EMISAT is a 436 kg satellite built by ISRO for electromagnetic spectrum measurement and operated by DRDO. PSLV-C45 placed it in a 748 km sun-synchronous polar orbit on 1 April 2019.
The officially stated purpose of EMISAT is electromagnetic spectrum measurement. DRDO, India's defence research organisation, operates the satellite.
ISRO built EMISAT around its Mini Satellite-2 (IMS-2) bus. It weighed 436 kg at launch.
PSLV-C45 lifted off from the second launch pad at Sriharikota at 9:27 IST on 1 April 2019. It was the first flight of PSLV-QL, a version with four strap-on motors.
About 17 minutes after lift-off, EMISAT was released into a 748 km sun-synchronous polar orbit. The rocket's fourth stage then restarted twice to place 28 international customer satellites at 504 km, and later moved to 485 km to serve as an orbital platform for three experiments.
The public satellite catalogue carries EMISAT with an operational flag, in an orbit of about 733 × 760 km.