Satellites Current Affairs
The Indian Space Research Organisation (ISRO) is planning to set a new world record in space history by launching 103 satellites in one go on a single rocket in the first week of February, 2017.
These satellites will be launched on board of ISRO’s workhorse PSLV (C37) from the Satish Dhawan Space Centre in Sriharikota in Andhra Pradesh. The mission will carry three satellites from India and rest from other countries.
How these satellites will be placed in orbit?
- The satellites will be separated from vehicle in different directions, once launch vehicle reaches the orbital condition. The separation angle and time of separation will be different for every satellite.
- The separated satellites will have relative velocity of one metre per second. So after 1,000 seconds distance between satellite and rocket will be 1,000 metres. It will ensure that satellite will not collide with another.
- The first satellite launched will move at relatively faster velocity than the next satellite. Due to different relative velocities, distance between the satellites will increase continuously but the orbit will remain same.
The present record of highest number of satellites launched in a single mission has been 37 by Russia in 2014. NASA has launched 29 satellites in one go in 2013. In June 2016, ISRO had launched 20 satellites in one go.
The Indian Space Research Organisation (ISRO) has successfully launched remote sensing satellite Resourcesat-2A into its dedicated orbit.
It was launched onboard of Polar Satellite Launch Vehicle (PSLV)-C36 from first launch pad at Satish Dhawan Space Centre in Sriharikota. It was PSLV’s 38th flight and XL version of the rocket was used. It was the 37th consecutive successful flight of the rocket.
- Resourcesat-2A is a follow on mission to its predecessor remote sensing satellites Resourcesat-1 and Resourcesat-2, launched in 2003 and 2011 respectively.
- It is intended to continue the remote sensing data services to global users provided by it two predecessors.
- Resourcesat-2A weighs 1,235 kg and is placed into an 817 km polar sun synchronous orbit (i.e. orbiting pole-to-pole). The mission life of Resourcesat-2A is five years.
- It carries three payloads viz. high resolution Linear Imaging Self Scanner (LISS-4) camera, medium resolution LISS-3 camera, and coarse resolution Advanced Wide Field Sensor (AWiFS) camera. These three cameras of different resolution.
- These cameras will give regular micro and macro information on land and water bodies below, forests, farm lands and crop extent, coastal information, mineral deposits, rural and urban spreads besides helping in disaster management.
- It also carries two Solid State Recorders with a capacity of 200 Giga Bits. Each of it can store the images taken by its cameras which can be read out later to ground stations.
The PSLV rocket is a four stage/engine indigenous light-lifting rocket powered by solid and liquid fuel alternatively. It has emerged as the workhorse launch vehicle of ISRO offered for launching satellites for international customers. Between 1994 and 2016, the PSLV has launched a total of 121 satellites, of which 42 are Indian satellites and 79 satellites are from abroad. The PSLV-XL variant of the rocket is 44.4 metres tall and weighs 3201 tonnes.