Disassembled View of Mars Orbiter Spacecraft from ISRO

Indeed this is very interesting to know the internals of a spacecraft! Here we go:

The spacecraft configuration is a balanced mix of design from flight proven IRS/INSAT/Chandrayaan-1 bus. Modifications required for Mars mission aremars-orbiter-dis-assembled in the areas of Communication, Power, Propulsion systems (mainly related to Liquid Engine restart after nearly 10 months) and on-board autonomy.

  • 390 litres capacity propellant tanks accomodate a maximum of 852 kg of propellant which is adequate with sufficient margins.
  • A Liquid Engine of 440 N thrust is used for orbit raising and insertion in Martian Orbit.
  • The spacecraft requires three solar panels (size 1800 X 1400 mm) to compensate for the lower solar irradiance.
  • Antenna System consists of Low Gain Antenna (LGA), Medium Gain Antenna (MGA), and High Gain Antenna (HGA). The High Gain Antenna system is based on a single 2.2 meter reflector illuminated by a feed at S-band. It is used to transmit/receive the Telemetry, Tracking and Commanding (TTC) and data to/from the Indian Deep Space Network
  • On-board autonomy functions are incorporated as the large distance does not permit real time interventions.
Lift-off Mass 1337 kg
Structures Aluminum and Composite Fiber Reinforced Plastic (CFRP) sandwich construction-
modified I-1 K Bus
Mechanism Solar Panel Drive Mechanism (SPDM), Reflector & Solar panel deployment
Propulsion Bi propellant system (MMH + N2O4) with additional safety and redundancy features for MOI. Proplellant mass:852 kg
Thermal System Passive thermal control system
Power System Single Solar Array-1.8m X 1.4 m – 3 panels – 840 W Generation (in Martian orbit), Battery:36AH Li-ion
Attitude and Orbit Control System AOCE (Attitude and Orbit Control Electronics): with MAR31750 ProcessorSensors: Star sensor (2Nos), Solar Panel Sun Sensor (1No), Coarse Analogue Sun SensorActuators: Reaction Wheels (4Nos), Thrusters (8Nos), 440N Liquid Engine
Antennae Low Gain Antenna (LGA), Mid Gain Antenna (MGA) and High Gain Antenna (HGA)
Launch Date Nov 05, 2013
Launch Site SDSC SHAR Centre, Sriharikota, India
Launch Vehicle PSLV – C25

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