eROSITA

• A three-week long programme entitled, ‘Cosmology – The next decade’, saw discussions on the X-ray telescope eROSITA which is to be launched in June 2019.

About eROSITA

• It is an X-ray telescopewhich will be launched by Roscosmos of Russia to replace the 1990s ROSAT telescope.

• It was developed and built by Max Planck Institute for Extraterrestrial Physics (MPE) in Germany.

• The telescope consists of seven identical mirror modules with 54 nested gold-coated mirrors each, manufactured very precisely to collect the high-energy photons and guide them to the X-ray sensitive cameras placed at their focus.

• eROSITA will be 25 times more sensitive than the ROSAT X-ray telescope.

• eROSITA will be put to the second Lagrange point (L2) of the Sun-Earth system, by a Russian spacecraft Spectrum-Roentgen-Gamma (SRG), which also carries the Russian telescope “ART-XC”.

• eROSITA will produce a new map of the Universe in X-rays, revealing how the largest cosmic structures evolve.

About ROSAT telescope

• ROSAT (short for Röntgensatellit) was a German- led satellite X-ray telescope developed in collaboration with the UK and the US.

• It was launched in 1990 and performed the first deep all-sky survey in X-rays. It was shut down in 1999.

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Mains Paper 3: Science and thechnology

Prelims level: eROSITA

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