ISRO Chandrayaan 2 Launch Today: Answers to all your questions on India's second Moon mission

All your burning questions pertaining to Chandrayaan 2, its payloads, onboard modules answered

India’s second unmanned mission to the Moon, named Chandrayaan 2, is all set to take off on 22 July, provided the weather conditions are ideal. After the success of Chandrayaan-1 and the host of other satellite launches since, the expectations from Chandrayaan 2 are quite high. 

With Chandrayaan 2, in a first for India, ISRO will be depositing a lander and rover on the surface of the Moon. There is a lot to unpack, so let’s dive right into it. The aim is to make this your one-stop-shop for everything Chandrayaan 2.

ISRO staff working on the Vikram Lander from the Chandrayaan 2 mission at the ISRO Satellite Integration and test establishment (ISITE), in Bengaluru. Image: PTI.

ISRO staff working on the Vikram Lander from the Chandrayaan 2 mission at the ISRO Satellite Integration and test establishment (ISITE), in Bengaluru. Image: PTI.

What is Chandrayaan 2?

Chandrayaan is an amalgamation of Chandra – Moon and Yaan – vehicle. Chandrayaan-1 was India’s first unmanned mission which was launched in October 2008. Chandrayaan 2 is the second unmanned mission and will launch after almost a decade since the first mission. The ambitions with the second Moon mission are understandably greater.

When and where is the launch of Chandrayaan 2?

The Chandrayaan 2 spacecraft will lift off on 15 July at 0251 hrs from the Satish Dhawan Space Centre at Sriharikota in Andhra Pradesh. The lander and rover are expected to make a Moon landing on 6 September.

ISRO will have a live feed on launch day (technically night) on Doordarshan.  

What are the objectives of Chandrayaan 2?

Chandrayaan 2 is expected to make a soft landing on the unmapped surface of the Moon on the South Pole. This will be the first time any mission touched down so far from the equator, according to a report in Science. One of the primary objectives is to demonstrate the ability to soft-land on the lunar surface. 

Among the scientific objectives, there are experiments that will be conducted to study the lunar topography, mineralogy, elemental abundance, the lunar exosphere and signs for hydroxyl – a molecule involving hydrogen and oxygen which has, among other things, significance when it comes to the search for extraterrestrial life – and water ice on the lunar surface. 

What do you mean by a soft-landing?

A soft landing is actually a technical term to indicate a landing technique that prevents any kind of damage to sensitive instruments onboard. Hard landings are those where damage to the craft or instruments occurs, when an aircraft crash lands, for example. With the onboard central-mounted propulsion system, the lander will make a vertical descent to the predetermined landing site near the South Polar region of the moon.

Configuration of the Chandrayaan-2 mission rover, lander and orbiter (labelled). Image: ISRO

Configuration of the Chandrayaan-2 mission rover, lander and orbiter (labelled). Image: ISRO

What is the duration of Chandrayaan 2?

The scientific experiments will be conducted on the lunar surface for 14 Earth days (1 Lunar day) by the Lander and Rover. The Orbiter will be operational for a year.

Why go to the Moon when we have already been there with Chandrayaan-1?

Well, why not? Chandrayaan 2 mission has different objectives which were not part of Chandrayaan-1, so it makes the mission quite relevant. According to ISRO, in addition to being only the fourth nation (after the US, Russia and China) to be attempting a soft landing on the lunar surface, Chandrayaan 2 will achieve lots of firsts.

  • Chandrayaan 2 will be the first space mission to conduct a soft landing on the Moon's south polar region
  • Chandrayaan 2 will be the first Indian expedition to attempt a soft landing on the lunar surface with home-grown technology
  • Chandryaan 2 will be the first Indian mission to explore the lunar terrain with home-grown technology

The Moon also happens to be a sort of preparation for demonstrating technologies that can be used for further deep space missions. To quote from the ISRO website, "The Moon provides us with the best linkage to Earth's early history and an undisturbed record of the nascent Solar System environment. While a few mature models do exist, the Moon's origin still needs further explanations. Extensive mapping of the lunar surface will aid us in studying variations in its composition — an essential piece of information in tracing the Moon's origin and evolution. Evidence of water molecules — discovered by Chandrayaan 1 — and the extent of its distribution on the lunar surface and sub-surface also require further studies."

So it's clear that a lot still needs to be discovered on the Moon.

The near side (left) and far side (right) of the Moon. The far side has very little maria (plains) due to its relatively thicker, uneven crust. Image courtesy: Wikipedia

The near side (left) and far side (right) of the Moon. The far side has very little maria (plains) due to its relatively thicker, uneven crust. Image courtesy: Wikipedia

How much will Chandrayaan 2 cost?

The total cost of building and testing the Chandrayaan-2 orbiter, lander and rover is Rs 603 crores, according to ISRO chief Dr Sivan. This does not include the cost of building the GSLV-Mk-III rocket. According to Sivan, the mission will be supported by over 500 academic institutions and 120 industries who have contributed around 60 percent of the Rs 603 crore budget and 80 percent of the Rs 375 crore cost of the GSLV Mk-III. That pegs the total cost of the Chandrayaan 2 mission at around Rs 978 crore or around $140 mn.

In terms of cost, how does Chandrayaan 2 compare with other Moon missions?

ISRO is renowned for completing space missions at affordable costs. Mangalyaan, India's mission to Mars, cost less than the amount it took Hollywood to make the movie The Martian. Putting things into perspective, it cost more money for Hollywood to make a movie about sending someone to Mars, than ISRO took for an actual space mission that reached the Red Planet. So here's a table comparing Moon missions.

Mission Name Country Year Cost (in USD)
Chandrayaan 2 India  July  2019 140 mn
Beresheet Israel  February 2019 100 mn
Chang'e 4 China  December 2018 180 mn
TESS USA  April 2018 287 mn
LADEE USA  September 2013 280 mn

What is so significant about the South Pole of the Moon?

It's not explored much. A large section of the lunar South Pole stays under the shadow of the North Pole. There is speculation of water being present there in the permanently shadowed areas around it. Moreover, the South Pole is also said to have cold traps which can contain fossilised information of the early Solar System.

What comprises Chandrayaan 2?

Chandrayaan 2 comprises three modules: The Orbiter, Vikram Lander and Pragyan Rover. According to ISRO, the Orbiter and Lander modules will be having a mechanical interface and will be stacked together as an integrated module inside the GSLV MK-III launch vehicle. 

“The Rover is housed inside the Lander. After launching into Earth-bound orbit by GSLV MK-III, the integrated module will reach Moon orbit using the Orbiter propulsion module. Subsequently, Lander will separate from the Orbiter and soft land at a predetermined site close to the lunar South Pole. Further, the Rover will roll out for carrying out scientific experiments on the lunar surface. Instruments are also mounted on the Lander and Orbiter for carrying out scientific experiments,” according to ISRO. 

Chandrayaan 2 will be carrying 14 payloads: 8 on the Orbiter, 3 on Lander and 2 on Rover. 

Click here for the highlights of ISRO’s Chandrayaan 2 Moon mission.

Chandrayaan Orbiter: Highlights

Chandrayaan 2 orbiter. Image: ISRO

Chandrayaan 2 orbiter. Image: ISRO

  • Weight: 2,379 kg
  • Power generation: Solar arrays capable of generating 1,000 W.
  • Communication: It will communicate with the Indian Deep Space Network and the Lander.
  • Payload: 8 instruments
  • Scientific experiments expected: The Imaging Infra-Red Spectrometer (IIRS) will try to identify minerals and indicators of hydroxyl and water molecules. Other payloads include a visible terrain mapping camera, a neutral mass spectrometer, a synthetic aperture radar, a radio occultation experiment, solar X-Ray monitor and a soft X-Ray spectrometer.

Vikram Lander: Highlights

Vikram Lander. Image: ISRO

Vikram Lander. Image: ISRO

  • Weight: 1,471 kg
  • Power generation: Solar arrays can generate 650 W. 
  • Period of operation: 14 days or 1 Lunar Day. 
  • Communications: It can communicate directly with the Indian Deep Space Network as well as the Orbiter and the Rover. 
  • Payloads: 3 
  • Scientific experiments expected: The first payload is a Langmuir probe, an instrument that can measure the electron temperature, electron density and electric potential of a plasma. It is expected to study and measure the lunar surface plasma environment. A thermal probe onboard will be running the Chandra’s Surface Thermo-physical experiment to measure the vertical temperature gradient and thermal conductivity of the lunar surface. The third payload is a simple seismometer named 'Instrument for Lunar Seismic Activity' or ILSA for short and will be studying lunar quakes. 

For a deep dive on the Vikram Lander read this detailed explainer. 

Pragyan Rover

Pragyan Rover. Image: ISRO

Pragyan Rover. Image: ISRO

  • Weight: 27 kg
  • Power generation: Runs on 50 W of solar power.
  • Period of operation: 14 days or 1 Lunar Day.
  • Communications: Communicates directly with the Lander. 
  • Travel speed: 1 cm per second for 500 metres. 
  • Payloads: 2
  • Scientific experiments expected: Pragyan will have two instruments onboard. The instruments will test mineral and chemical compositions on the surface of the Moon as well as the soil and rocks. Data on and around the South side of the pole will be collected and sent.

For a deep dive on the Pragyan Rover, read this detailed explainer. 

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