PROBA is minisatellite technology demonstration mission in ESA's General Study Program with the objective to address issues of on-board operational autonomy of a generic platform. [1]

Mission typeExperimental, Earth Observation
COSPAR ID2001-049B Edit this at Wikidata
SATCAT no.26958
WebsiteProba-1 applications
Mission durationElapsed: 21 years, 2 months, 20 days
Spacecraft properties
ManufacturerQinetiQ Space (previously Verhaert Space)
Launch mass94 kg (207 lb)
Dry mass94 kg (207 lb)
Dimensions0.6 m × 0.6 m × 0.8 m (2 ft 0 in × 2 ft 0 in × 2 ft 7 in)
Power90 W
Start of mission
Launch date04:53, 22 October 2001 (UTC) (2001-10-22T04:53Z)
RocketPSLV C3
Launch siteSriharikota FLP
Orbital parameters
Reference systemGeocentric
Perigee altitude553 km (344 mi)
Apogee altitude677 km (421 mi)
Inclination97.9 degrees
Period97 minutes
Epoch22 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.[2][3] The satellite was funded through the ESA's MicroSat program.[4] 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. CHRIS is a hyperspectral system (200 narrow bands) that images at 17 m resolution, while HRC is a monochromatic camera that images visible light at 5 m resolution.[5]

With an initial lifetime of one to two years, the satellite celebrated its 20th year of operations in 2021.[5] On 9 March 2018, it surpassed ERS-2 as ESA's longest operated Earth observation mission of all time.[6]

Series of satellites

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 second satellite in the PROBA series, PROBA-2, was launched on 2 November 2009 together with the SMOS satellite.

The third satellite to be launched was PROBA-V (PROBA-Vegetation), on 7 May 2013.

Further planned satellites in the PROBA series include the formation flying demonstration mission PROBA-3 and limb sounder ALTIUS.

See also


  1. ^ "PROBA-1 (Project for On-Board Autonomy - 1)". Retrieved 2022-12-28.
  2. ^ Ramakrishnan, S.; Somanath, S.; Balakrishnan, S. S. (January 2002). "Multi-Orbit Mission by PSLV-C3 and Future Launch Opportunities". IAF Abstracts: 936. Bibcode:2002iaf..confE.936R.
  3. ^ "PSLV-C3". ISRO. 22 October 2001. Archived from the original on 25 March 2014. Retrieved 25 October 2021.
  4. ^ "PROBA-1 - Overview". ESA. 11 December 2012. Retrieved 25 October 2021.
  5. ^ a b "Proba-1 Celebrates 20th Birthday In Orbit". ESA. 22 October 2021. Retrieved 25 October 2021.
  6. ^ "Proba-1 sets new record". ESA. 8 March 2018. Retrieved 11 March 2018.