EOS–07 explained

EOS-07
Names List:EOS-07 / Microsat-2B
Mission Type:Earth observation
Operator:ISRO
Cospar Id:2023-019A
Satcat:55562
Website:https://www.isro.gov.in/
Mission Duration:Planned: ≈1 year
Elapsed:
Spacecraft:EOS-07
Manufacturer:Indian Space Research Organisation
Power:357 watts
Launch Date:10 February 202303:48 UTC
Launch Rocket:Small Satellite Launch Vehicle, (SSLV-D2)
Launch Site:Satish Dhawan Space Centre, First Launch Pad (FLP)
Launch Contractor:Indian Space Research Organisation
Entered Service:10 February 2023
Orbit Reference:Geocentric orbit
Orbit Regime:Polar orbit
Orbit Inclination:37.2°
Orbit Period:minutes
Apsis:gee
Instruments:mmWave Humidity Sounder (MHS), Spectrum Monitoring Payload (SMP)
Programme:Earth observation satellites series

EOS–07 (formerly known as Microsat-2B) is an Earth observation satellite developed by the Indian Space Research Organisation (ISRO) and launched during the SSLV-D2 mission, the first successful mission of the SSLV rocket. It's a minisatellite designed to accommodate new technology payloads in a quick turn-around time.[1] [2]

Structure and Payloads

It has a cubical structure consisting of six Honeycomb structures.[3] 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), micro-Inertial Reference Unit (mIRU), and a Magnetometer. It has a passive thermal control system with Optical Solar Reflector, Multi-Layer Insulation, Thermal interface material, etc.[3] 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 which 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 sub-systems. It has a data storage capacity of 32 Gb. The RF system uses S-Band Telemetry Transmitters, S-Band Telecommand Receiver, 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; 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 watt power. The Spectrum Monitoring Payload weighs 13 kg, requires a power~ of 35W, and has a data rate of 2 Mbit/s.

Notes and References

  1. Web site: SSLV D2, EOS 07 MISSION. February 2023. isro.gov.in. 2023-11-09. 2023-10-15. https://web.archive.org/web/20231015023315/http://www.isro.gov.in/media_isro/pdf/Missions/SSLV/SSLV_D2_EOS_07_DigitalBrochure.pdf. live.
  2. News: 10 February 2023 . Successful flight of Small Satellite Launch Vehicle (SSLV) . . 14 February 2023 . 13 February 2023 . https://web.archive.org/web/20230213220902/https://pib.gov.in/PressReleaseIframePage.aspx?PRID=1897963 . live .
  3. Web site: SSLV-D2/EOS-07 MISSION . 2023-08-24 . www.isro.gov.in . 2023-08-24 . https://web.archive.org/web/20230824185325/https://www.isro.gov.in/mission_SSLV_D2.html?timeline=timeline . live .