Table 1: INTEGRAL - main facts and figures (see also Fig. 2).
Objective Fine imaging and spectroscopy of celestial gamma-ray sources in the energy range 15 keV to 10 MeV
Instruments  
Imager IBIS 15 keV-10 MeV, coded aperture mask, 16483 CdTe dets, each (4$~\times~$4$~\times~$2) mm, 4096 CsI dets, each (8.4$~\times~$8.4$~\times~$30) mm
Spectrometer SPI 18 keV-8 MeV, coded aperture mask, 19 Ge dets, each (6$~\times~$7) cm, cooled @ 85K
X-ray Monitor JEM-X 4 keV-35 keV, coded aperture mask, micro-strip detector (2$~\times~$), (each Ø250 mm) Xe/CH4 gas
Optical Monitor OMC V-band (500-600 nm), CCD detector, refractive optics

Launch Vehicle

 Proton with Block DM upper stage. Launch from Baikonur/Kazakhstan

Operational orbit

 Apogee height: 153 657 km
(as achieved on Perigee height: 9050 km
01 Nov 2002) Inclination: 52.2$^{\circ }$
  Argument of perigee: 302$^{\circ }$
  RA ascending node: 103$^{\circ }$
  Period 3 days
  Max eclipse duration: 1.2 h

Ground stations

 Redu (Belgium) and Goldstone (California)
  Coverage 100% above 40 000 km

Lifetime

 2.2 years nominal 5.2 years extended
Dimensions Satellite body dimension : (2.8$~\times~$3.2$~\times~$5) m
  Solar array span 16 m

Mass

 Total mass: 3954 kg
  Dry mass: 3414 kg
  Fuel (hydrazine, at launch): 540 kg
  Instrument mass 2013 kg

Power/Energy Storage

 28 V regulated power bus
  Advanced Rigid Solar Arrays, Silicon cells.
  @ launch (@ 2.2 years): 2377 W (1960 W), Sun aspect angle: 0$^{\circ }$
  @ launch (@ 2.2 years): 1834 W (1630 W), Sun aspect angle: 40$^{\circ }$
  Two 24 Ah NiCd rechargeable batteries

Communication

 S-band up and down link, 2 fixed antennae
  Telemetry rate: 113 kbps (payload: 108 kbps)
  Telecommand rate: 2 kbps

Mechanical Properties

 First axial mode: $\geq$38 Hz
  First lateral mode: $\geq$12 Hz
  Load case 1: $\pm$9 g longitudinal, $\pm$1.5 g lateral
  Load case 2: $\pm$0 g longitudinal, $\pm$4.5 g lateral

Pointing and alignment

 3-axes stabilised spacecraft (instrument pointing axis: +X, Sun pointing: +Z)
(as specified) Absolute pointing error: 5$^{\prime }$ (Y, Z), 15$^{\prime }$ (X)
  Instrument alignment: 1$^{\prime }$ (Y, Z), 3$^{\prime }$ (X)


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