EMISAT MISSION India's PSLV-C45 successfully injected EMISAT and 28 international customer satellites into their designated orbits. Launched from Satish Dhawan Space Centre (SHAR), Sriharikota. The first mission of PSLV-QL, a new variant of PSLV with four strap-on motors. EMISAT was successfully injected into an intended sun-synchronous polar orbit of 748 km height. EMISAT’s chief payload is made by Defence Research and Development Organization (DRDO). The PS4 payloads are Automatic Identification System from ISRO, Automatic Packet Repeating System from AMSAT, India and Advanced Retarding Potential Analyzer for ionospheric studies from Indian Institute of Space Science and Technology. The EMISAT satellite is aimed at electromagnetic measurement. The uniqueness of this mission is, it is going to place satellites in three different orbits for first time by ISRO. The maritime satellite application will help capture messages transmitted from ships. The Automatic Packet Repeating System from AMSAT (Radio Amateur Satellite Corporation) is to assist amateur radio operators in tracking and monitoring position data. The Advanced Retarding Potential Analyzer for Ionospheric Studies (ARIS) from the Indian Institute of Space Science and Technology (IIST) is to study the structure and composition of the ionosphere. About Polar Satellite Launch Vehicle (PSLV) Third generation launch vehicle of India. Liquid stages. Launched two spacecraft – Chandrayaan-1 in 2008 and Mars Orbiter Spacecraft in 2013. It can take up to 1,750 kg of payload to Sun-Synchronous Polar Orbits of 600 km altitude. PSLV has also been used to launch various satellites into Geosynchronous and Geostationary orbits, like satellites from the IRNSS constellation. Stages of PSLV

  1. Fourth Stage: PS4 ✓ The PS4 is the uppermost stage of PSLV, comprising of two Earth storable liquid engines. 2. Third Stage: PS3 ✓ The third stage of PSLV is a solid rocket motor that provides the upper stages high thrust
after the atmospheric phase of the launch Second Stage: PS2 ✓ PSLV uses an Earth storable liquid rocket engine for its second stage, known as the Vikas engine, developed by Liquid Propulsion Systems Centre. 4. First Stage: PS1 ✓ PSLV uses the S139 solid rocket motor that is augmented by 6 solid strap-on boosters. Strap-on Motors PSLV uses 6 solid rocket strap-on motors to augment the thrust provided by the first stage in its PSLV-G and PSLV-XL variants. What arethe Different kinds of orbits? There are 3 main types of orbits:
  1. Polar 2. Sun Synchronous 3. Geosynchronous
Polar orbits ✓ These orbits have an inclination near 90 degrees. ✓ The satellite sees every part of the Earth as the Earth rotates underneath it. ✓ 90 minutes for the satellite to complete one orbit. ✓ Uses such as measuring ozone concentrations, measuring temperatures in the atmosphere. Geosynchronous Orbits ✓ Called geostationary orbits, satellites in these orbits circle the Earth at the same rate as the Earth spins. ✓ 35,790 km above the Earth. ✓ Located near the equator. ✓ Also used for communication satellites. ✓ They have poor resolution. Sun Synchronous Orbits ✓ Satellite passes over a section of the Earth at the same time of day. ✓ The satellite has to shift its orbit by approximately one degree per day. ✓ These satellites orbit at an altitude between 700 to 800 km. ✓ Satellites that take pictures of the Earth would work best with bright sunlight.   Read Also: –A Relief for Housing Projects in 34th GST Council Meeting Read Also:-All You Need To Know About Indian Space Program     Comment down below if you have any query or suggestions.]]>