The ISRO had earlier said Chandrayaan-2 will be launched in a window from January-February 16, 2019.Sources said it is expected by the middle of next month but no date has been finalised.
Indian Space Research Organisation will announce a revised launch date later.
The feat is the second one for the Indian Space Research Organisation scientists in using the indigenously made cryogenic stage after the January 5, 2014 launch of GSLV-D5.
The Indian Space Research Organisation said that the countdown started at 6.51 am on Sunday.
Global analysts say a successful launch of operational GSLV MkII rocket will reduce dependency for ISRO on foreign launchers.
The BJP hit back accusing the Congress of drawing the issue into political arena.
India's first exclusive defence satellite GSAT-7 was successfully launched by European space consortium Arianespace's Ariane 5 rocket from Kourou spaceport in French Guiana on Friday, giving a major push to the country's maritime security.
The success of the PSLV-C34 mission is a result of ISRO's professionalism and the hard work put in by their scientists over the last many decades., says Ajay Lele.
The rocket can put satellites weighing upto four tonnes in space, double the weight that the current GSLV-Mark-II can lift.
The satellite will enable a full range of services to neighbours including the areas of telecommunication, television, direct-to-home, VSATs, tele-education and tele-medicine.
If successful, this would increase capacity to hurl small satellites into space, meeting both local demand and serving global customers.
PSLV C-29 blasted off from the Satish Dhawan Space Centre, about 110 km from Chennai, at 6 pm and released the six satellites one by one into a 550 km circular orbit.
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There appears to be uncertainty over availability of a lander from Russia even as the 'desi' rocket to launch the space odyssey would take time to become operational.
With the launch of GSLV-MK III, slated for April, it will be able to cater to bigger satellites as well.
NASA said it is looking forward to explore the solar system with its Indian counterpart.
ISRO needs next generation launchers and new facilities to manufacture and launch them.
The Mars mission is overwhelmingly irrelevant to space science and won't advance the frontiers of knowledge. It will divert attention from the real technological challenges facing the Indian space programme, and will further distort our science and technology priorities, says Praful Bidwai.
A truly 'made in India' satellite that will empower a digital India.
Noting that the PSLV was a versatile launch vehicle which can do different jobs and put satellites in different orbits, he said streamlining of this operation with improved capabilities is on.
It is important for India to develop multiple launch sites and become capable of undertaking more launches in a year's time, says Ajey Lele.
Godrej and some other firms are frustrated at what they say is the slow execution of projects and lack of government support, which are hampering India's efforts to compete with China and Russia as a cheaper option for launching satellites.
An industrial house bred in old-school manufacturing values, Godrej & Boyce has displayed unusual agility to become a trusted builder of advanced weaponry, discovers Ajai Shukla.
Pride is all ours and of those who made a beeline to Halls 3 and 5 that showcased indigenous defence technologies at the Make In India Week.
It has already tasted success with the moon mission and Mangalyaan. Is man in space the next frontier for ISRO?
