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National Space Science & Technology

Aditya-L1: India's first space based mission to study the Sun, in a halo orbit about 1.5 million km from the Earth

Aditya-L1 is the first space based Indian mission to study the Sun.
The spacecraft is placed in a halo orbit around the Lagrange point 1 (L1) of the Sun-Earth system, which is about 1.5 million km from the Earth.
A satellite in a halo orbit around L1 has the advantage of continuously viewing the Sun without any occultation or eclipses, which allows solar activity and its effect on space weather to be observed in real time.
The spacecraft carries seven payloads to observe the photosphere, the chromosphere and the corona using electromagnetic, particle and magnetic field detectors.
Four payloads directly view the Sun and the remaining three carry out in-situ studies of particles and fields at the Lagrange point L1.
The remote sensing payloads are the Visible Emission Line Coronagraph, the Solar Ultraviolet Imaging Telescope, the Solar Low Energy X-ray Spectrometer and the High Energy L1 Orbiting X-ray Spectrometer.
The in-situ payloads are the Aditya Solar wind Particle Experiment, the Plasma Analyser Package For Aditya and a set of advanced tri-axial high resolution digital magnetometers.
The satellite was placed in its intended orbit by the PSLV-C57 mission.

Orbit: Halo orbit around Sun-Earth Lagrange point 1 Distance from the Earth: About 1.5 million km Payloads: 7, of which 4 remote sensing and 3 in-situ Launch vehicle mission: PSLV-C57
Why it matters for exams: The Lagrange point, the distance from the Earth, the count of payloads and the launch vehicle are the four facts an examiner extracts from this mission.
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In plain words

L1 Lagrange point 1 of the Sun-Earth system — A point about 1.5 million km from the Earth where a spacecraft can hold station and view the Sun without interruption.

VELC Visible Emission Line Coronagraph — The remote sensing payload for imaging and spectroscopy of the corona.

ASPEX Aditya Solar wind Particle Experiment — An in-situ payload that analyses solar wind protons and heavier ions with their directions.

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