Facts and figures   Proba liftoff onboard PSLV     Mission   Launch date 22 October 2001 Launch site Sriharikota, India Launcher Antrix/ISRO PSLV-C3 Orbit LEO Sun-synchronous Orbital parameters 681x561 km Orbital plane inclination 97.9 degrees Orbital period 96.97 minutes Mission duration One year (planned) Number of instruments Eight Number of technological payloads Six Mission operations and ground station ESA/REDU dedicated 2.4 m dish, average of 4 contacts of 10 m/day, automated evening & weekend passes         Proba PFM during vibration tests     Spacecraft   Spacecraft mass 94 kg Instrument mass 25 kg Technological payload mass 30 kg Shape 60x60x80 cm box shaped aluminium honeycomb structure     Proba-1 platform features   Computing system (highest performance computing system yet flown on an ESA spacecraft) ERC-32 (SPARC V7) processor, >80 krad, 10 MIPS, 2 MFLOPS TCS 21 020 digital signal processor, >100 krad, 15 MIPS, 45 MFLOPS 12 other processors in subsystems/payload off-the-shelf operating system (Vx Works) full automatic code generation of all attitude control and navigation software (~50 000 lines of code) 3-axis stabilisation (Earth pointing or inertial) by four miniaturised reaction wheels absolute pointing accuracy: 150 arcsec relative pointing stability: 10 arcsec over 10 s 2-headed star tracker providing arcsec level pointing knowledge         Sriharikota, India - CHRIS image - 8 February 2002   GPS sensor providing 20 m position and fly-by knowledge Spacecraft agility (along- and across-track), enabling multiple payload imaging (typically 5) of the same target in the same pass Slew rate: up to 1 deg/s Autonomous navigation via GPS and orbit propagation (no propulsion) GaAs solar cells on five structure faces 120 W peak 17 W in safe mode 28 Vdc regulated power bus         Mauna Kea volcano, Hawaii - CHRIS image - 15 April 2002   9 Ah Li-Ion battery Passive thermal-control system 1 Mbit/s S-band downlink 4 kbit/s uplink 1.2 Gbit data storage       Last update: 27 May 2009 In depth  •  Third Party Missions: Proba-1 (http://earth.esa.int/missions/thirdpartymission/proba.html)  •  Observing the Earth (http://www.esa.int/esaEO/index.html)  •  Space Engineering (http://www.esa.int/SPECIALS/Space_Engineering/index.html) Related links  •  Indian Space Research Organisation (http://www.isro.org/)  •  Polar Satellite Launch Vehicle (http://www.isro.org/pslv.htm)