India's space-based solar observatory Aditya-L1 will be given a send off signal on September 19 when the spacecraft will be maneuvered to Trans-Lagrangian Point 1 Insertion (TL1I), the Indian Space Research Organisation (ISRO) said on Friday.

According to the ISRO, the fourth Earth-bound maneuver was performed successfully at 2.15 a.m. on Friday.

Send off towards the Sun for Aditya-L1 spacecraft on Sep 19: ISROIANS

"ISRO's ground stations at Mauritius, Bengaluru, SDSC-SHAR and Port Blair tracked the satellite during this operation, while a transportable terminal currently stationed in the Fiji islands for Aditya-L1 will support post-burn operations," the space agency said.

According to ISRO, the new orbit attained is 256 km x 121973 km. ISRO said the next maneuver, Trans-Lagrangian Point 1 Insertion (TL1I) -- a send-off from the Earth towards Sun -- is scheduled for September 19 at around 2 a.m.

The Aditya-L1 is India's space based solar observatory which was orbited in low earth orbit (LEO) September 2 by an Indian rocket called Polar Satellite Launch Vehicle–XL (PSLV-XL) variant.

Nigar Shaji, A Woman ISRO Scientist Helmed Aditya-L1 Mission
Nigar Shaji, A Woman ISRO Scientist Helmed Aditya-L1 MissionIANS

The spacecraft's orbit has been raised by ISRO four times since then. As the spacecraft travels towards Lagrange Point (L1), it will exit the earth's gravitational Sphere of Influence (SOI).

After exit from SOI, the cruise phase will start and subsequently the spacecraft will be injected into a large halo orbit around the L1 -- the point where the gravitational pull of two large bodies - Sun and Earth - will be equal and hence the spacecraft will not gravitate towards any one of the planet.

The total travel time from launch to L1 would take about four months for Aditya-L1 and the distance will be about 1.5 million km from the Earth.

(With inputs from IANS)