In its fifteenth mission carried out from Satish
Dhawan Space Centre SHAR (SDSC SHAR), Sriharikota today (April 20, 2009),
ISROs Polar Satellite Launch
Vehicle (PSLV-C12) successfully placed two satellites - RISAT-2 and
ANUSAT - in the desired orbit.
RISAT-2 is a Radar Imaging Satellite with the
capability to take images of the earth during day and night as well as cloudy
conditions. At the time of
launch, RISAT-2 weighed about 300 kg and was realised by ISRO in association
with Israel Aerospace Industries. The satellite was placed in an orbit of 550
km height with an inclination of 41 deg to the equator and an orbital period of
about 90 minutes. This satellite will enhance ISROs capability for earth
observation, especially during floods, cyclones, landslides and in disaster
management in a more effective way.
The 44 metre tall PSLV-C12 weighing 230 ton was
launched from the Second Launch Pad (SLP) at SDSC SHAR in the Core Alone
configuration without the use of six solid strap-ons. In this mission, in
addition to RISAT-2, PSLV also carried A 40 kg micro satellite named ANUSAT,
built by Anna University, Chennai. ANUSAT is the first experimental
communication satellite built by an Indian University under the over all
guidance of ISRO and will demonstrate the technologies related to message store
and forward operations.
Integration of PSLV for the C12 flight commenced
at the Second Launch Pad in SDSC, SHAR on February 26, 2009. Following this,
the first, second, third and fourth stages of the vehicle along with the
satellites were fully integrated. After a 48 hour countdown, the vehicle and
the satellites successfully underwent various levels of functional checks at
the launch centre.
In this flight, PSLV carried the indigenously
developed Advanced Mission Computers and Advanced Telemetry System, which
guided the vehicle from lift-off till the injection of the two satellites in
the desired orbit.
PSLV-C12 lifted off from the Second Launch Pad at
6:45 am IST (0115 UT) today with the ignition of its first stage. The important
flight events included the separation of the first stage, ignition of the
second stage, separation of the payload fairing at about 115 km altitude after
the vehicle had cleared the dense atmosphere, second stage separation, third
stage ignition, third stage separation, fourth stage ignition and fourth stage
The main payload, RISAT-2, was the first
satellite to be separated in orbit at 1100 seconds after lift-off at an
altitude of 550 km. About 60 seconds later, ANUSAT was separated.
With this successful launch, the versatility and the reliability of PSLV has
been proved again underscoring its importance as the workhorse launch vehicle
of India. Todays launch was the fourteenth consecutive success for PSLV. In
these launches, PSLV has placed a total of sixteen Indian satellites and
sixteen foreign satellites into Polar, Geosynchronous Transfer and Low Earth
Orbits. It may be recalled that during its previous mission on October 22,
2008, PSLV had successfully launched Chandrayaan-1 spacecraft, which is now
exploring the moon from lunar orbit.