|Mission type||Space observatory|
|Mission duration||5 years (planned)|
|Spacecraft||X-ray Polarimeter Satellite|
|Manufacturer||Raman Research Institute|
|Launch mass||480 kg (1,060 lb)|
|Payload mass||125 kg (276 lb)|
|Dimensions||65 × 65 × 60 cm (26 × 26 × 24 in)|
|Start of mission|
|Launch date||Q2 2023 (planned) |
|Launch site||Satish Dhawan, First Launch Pad|
|Contractor||Indian Space Research Organisation|
|Reference system||Geocentric orbit|
|Regime||Low Earth orbit|
|Altitude||500–700 km (310–430 mi)|
|Polarimeter Instrument in X-rays (POLIX)|
X-ray Spectroscopy and Timing (XSPECT)
The X-ray Polarimeter Satellite (XPoSat) is a ISRO planned space observatory to study polarisation of cosmic X-rays. It is planned to be launched in Q2 2023 on a Small Satellite Launch Vehicle (SSLV), with mission life of at least five years.
The telescope is being developed by the Indian Space Research Organisation (ISRO) and the Raman Research Institute.
Studying how radiation is polarised gives away the nature of its source, including the strength and distribution of its magnetic fields and the nature of other radiation around it. XPoSat will study the 50 brightest known sources in the universe, including pulsars, black hole X-ray binaries, active galactic nuclei, and non-thermal supernova remnants. The observatory will be placed in a circular low Earth orbit of 500–700 km (310–430 mi).
Project began in September 2017 with ISRO grant of ₹95,000,000. Preliminary Design Review (PDR) of the XPoSat including the POLIX payload was completed in September 2018, followed by preparation of POLIX Qualification Model and beginning of some of its Flight Model components fabrication.
Two payloads of XPoSat are hosted on a modified IMS-2 satellite bus. Primary scientific payload is Polarimeter Instrument in X-rays (POLIX), which will study the degree and angle of polarisation of bright astronomical X-ray sources in the energy range 8-30 keV. POLIX, a 125 kg (276 lb) instrument, is being developed by the Raman Research Institute. Its science objectives are to measure:
Secondary payload is XSPECT (X-ray Spectroscopy and Timing), which will give spectroscopic information of soft X-rays in the energy range of 0.8-15 keV.