The second orbit-raising manoeuvre of
Chandrayaan-1 spacecraft was carried out at 05:48 hrs IST this morning
(October 25, 2008) when the spacecrafts 440 Newton Liquid Engine was fired for
about 16 minutes by commanding the spacecraft from Spacecraft Control Centre
(SCC) at ISRO Telemetry, Tracking and Command Network (ISTRAC) at Peenya,
Bangalore. With this
engine firing, Chandrayaan-1s apogee has been further raised to 74,715 km,
while its perigee has been raised to 336 km. In this orbit, Chandrayaan-1
spacecraft takes about twenty-five and a half hours to go round the Earth once.
This is the first time an Indian spacecraft has gone beyond the 36,000 km high
geostationary orbit and reached an altitude more than twice that height.
It may be recalled that Chandrayaan-1, Indias first spacecraft to Moon, was
successfully launched by PSLV-C11 on October 22, 2008 from Satish Dhawan Space
Centre SHAR, Sriharikota. The launch vehicle placed Chandrayaan-1 in an
elliptical orbit with a perigee (closest point to earth) of 255 km and apogee
(farthest point to earth) of 22,860 km. The first orbit-raising manoeuvre was
performed on October 23, 2008 by firing the spacecrafts liquid engine for 18
minutes resulting in the increase of the spacecraft orbits apogee to 37,900 km
and the perigee to 305 km. The Indian Deep Space Network (IDSN) at Bylalu is
tracking the spacecraft in the present orbit, receiving signals in S and X
bands and is sending commands to the spacecraft.
All systems onboard the spacecraft are functioning normally. Further orbit
raising maneuvers to take Chandrayaan-1 to still higher orbits are planned in
the next few days.