ISRO conducts situational awareness carrying 3 NASA, 1 NASA-ESA spacecraft at final destination of Aditya L1 india news


Bengaluru: Like Aditya-L1India’s first solar mission heads towards its final destination, ISRO Situational awareness analysis of the location,L1 point is performed.
To date, there are four spacecraft in L1 halo orbit: NASA has WIND, Advanced Composition Explorer (ACE), and Deep Space Climate Observatory (DSCOVER), while the fourth, the Solar and Heliospheric Observatory (SOHO), is a joint mission of NASA and the European Space Agency (ESA).
Lagrange points, also known as libration points, are unique locations in space where the gravitational force of two massive bodies (such as sun and earth) is equal to the centripetal force required to take a small object (such as a spacecraft) with itself, ISRO said.
It states that this makes the Lagrange points an excellent location for spacecraft to make orbit corrections and hence the fuel requirements required to maintain the desired orbit are kept to a minimum.

ISRO’s ‘Aditya L1’ solar mission takes important steps towards Earth-Sun L1 point

“For any combination of two orbiting bodies (such as the Sun-Earth and Earth-Moon systems), there are five Lagrange points (L1 to L5), all in the orbital plane of the two larger bodies. Three points – L1, L2, and L3 – are dynamically unstable and lie on a line passing through the centers of the two larger bodies, while the remaining two points – L4 and L5 – are stable points and each lie on the third vertex of an equilateral It acts as a triangle formed by the centers of two larger bodies,” ISRO said.
L1 is particularly important because it is located between the two primaries (Sun and Earth), making it an ideal location for spacecraft as they allow continuous observations of the primary bodies, continuous communication with Earth, and unobstructed views of celestial bodies. Allow.
These orbits are suitable for scientific missions like Aditya which will act like a solar observatory around L1 and communicate with Earth.
ISRO said, “Despite the extremely sparse population in the L1 point and the vast separation between them, close approach evaluation for an operational spacecraft on Lagrange Point Orbit (LPO) is difficult due to the large positional uncertainty and sensitivity to other perturbing forces.” is desirable.”
It states that orbit determination (OD) for LPOs requires track data collection over a long period of time, typically a few days. Typical OD accuracy is of the order of a few kilometers.
ISRO said, “For Aditya-L1, ISRO, in collaboration with NASA-JPL, plans to conduct such analyzes from time to time to ensure safety and avoid any possibility of close approach with other neighboring spacecraft.” Making it.”
Aditya-L1 will operate in a ‘halo orbit’ around the Sun-Earth L1 point, which is located about 1.5 million km from Earth.
“Halo orbits are periodic, three-dimensional orbits around a Lagrange point (L1, L2 or L3) and involve an out-of-plane momentum component relative to the primary bodies. The size of the orbit is so large that it can be seen continuously from Earth and it will appear to form a halo around the Lagrange points (here L1 for Aditya), ISRO said.
ISRO said several previous missions have used the L1 point, including the International Sun-Earth Explorer (ISE-3), the Genesis mission, ESA’s LISA Pathfinder, China’s Chang’e 5 lunar orbiter and NASA’s Gravity Recovery and Interior Mission (GRI) mission. Recovery (Grail) is included. missions, all of which have contributed to the understanding of space and the ability to monitor space weather phenomena.
And the operational spacecraft currently deployed there are also providing critical early warnings on adverse space weather events that help protect orbiting space assets and ground-based infrastructure.
Watch ISRO’s ‘Aditya L1’ solar mission takes important steps towards Earth-Sun L1 point




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