AstroSat and India's Space Observatories

TOPIC CLASSIFICATION

Subject: Science & Technology - Space Technology - Space Observatories
Sub-topic: AstroSat - India's First Multi-Wavelength Space Observatory (2015), Five Payloads (UVIT, SXT, LAXPC, CZTI, SSM), Science Objectives (X-ray binaries, Active Galactic Nuclei, Supernovae, Stellar Astrophysics, Exoplanet Transits), Observations and Discoveries; Other Indian Space Observatories - Chandrayaan-1 (TMC, HySI, M3), Chandrayaan-2 (Orbiter Instruments), Mangalyaan (MCC, MSM, LAP), Aditya-L1 (VELC, SUIT, SoLEXS, HEL1OS), XPoSat (2024), NISAR (ISRO-NASA); Space Situational Awareness - NETRA, AstroSat CZTI as a GRB Monitor
Mains GS Paper-III: Science & Technology - space technology - space-based observatories - ISRO's scientific missions - astronomy and astrophysics from space.

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EXAMINER REASONING

AstroSat is India's flagship multi-wavelength space observatory, placing India among a select group of nations with space-based astronomical capabilities. Prelims tests: AstroSat (2015) - 5 payloads (UVIT, SXT, LAXPC, CZTI, SSM), launch vehicle (PSLV-C30), orbit (650 km circular, 6° inclination), wavelength coverage (UV to hard X-ray - 0.3-100 keV), first Indian dedicated astronomy satellite, comparison with NASA's Hubble, Chandra, ESA's XMM-Newton. Mains demands: (a) multi-wavelength astronomy - different celestial objects emit at different wavelengths - simultaneous observation across UV, X-ray gives a complete picture - AstroSat unique advantage (covers UV + X-rays simultaneously -...