ISRO's Aditya-L1 spacecraft to be placed in its final destination orbit today
Bengaluru, Jan 6: ISRO will perform the final manoeuvre on Saturday to inject Aditya-L1 spacecraft -- the first space-based Indian observatory to study the Sun -- into its final destination orbit, some 1.5 million kilometres from the Earth.
According to ISRO officials, the spacecraft will be placed in a halo orbit around Lagrange point 1 (L1) of the Sun-Earth system, about 1.5 million km from the Earth. The L1 point is about one per cent of the total distance between the Earth and the Sun.
A satellite in a halo orbit around the L1 point has the major advantage of continuously viewing the Sun without any occultations/eclipses, they said, adding, this will provide a greater advantage in observing solar activities and its effect on space weather in real time.
"This manoeuvre (at around 4 pm on Saturday) will bind the Aditya-L1 to a halo orbit around L1. If we don't do this, there is a possibility that it will continue its journey, maybe towards the Sun," an ISRO official told PTI on Friday.
The Polar Satellite Launch Vehicle (PSLV-C57) launched the Aditya-L1 spacecraft from the second launch pad of Satish Dhawan Space Centre (SDSC), Sriharikota, on September 2 last year.
After a flight duration of 63 minutes and 20 seconds, it was successfully injected into an elliptical orbit of 235x19500 km around the Earth.
The spacecraft underwent a series of maneuvers thereafter and headed Sun-Earth Lagrange Point 1(L1), having escaped the Earth's sphere of influence.
The spacecraft carries seven payloads 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," according to the space agency.
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, and propagation of particles and fields, officials said.
The major science objectives of the Aditya-L1 mission are:
- Study of the Solar upper atmospheric (chromosphere and corona) dynamics.
- Study of chromospheric and coronal heating, physics of the partially ionized plasma, initiation of the coronal mass ejections, and flares.
- Observe the in-situ particle and plasma environment, providing data for the study of particle dynamics from the Sun.
- Physics of the solar corona and its heating mechanism.
- Diagnostics of the coronal and coronal loops plasma: Temperature, velocity and density.
- Development, dynamics and origin of coronal mass ejections (CMEs).
- Identify the sequence of processes that occur at multiple layers (chromosphere, base and extended corona) which eventually leads to solar eruptive events.
- Magnetic field topology and magnetic field measurements in the solar corona.
- Drivers for space weather (origin, composition and dynamics of solar wind).
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J-K: Six held with drugs, assets worth Rs 73 lakh attached in Udhampur
Jammu (PTI): Six persons were taken into custody during an intensified anti-narcotics crackdown, with police recovering contraband substances and over Rs 23 lakh in Doda and Kathua districts of Jammu and Kashmir, police said on Monday.
In a parallel action, properties worth over Rs 73 lakh linked to drug peddlers were also attached in Udhampur district under relevant legal provisions, the police said.
Additional Superintendent of Police, Doda, Mohd Aslam said three persons, including a woman, were detained during a raid on a house at Dak Mohalla in the main town following recovery of 85 grams of suspected brown sugar and over Rs 23 lakh on Sunday evening.
He identified the woman as Zareena Begum, stating that she had been under police surveillance following inputs indicating her involvement in drug peddling.
Besides Zareena, officials said her daughter and son-in-law were also picked up by police during the raid.
“We have taken three individuals into custody. Their roles are being examined, and based on that, arrests will be made. We are continuing raids at other suspected locations,” Aslam said.
Three drug peddlers --Pardeep Singh of Hiranagar, Rahees Butt of Billawar and Ali Sen of Amritsar (Punjab) -- were arrested along with heroin at different places in Kathua district, a police spokesman said.
He said while 2.79 gm of heroin was seized from Singh, 2.66 gm were recovered Butt. Similarly, 303 gm of heroin was seized from Sen who was intercepted near Berrian-Pattan village while moving in a private car from Bhagthali to Maggar Khad on the Jammu-Pathankot highway.
All the three were booked under the NDPS Act and further investigations are on, the spokesman said.
In Udhampur, the spokesman said properties worth Rs 73 lakh were attached in two separate cases registered under the Narcotic Drugs and Psychotropic Substances (NDPS) Act.
The attached properties included a newly constructed residential house, a car, a motorcycle and a mobile phone with a total value of Rs 65 Lakh, belonging to accused Saif Ali who was booked under the NDPS case in Majalta area early this year, he said.
In another action, movable property worth Rs 8 lakh comprising a car, belonging to accused Danish Butt of Doda has been attached under Section 68(F) NDPS Act in connection with an FIR registered at Rehambal police station, the spokesman said.
