India's solar mission spacecraft Aditya-L1 gets send off from Earth as ISRO performs key manoeuvre
Bengaluru (PTI): Aditya L1 spacecraft, India's first space-based mission to study the Sun, got a "send-off" from the Earth after orbiting it since its September 2 launch as it underwent a key manoeuvre in the early hours of Tuesday, ISRO said.
The Trans-Lagrangian Point 1 Insertion manoeuvre marks the beginning of the spacecraft's about 110-day trajectory to the destination around the L1 Lagrange point, a balanced gravitational location between the Earth and the Sun.
"Off to Sun-Earth L1 point! The Trans-Lagrangian Point 1 Insertion (TL1I) manoeuvre is performed successfully. The spacecraft is now on a trajectory that will take it to the Sun-Earth L1 point. It will be injected into an orbit around L1 through a maneuver after about 110 days," ISRO said in a post on X (formerly Twitter).
This is the fifth consecutive time the Indian Space Research Organisation (ISRO) has successfully transferred an object on a trajectory toward another celestial body or location in space, the country's space agency said.
Aditya-L1 is the first Indian space-based observatory to study the Sun from a halo orbit around first Sun-Earth Lagrangian point (L1), located roughly 1.5 million km from earth, which is about one per cent of the Earth-Sun distance.
The Sun is a giant sphere of gas, and Aditya-L1 would study the outer atmosphere of the Sun. It will neither land on the Sun nor approach the Sun any closer.
Since its launch, Aditya-L1, during its journey around the Earth, underwent four Earth-bound manoeuvres on September 3, 5 ,10 and 15 respectively, during which it gained the necessary velocity for its further journey to L1.
Upon arrival at the L1 point, another manoeuvre binds Aditya-L1 to an orbit around L1.
The satellite spends its whole mission life orbiting around L1 in an irregularly shaped orbit in a plane roughly perpendicular to the line joining the Earth and the Sun.
Aditya-L1 is expected to arrive at the intended orbit at the L1 point after about 127 days, ISRO had said soon after the launch.
ISRO's Polar Satellite Launch Vehicle (PSLV-C57) on September 2 successfully launched the Aditya-L1 spacecraft, from the Second Launch Pad of Satish Dhawan Space Centre (SDSC), Sriharikota.
After a flight duration of 63 minutes and 20 seconds that day, Aditya-L1 spacecraft was successfully injected into an elliptical orbit of 235x19500 km around the earth.
According to ISRO, a spacecraft placed in the halo orbit around the L1 point has the major advantage of continuously viewing the Sun without any occultation /eclipses. This will provide a greater advantage of observing the solar activities and its effect on space weather in real time.
Aditya-L1 carries seven scientific payloads indigenously developed by ISRO and national research laboratories including Indian Institute of Astrophysics (IIA), Bengaluru, and Inter University Centre for Astronomy and Astrophysics (IUCAA), Pune.
The payloads are to observe the photosphere, chromosphere and the outermost layers of the Sun (the corona) using electromagnetic and particle and magnetic field detectors.
Using the special vantage point L1, four payloads directly view the Sun and the remaining three payloads carry out in-situ studies of particles and fields at the Lagrange point L1, thus providing important scientific studies of the propagatory effect of solar dynamics in the interplanetary medium.
The suits of Aditya L1 payloads are expected to provide the most crucial information to understand the problem of coronal heating, coronal mass ejection, pre-flare and flare activities and their characteristics, dynamics of space weather, propagation of particles and fields.
According to scientists, there are five Lagrangian points (or parking areas) between the Earth and the Sun where a small object tends to stay if put there. The Lagrange Points are named after Italian-French mathematician Joseph-Louis Lagrange for his prize-winning paper -- "Essai sur le Probl me des Trois Corps, 1772."
These points in space can be used by spacecraft to remain there with reduced fuel consumption.
At a Lagrange point, the gravitational pull of the two large bodies (the sun and the earth) equals the necessary centripetal force required for a small object to move with them.
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Kangana Ranaut shown black flags in Himachal's Lahaul and Spiti, BJP files complaint with CEO
Shimla, May 20: Actor Kangana Ranaut, BJP candidate from the Mandi parliamentary constituency, was shown black flags by local people and Congress workers at Kaza in Lahaul and Spiti on Monday.
The Himachal Pradesh BJP filed a complaint with the state chief electoral officer (CEO) demanding transfer of election officials and an investigation into the incident as both the BJP and the Congress were given permission to hold rallies adjacent to each other.
The Congress workers raised anti-Kangana slogans - "Kangana, go back, Kangana Vangana nahi chalegi". They were apparently enraged over her remarks on Tibetan spiritual leader Dalai Lama in April last year.
Ranaut had tweeted a meme featuring the Dalai Lama that said, "The Dalai Lama receives a warm welcome at the White house". The photoshopped picture in the tweet showed the Dalai Lama sticking his tongue out with US President Joe Biden with a comment - Both of them have the same illness, definitely they could be friends.
Following this, a group of Buddhists staged a dharna outside her office in Mumbai.
Later she apologised saying she didn't mean to hurt anyone, and it was a harmless joke about Biden being friends with the Dalai Lama.
Leader of the Opposition in the Himachal Pradesh Assembly Jai Ram Thakur, who had accompanied Ranaut to Kaza to campaign for the BJP, on Monday alleged that the Congress workers tried to disturb the meeting of the BJP and pelted stones on their carcade while they were returning.
Talking to reporters, he said, "It is unfortunate that for the first time, permission was given to hold a parallel rally at the venue to the Congress where prior permission was already granted to the BJP to hold the rally.
Efforts were made to disturb our rally and the Congress workers raised shameful slogans, stopped our carcade and pelted stones, injuring one person."
Thakur added that they go for campaigning all over the state but such things have happened for the first time, which shows "frustration" of the Congress and they would take up the issue with the Election Commission.
Later, in a complaint filed with the Himachal Pradesh CEO, BJP state office secretary Parmod Kumar Thakur said the Congress workers allegedly tried to illegally restrain the political procession and even pelted stones and demanded an investigation into the incident.
"The district administration granted permission for organising a political meeting to the Congress adjacent to the place already scheduled to hold a political meeting of the BJP at Kaza under undue influence of the state government in utter violation of the Model Code of Conduct (MCC)", he said.
In the complaint, the BJP demanded the immediate transfer of election officials from Lahaul and Spiti and said giving permission to both the parties at the same location at the same time was a "big lapse" on the part of the Election Commission "in spite of the fact that permission to the BJP was provided first and the officers involved in this act are biased against the BJP, and free and fair elections are doubtful under the circumstances."
Lahaul and Spiti SP Mayank Chowdhary told PTI that workers of both the BJP and the ruling Congress came face to face but there was no clash and no person was injured. However, one worker sprained his leg, he added.
Bhishan Shashni, Congress election coordinator for Lahaul and Spiti claimed that the Congress workers were peacefully protesting but a large number of people, who were hurt by Ranaut's remarks about the Tibetan spiritual leader, joined the protest.
Earlier, Congress candidate from the Mandi Lok Sabha seat Vikramaditya Singh had asked why Ranaut did not visit Spiti and returned from Reckong Peo alleging that she was afraid she would be shown black flags for her remarks against the Dalai Lama.
