Aditya L1 successfully undergoes the second earth-bound manoeuvre: ISRO
Bengaluru (PTI): Aditya L1, the first space based Indian mission to study the Sun underwent the second earth-bound manoeuvre successfully, during the early hours on Tuesday, ISRO said.
ISRO's Telemetry, Tracking and Command Network (ISTRAC) carried out the operation.
"The second Earth-bound manoeuvre (EBN#2) is performed successfully from ISTRAC, Bengaluru. ISTRAC/ISRO's ground stations at Mauritius, Bengaluru and Port Blair tracked the satellite during this operation. The new orbit attained is 282 km x 40225 km," ISRO said in a post on X (formerly Twitter).
The next manoeuvre (EBN#3) is scheduled for September 10, 2023, around 02:30 Hrs. IST, it 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), which is located roughly 1.5 million km from earth.
The first earth-bound manoeuvre was successfully performed on September 3.
The spacecraft will undergo two more earth-bound orbital manoeuvres before placing in the transfer orbit towards the Lagrange point L1. Aditya-L1 is expected to arrive at the intended orbit at the L1 point after about 127 days.
ISRO's Polar Satellite Launch Vehicle (PSLV-C57) on September 2 had 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, Aditya-L1 spacecraft was successfully injected into an elliptical orbit of 235x19500 km around the earth.
According to ISRO, a satellite 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 Problème 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.
Let the Truth be known. If you read VB and like VB, please be a VB Supporter and Help us deliver the Truth to one and all.
NEET-UG: 2 more held, role of several NTA officers under scanner; CBI focussing on source of leak
New Delhi (PTI): The CBI has arrested two more persons in connection with the NEET (UG) paper-leak case, with the role of several officers of the National Testing Agency (NTA) and other organisations, who had access to the printing press where the papers were printed, coming under the scanner, officials said on Thursday.
The agency has arrested Dhananjay Lokhanda from Ahilyanagar and Manisha Waghmare from Pune and conducted searches at 14 locations across the country in the last 24 hours, they said.
The CBI is focussing on identifying the source of the leak that has caused massive disappointment to lakhs of aspirants eyeing a seat in undergraduate medical courses, which are allotted after the highly-competitive examination, the officials said.
According to the CBI probe so far, the involvement of public servants in the leak cannot be ruled out.
The Central Bureau of Investigation (CBI) has arrested three individuals from Jaipur -- Mangilal Biwal, Vikas Biwal and Dinesh Biwal -- along with Yash Yadav from Gurugram and Shubham Khairnar from Nashik.
Khairnar was in touch with Yadav and informed him in April that Mangilal Biwal was ready to pay Rs 10-12 lakh for arranging leaked NEET (UG) 2026 questions for his younger son.
Khairnar allegedly provided 500 to 600 questions from the leaked paper to Yadav, the officials said, adding that the questions could have helped score enough marks to get a seat in a reputed medical college.
Mangilal Biwal allegedly procured the paper from Yadav, who was known to his elder son Vikas Biwal from an NEET coaching in Rajasthan's Sikar. The deal between Mangilal Biwal and Yadav was for Rs 10 lakh, if 150 questions from the question bank matched with those in the National Eligibility-cum-Entrance Test (NEET) paper, the officials said.
Mangilal Biwal shared the paper with his son and further distributed it among relatives.
Yadav also told Vikas Biwal to find additional candidates for the questions to recover some of the money that he had spent on getting those, the officials said.
An analysis of digital devices has given the agency incriminating chats, leaked question papers and other digital evidence. The CBI will subject the devices to a forensic examination to get the deleted data, the officials said.
The federal agency has registered an FIR and formed teams to probe the alleged NEET (UG) paper leak that resulted in the cancellation of the exam held on May 3.
The NEET (UG) 2026 was conducted across 551 Indian cities and at 14 overseas centres. Nearly 23 lakh candidates had registered for the test, which was administered by the NTA at centres across the country.
According to the NTA, information regarding alleged malpractice was received on the evening of May 7, four days after the examination was held. The NTA said the inputs were escalated to central agencies the following morning for "independent verification and necessary action".
The Rajasthan Police's Special Operations Group (SOG) has claimed that a "guess paper" for chemistry, allegedly circulated among students ahead of the examination, had approximately 410 questions, including roughly 120 that appeared in the test.
