Astrosat is a smaller version of "Hubble", the U.S.-European joint space Observatory. It will be Launched through Polar Satellite Launch Vehicle from Sriharikota at 10 am IST Monday.
Instruments on board will study Black Holes, Quasars, Neutron Stars, White Dwarfs and Pulsars.
In a first, the PSLV will also carry a payload of four U.S. Commercial Satellites, the first Launch of U.S. Satellites by India. The Satellites are start up Satellites for Weather Monitoring.
Wishing all the Best to ISRO