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The orbiter lifted off from the Satish Dhawan Space Centre in Sriharikota in November 2013
India's maiden mission to Mars, the Mangalyaan has been on a 300-day marathon covering over 670 million kilometres (420 million miles). Science writer Pallava Bagla traces its journey as it nears its planned arrival in orbit.
On the morning of 24 September, the Indian Space Research Organisation (Isro) will slow down the spacecraft sufficiently so that it can be caught in the orbit of Mars.
If that happens, "India will become the first Asian country to have achieved this and if it happens in the maiden attempt itself, India could become the first country in the world to have reached distant Mars on its own steam in the first attempt," explains Isro chairman K Radhakrishnan.
Both Russia and the US failed in their maiden attempts. The first Chinese mission to Mars called Yinghuo-1 failed in 2011 alongside the Russian Phobos-Grunt mission with which it was launched. Earlier in 1998, the Japanese mission to Mars ran out of fuel and was lost.
Undoubtedly, India - a late starter - is way ahead of its Asian rivals in trying to get to the Red Planet.
Says Mr Radhakrishnan: "We are really not racing with anyone, but with ourselves to reach the next level of excellence."
'Pink of health'
India's Mars Orbiter Mission (MOM) - an indigenously made unmanned robotic mission weighing 1,350kg (2,976lb) - was launched from the rocket port at Sriharikota on the coast of the Bay of Bengal on a balmy afternoon on 5 November last year.
Since then, the mission "has been in the pink of health", says Isro, and has been cruising at breakneck speed to reach close to Mars, half-way around the Sun.
The health of Mangalyaan is monitored from Isro's Mars mission control complex in Bangalore
The 4.5bn rupee ($74m; £45m) mission is, as Mr Radhakrishnan says, "the cheapest inter-planetary mission ever to be undertaken by the world".
On his visit to India's rocket port on 30 June, Prime Minister Narendra Modi said: "The [making of the] Hollywood movie Gravity cost more than our Mars mission - this is a great achievement."
India's low-cost and quick turnaround satellite mission has been attracting a lot of global attention from the scientific community that seeks to better understand the mysterious Mars.
On the morning of 24 September, Isro will re-orient Mangalyaan and fire its on-board rocket motor for about 24 minutes to slow the spacecraft.
It's a very tricky operation - if it does not slow down sufficiently, it will miss being caught by the gravity of Mars and the mission could be lost in outer space; but if the rocket engine fires more than required it could slow the Mangalyaan so much that it could go crashing down on to the red soil of Mars.
Since 1960, there have been 51 global missions to Mars and the overall success rate stands at 42% so the odds are loaded against the Indian Martian entry.
M Annadurai, head of the Indian Mars mission, says: "We are confident that the laws of physics will favour India and the country could have its first robotic Martian baby soon."
'Delusional dream?'
Isro dubs the mission a "technology demonstrator", essentially showcasing to the world that India is no longer a country of snake charmers but a high-tech hub that has developed its technology against the odds and stringent sanctions.
If Mangalyaan indeed reaches Mars, it would also make a big global geo-political statement ahead of Mr Modi's imminent visit to the US.
In its six-month life, the mission will study the atmosphere of Mars and search for methane gas while asking that eternal question that has dogged humanity: "Are we alone in the universe?"
Within hours of its arrival in the orbit, the spacecraft is expected to relay the first images taken by an Indian eye of the Red Planet and help decipher why and how Mars lost its liquid water.
These are important questions essential for the long-term survival of human beings on Earth.
In the sprint for the Martian marathon, India has shown its technological capability and resilience to undertake arduous inter-planetary journeys.
Many, however, say this bid to reach Mars is a "delusional dream" of India seeking super-power status since 400 million Indians still live without electricity and 600 million people still do not have access to toilets.
However, in real terms, the Mangalyaan has cost India just about four rupees (seven cents; four pence) per person - which is chicken feed for a country of 1.2 billion people.
India sees the Mars mission as an opportunity to beat its regional rival China in reaching the planet, and with destination Mars within touching distance, it may after all meet that target.
BBC News - Mangalyaan: Will India's Mars mission reach the orbit?
