Facts and figures

10 ΟΚΤ. 2002 4940

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

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

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

9 Ah Li-Ion battery

Passive thermal-control system

1 Mbit/s S-band downlink

4 kbit/s uplink

1.2 Gbit data storage

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