Experimental, Earth Observation|
|Mission duration||Elapsed: 19 years, 6 months|
|Manufacturer||QinetiQ Space (previously Verhaert Space)|
|Launch mass||94 kilograms (207 lb)|
|Dry mass||94 kilograms (207 lb)|
|Dimensions||0.6 by 0.6 by 0.8 metres (2 ft 0 in × 2 ft 0 in × 2 ft 7 in)|
|Start of mission|
|Launch date||04:53, October 22, 2001 (UTC)|
|Launch site||Sriharikota FLP|
|Perigee altitude||553 kilometres (344 mi)|
|Apogee altitude||677 kilometres (421 mi)|
|Epoch||22 October 2001 00:53:00 UTC|
PROBA (Project for On-Board Autonomy), renamed PROBA-1, is a Belgian satellite launched atop an Indian Polar Satellite Launch Vehicle by ISRO on 22 October 2001. The satellite was funded through the ESA's MicroSat program. This small (60×60×80 cm; 95 kg) boxlike system, with solar panel collectors on its surface, has remarkable image-making qualities. It hosts two Earth Observation instruments dubbed CHRIS and HRC. It is a hyperspectral system (200 narrow bands) that image at 30 m, plus three in the visible that have 15 m resolution.
With an initial lifetime of 1 to 2 years, the satellite celebrated its 16th year of operations in 2017. On 9 March 2018, it surpassed ERS-2 as ESA's longest operated Earth observation mission of all time.
PROBA is also the name of the series of satellites starting with PROBA-1. The name is also used to refer to the bus of the satellites.
The third satellite to be launched was PROBA-V (PROBA-Vegetation), on 7 May 2013.