Chandrayaan-2 (Moon vehicle 2) entered the Moon's orbit on 20 August and was due to land on the lunar surface a little after midnight India local time (18:0pm) on 7 September - a month after it first shot into space.
Contact was lost at the moment before the lander was expected to touch down at the lunar south pole.
The orbiter has since discovered the lander on the lunar surface, but scientists have yet to be able to connect with it.