EOS–07 (formerly known as Microsat-2B) was an

Earth observation satellite An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation (EO) from orbit, including spy satellites and similar ones intended for non-military uses such as environmental monitoring, me ...

developed by the

Indian Space Research Organisation The Indian Space Research Organisation (ISRO ) is India's national List of government space agencies, space agency, headquartered in Bengaluru, Karnataka. It serves as the principal research and development arm of the Department of Space (DoS), ...

(ISRO) and launched during the SSLV-D2 mission, the first successful mission of the

SSLV The Small Satellite Launch Vehicle (SSLV) is a small-lift launch vehicle developed by the ISRO, Indian Space Research Organisation (ISRO) to deliver payload to low Earth orbit () or payload to Sun-synchronous orbit (). The rocket supports mu ...

rocket. It's a minisatellite designed to accommodate new technology payloads in a quick turnaround time.

Structure and Payloads

It has a cubical structure consisting of six Honeycomb structures. The top and Bottom decks are connected with 4 staggered cross ribs and 4 closing vertical decks. The structure includes a Starsensor (mSS), 4π Sunsensor (4πSS), a micro-Inertial Reference Unit (mIRU), and a

Magnetometer A magnetometer is a device that measures magnetic field or magnetic dipole moment. Different types of magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location. A compass is one such device, ...

. It has a passive thermal control system with Optical Solar Reflector, Multi-Layer Insulation, Thermal interface material, etc. It has 1N Thrusters (1Nms), 0.02Nm Reaction Wheels, and 20 A.m2 Magnetic Torquers powered by 5 kg of hydrazine fuel. The altitude and orbital control system (AOCS) has a pointing accuracy of – 0.1° (3σ) and a drift rate of – 7.5e-4°/s. For power generation, it has solar panels that will be deployed using Frangi bolt actuators. The panels have a power generation of 357 watts. It also has a Li-ion battery of 27.2 Ah capacity. The onboard computer has a MIL STD 1553B protocol for interfacing with other subsystems. It has a data storage capacity of 32 GB. The RF system uses S-Band Telemetry Transmitters, S-Band Telecommand Receiver, and 12-channel SPS. It has a 15m location accuracy, 0.15 m/s velocity accuracy and an X-Band Data Transmitter.

Payloads

It has two payloads; the mmWave Humidity Sounder (MHS) and a Spectrum Monitoring Payload. MHS has 6 water vapor sounding channels with 50rpm scan rate. It weighs 26 kg and requires 55 watts power. The Spectrum Monitoring Payload weighs 13 kg, requires a power~ of 35W, and has a data rate of 2 Mbit/s.

Orbital Decay

During a massive

Solar Storm A solar storm is a disturbance on the Sun, which can emanate outward across the heliosphere, affecting the entire Solar System, including Earth and its magnetosphere, and is the cause of space weather in the short-term with long-term patterns compr ...

in May 2024, EOS-07 had a higher than normal decay observed at 600 meters, as compared to 300 for regular operations. The spacecraft used its onboard engines to make up the shortfall. The spacecraft was decommissioned and underwent orbital decay in late 2024 following completion of all planned mission objectives.

References

{{Indian spacecraft Earth observation satellites of India