India successfully launches Aditya mission to study the sun

Ajay0 · Sep 8, 2023

India successfully launched the Aditya mission to study the sun on September 5,2023.

ISRO Aditya L1 launch highlights: Launch successful as satellite separates from PSLV

The Aditya L1 mission will take an approach similar to the Chandrayaan-3 mission. It will first get into an Earth orbit and from there, it will go higher and faster until it eventually puts itself on a path to its final halo orbit around the first Lagrange point (L1) of the Earth and the Sun. The Lagrange point is a convenient vantage point for the probe because being around it would mean that it can remain in the same position without using a lot of fuel. This is also why the National Aeronautics and Space Administration (NASA) placed the James Webb Space Telescope at the second Lagrange point. (L2)

Off the back of a successful launch on the PSLV rocket, the Aditya L1 mission now has a 120-day mission ahead of it. In those four months, the spacecraft will first raise its orbit around Earth multiple times till it is in position to leave Earth's sphere of influence. After that exit manoeuvre, it will cruise towards the L1 Lagrange point till it reaches nearby and puts itself in a halo orbit around it.
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Lagrange point - Wikipedia

Normally, the two massive bodies exert an unbalanced gravitational force at a point, altering the orbit of whatever is at that point. At the Lagrange points, the gravitational forces of the two large bodies and the centrifugal force balance each other. This can make Lagrange points an excellent location for satellites, as orbit corrections, and hence fuel requirements, needed to maintain the desired orbit are kept at a minimum.
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wilsjane · Sep 9, 2023

Sitting here this morning and pouring with sweat, I think the sun must be on it's way to study us.

Ajay0 · Oct 5, 2023

The spacecraft Aditya has gone beyond the earths sphere of influence, the second Indian spacecraft to do so after Mangalyaan (Mars Orbiter Mission).

ISRO's Aditya-L1 spacecraft departs Earth's sphere of influence

The Indian Space Research Organisation (ISRO) reported on September 30 that the Aditya-L1 spacecraft successfully departed Earth's sphere of influence and will from now on be navigating its path towards the Sun-Earth Lagrange Point 1 (L1).

Aditya-L1 mission will reach its observation point in four months according to ISRO. According to the agency, it will be positioned in a halo orbit around Lagrangian Point 1 (or L1) that is located 1.5 million kilometres from Earth in the direction of the Sun.

The spacecraft is equipped with seven different payloads designed to carry out a study of the Sun. Four of these payloads will observe the light from the sun, while the remaining three will measure in-situ parameters of the plasma and magnetic fields.
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scratcho · Oct 5, 2023

There was going to be an expedition to the sun a few years back. Some folks worried about the lives of the scientists on the mission, but they said not to worry--they were going at night.

Ajay0 · Dec 4, 2023

The Indian Space Research Organisation (ISRO) on Saturday said Aditya Solar Wind Particle Experiment (ASPEX) payload onboard India's first solar satellite Aditya-L1, has commenced its operations and started working normally.

ISRO's Aditya L1 mission observes solar winds, signals success

Aditya L1, India's ambitious endeavour to explore the sun, has taken a significant step forward by initiating observations of solar winds. The Indian Space Research Organisation (ISRO) announced this development, stating that the Aditya Solar Wind Particle Experiment (ASPEX) aboard the satellite is now operational and functioning as expected.

ASPEX consists of two instruments: the Solar Wind Ion Spectrometer (SWIS) and STEPS (SupraThermal and Energetic Particle Spectrometer). While STEPS began operations on September 10, the SWIS instrument was activated recently and has shown excellent performance, as per ISRO.

Additionally, the space agency shared an image on X (formerly Twitter), depicting the fluctuations in energy levels observed in proton and alpha particle counts recorded by the new payload.
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Ajay0 · Jan 7, 2024

Aditya L1 has reached the solar orbit.

ISRO’s Aditya-L1 successfully placed in a halo orbit around L1 point

Aditya-L1: India's Sun mission reaches final destination

ISRO Chairman S Somnath told reporters that the halo orbit insertion process was carried out as intended. “Today’s event was to place the Aditya L-1 in the precise halo orbit. The spacecraft was moving towards the halo orbit but we had to make some corrections to put it in the right place. If we do not do the correction today there could have been a possibility that it could escape from this point (L-1 point). But we would not have allowed that to happen as there are some contingencies in place, but I am only telling mathematically it can escape.”

“So that has been very precisely done [placing the spacecraft in the halo orbit]. What we have achieved today is exact placement based on our measurement and very correct prediction of the velocity requirement. Right now in our calculation the spacecraft is in the right place,” he added.

The ISRO said that the halo orbit insertion of Aditya-L1 was accomplished at 4 p.m. and that the final phase of the manoeuvre involved firing of control engines for a short duration.

“The orbit of Aditya-L1 spacecraft is a periodic halo orbit which is located roughly 1.5 million km from earth on the continuously moving Sun–Earth line with an orbital period of about 177.86 earth days. This halo orbit is a periodic, three-dimensional orbit at L1 involving Sun, Earth and a spacecraft. This specific halo orbit is selected to ensure a mission lifetime of 5 years, minimising station-keeping manoeuvres and thus fuel consumption and ensuring a continuous, unobstructed view of the Sun,” the ISRO said after the orbit Insertion was accomplished.

It further said that the insertion of Aditya-L1 into this halo orbit presents a critical mission phase, which demands precise navigation and control.

“A successful insertion further involved constant monitoring along with the adjustment of the spacecraft’s speed and position by using onboard thrusters. The success of this insertion not only signifies ISRO’s capabilities in such complex orbital manoeuvres, but it gives confidence to handle future interplanetary missions,” the space agency added.
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