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.
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Du Plessis fifty, bowlers carry RCB to four-wicket win over GT
Bengaluru, May 4: Royal Challengers Bengaluru pressed the self-destruction button halfway but a blazing fifty by captain Faf du Plessis had enough torque in it to carry them to a four-wicket over Gujarat Titans in their IPL match here on Saturday.
Du Plesiss (64, 23b, 10x4, 3x6) and Kohli (42, 27b, 2x4, 4x6), who added 92 runs in just 35 balls for the opening wicket, were in prime touch as Royal Challengers moved past a frail target of 148, braving some nervy moments, most of it their own creation.
The win also lifted RCB to seventh place on the table with eight points from 11 matches, and kept their mathematical chances of making it to the play-offs alive.
Du Plessis and Kohli dealt in boundaries as the home side racked in 92 runs in Power Play, that contained 10 fours and seven maximums.
Both Du Plessis and Kohli were severe on all GT bowlers, as the latter began the butchering with two sixes off pacer Mohit Sharma in the first over.
Du Plessis was in no mood to play the role of a sidekick as he waded into left-arm pacer Josh Little with a sequence of 4, 6, 4, 4 in the second over that produced a total of 20 runs.
The Titans introduced IPL debutant left-arm spinner Manav Suthar in the hope of containing Kohli at least, but the ploy was foiled spectacularly.
The RCB talisman showed his increasing comfort against spin, clobbering Suthar for two successive sixes.
Du Plessis reserved his punitive blade for Mohit, whom he carted around for four fours in the fifth over, as the South African reached fifty in just 18 balls before falling to Little.
RCB entered a phase of struggle from there as they lost last match centurion Will Jacks, Rajat Patidar, Glenn Maxwell and Cameron Green between the sixth and 10th overs for just 20 runs.
Little (4/45) and spinner Noor Ahmad (2/23) were the chief perpetrators as RCB slipped from 92 for 1 to 112 for five.
Ahmad soon ousted Kohli as RCB were 117 for six but Dinesh Karthik (21 not out, 12b) was cool under pressure as RCB notched their overall fourth and third win in a row of this season.
Before RCB batsmen joined the party, their bowlers came up with an immaculate effort on a supportive pitch to bowl GT to a modest 147.
There were a couple of good partnerships – 61 between David Miller and Shahrukh Khan and 44 by Rahul Tewatia and Rashid Khan – but the Titans lacked that one big innings or a stand that could have given them a firmer grip on the match.
In fact, they seemed distinctly incapable of accelerating even in the Power Play as their top-order batters struggled against RCB pacers, Mohammed Siraj (2/29) and Yash Dayal (2/21) who stuck to a wonderful length.
That GT managed to strike just two fours in Power Play offered ample evidence to their struggle and RCB bowlers’ accuracy.
The Gujarat side’s Power Play score of 23 for three was the lowest in the segment this season, and it was mainly due to Siraj’s domination upfront.
He consumed an out-of-form Wriddhiman Saha with a fine outswinger which the GT opener wafted to Dinesh Karthik behind the stumps.
Shubman Gill followed soon as his attempted swat to the on-side off Siraj took a leading edge and ended in the hands of Vysakh Vijayakumar at deep point.
Green fetched the third wicket for RCB in the Power Play when he jettisoned in-form B Sai Sudharsan, whose feeble pull close to the body was snaffled by Kohli at mid-off.
Miller (30, 20b) and Shahrukh (37, 24b) tried their best to drag GT out of the woods with a well-paced 61-run alliance off 37 balls for the fourth wicket.
Miller, who was fortunate to get dropped on 23 off Green by Karn Sharma, played archetypal power shots.
He punished leg-spinner Karn for a couple of sixes – a pull and a loft over extra cover – but fell to the same bowler when a miscued heave was grabbed by Maxwell at deep.
But a bigger misfortune was in store for the visitors as Shahrukh, who backed up a tad too far to Rahul Tewatia’s soft drop, could not beat a throw from Kohli to the non-striker’s end.
For the sixth-wicket, Tewatia (35, 21b) and Rashid (18, 14b) added 44 off 29 balls, but the latter’s desire to be innovative against Yash Dayal saw the ball crashing onto the stumps.
Tewatia, who punished Karn for 18 runs (4, 6, 4, 4) in the 16th over, departed soon.
