ISRO's inaugural SSLV-D1/EOS-2 mission beckons history.

Indian Space Research Organisation to launch first launch of a Small Satellite Launch Vehicle . The launch will take place on Sunday at 4.18 hours with the launch pad at Satish Dhawan Space Center, Sriharikota, at the time .

NEW DELHI: The Indian Space Research Organisation (ISRO) is on the brink of making history as the space agency is set to launch its first SSLV mission, ferrying an earth observation satellite and a student satellite from Sriharikota, about 135 kilometers from here on Sunday.ISRO will make its first launch of a Small Satellite Launch Vehicle (SSLV), after carving a niche on successful mission launches with its trusted workhorse Polar Satellite Launch Vehicles (PSLV) and Geosynchronous Launch Vehicle (GSLV).Over the past few weeks, scientists at the ISRO have been working on small launch vehicles to meet demand for such small satellites, which weigh up to 500 kg and can be carried into a 500-kilometer low earth orbit.The SSLV is 34 meters tall, about 10 meters shorter than the PSLV, and it has a two-meter vehicle diameter as compared to 2.8 meters of PSLV.

SSLV will fly Earth Observation Satellite -02 and a co-passenger satellite AzaadiSAT, which was developed by the student team of Space Kidz India on Sunday's mission.The countdown time to other missions, which would have been 25 hours, has been reduced to five hours, according to ISRO sources, and was set to begin on Sunday at 4.18 hours with the launch pad at Satish Dhawan Space Center, Sriharikota, at the time.SSLV has the fourth stage, which includes a liquid propulsion based Velocity Trimming Module, to guide the satellites into the intended orbit.To launch the first three stages, the rocket uses solid fuel.

It is a subset of the micro-satellite class of spacecraft.SSLV is expected to start with the EOS-02 in the planned orbit after about 13 minutes, followed by AzaadiSAT, an eight-kg Cubesat invented by schoolgirls around the country to commemorate the 75th anniversary of independence.SSLV, according to ISRO, has a low turn-around time, is able to handle multiple satellites, is available on-demand, and has no requirement for a high-speed launch system.The AzaadiSAT carries 75 different payloads each weighing around 50 gms.

The data from this satellite will be captured by the ground system developed by Space Kidz India.In 1965, ISRO began launching sounding rockets to explore the upper atmosphere and for space exploration.In November 1963, the first sounding rocket was launched near Thiruvananthapuram.Later in 1980, the United States' first Satellite Launch Vehicle -3, which can carry payloads of up to 40 kilograms, was unveiled by the space agency.

In September 1993, ISRO launched its first Polar Satellite Launch Vehicle, but it was a failure.ISRO, on the first successful launch, achieved great success in 1994, when it became known as a reliable and versatile workhorse.In 2001, ISRO launched the first flight of its Geosynchronous Satellite Launch Vehicle, which is India's largest launch vehicle currently operating.The GSLV has a lift-off capacity of 414.75 tonnes.