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Facts for Prelims (FFP)


Source: TOI

 Context: India’s first solar mission, Aditya-L1, intended for launch by the end of August or early September, has arrived at the Sriharikota spaceport.


The Aditya-L1 mission will be launched to the L1 orbit (which is the first Lagrangian point of the Sun-Earth system)

  • Aditya-L1 is the first Indian space mission to observe the Sun and the solar corona
  • L1 orbit allows Aditya-L1 to look at the Sun continuously
  • It will be launched aboard a PSLV-XL launch vehicle


The objective of the mission:

To study solar upper atmospheric (chromosphere and corona) dynamics and understand the physics of the solar corona and its heating mechanism.



Aditya-L1 has seven payloads in total, of which the primary payload is the Visible Emission Line Coronagraph(VELC).

  • VELC is a solar coronagraph capable of simultaneous imaging, spectroscopy and spectro-polarimetry
  • Significance: No other solar coronagraph in space has the ability to image the solar corona as close to the solar disk as VELC can. It can image it as close to 1.05 times the solar radius.


About Lagrange points:

The Lagrange points are points of equilibrium for small-mass objects under the influence of two massive orbiting bodies. At Lagrange points, the gravitational pull of two large masses precisely equals the centripetal force required for a small object to move with them. These points in space can be used by spacecraft to reduce fuel consumption needed to remain in position.