Chandrayaan- 2 & 3

Flyaway

Flyaway

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A. S. Kiran Kumar, the chairman of the Indian Space Research Organisation (ISRO), has recently revealed that Chandrayaan-2 – India’s second mission to the Moon – will be ready for launch sometime in the first quarter of 2018, noting that the spacecraft is currently in its final stages of integration.

“Things are going on. The orbiter is getting ready. Flight integration activity is going on, and a series of tests are planned for lander and rover. They are all in progress and we are working towards the first quarter (of 2018) launch of Chandrayaan-2,” Kumar told Indian news agency PTI.
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Read more at http://www.spaceflightinsider.com/o...nched-first-quarter-2018/#hTGFV8MHH5S8PKj8.99
 
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Despite it crashed while trying to land on the Moon it made more than 4400 revolutions around the Moon. With the help of the probe's cameras, a map of the lunar surface with an area of almost 4 million square meters was built. km.
 
Forrest White said:
Despite it crashed while trying to land on the Moon it made more than 4400 revolutions around the Moon. With the help of the probe's cameras, a map of the lunar surface with an area of almost 4 million square meters was built. km.
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I did not know that Chandrayaan-1 managed to photograph almost 4 million square metres of the Moons surface before it sadly crashed, lets hope that they have more success with Chandrayaan-2 and that it manages to land on the Moon.
 
A very close conjunction between Chandrayaan-2 Orbiter (CH2O) and Lunar Reconnaissance Orbiter (LRO) of NASA was expected to occur on 20 Oct 2021 at 05:45 UTC (11:15 am IST) near the Lunar North pole. Over a span of one week prior to the conjunction, analyses by both ISRO and JPL/NASA consistently showed that the radial separation between the two spacecraft would be less than 100 m and the closest approach distance would be only about 3 km at the aforementioned time of closest approach. Both the agencies deemed that the situation warranted a collision avoidance manoeuvre (CAM) to mitigate the close approach risk, and it was mutually agreed that CH2O would undergo the CAM.
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Chandrayaan-2 Orbiter (CH2O) performs an evasive manoeuvre to mitigate a critically close approach with LRO - ISRO

A very close conjunction between Chandrayaan-2 Orbiter (CH2O) and Lunar Reconnaissance Orbiter (LRO) of NASA was expected to occur on 20 Oct 2021 at 05:45 UTC (11:15 am IST) near the Lunar North pole. Over a span of one week prior to the conjunction, analyses by both ISRO and JPL/NASA...
www.isro.gov.in www.isro.gov.in
 
Rather than start a new thread I’ve re-named this one.

India targets August launch for Chandrayaan-3 lunar lander [dated Feb. 3]

“Based on the learnings from Chandrayaan-2 and suggestions made by the national level experts, the realization of Chandrayaan-3 is in progress,” India’s science and technology minister, Jitendra Singh, said in a Feb. 2 statement. “Many related hardware and their special tests are successfully completed. The launch is scheduled for August 2022.”

Chandrayaan-3 is planned for launch from India’s Satish Dhawan Space Center aboard Geosynchronous Satellite Launch Vehicle Mark III rocket.
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The Chandrayaan- 2 failed as the Closed Loop Guidance wasnt properly working. There was a particular algorithm which wasn't tested for the extreme ends where during the phase transitions the code didn't accept a wider boundary input. Essentially for the C-2, there was veyr minimal fault tolerance. Hopefully they learnt from this for the Ch-3

"...There is a continuous use of propellant..the mass is continuously changing. So thrust should be continuously changing. A continuously throttlable engine is needed. We were not able to make such an engine. So we have gone for step-by-step i.e. 40% throttling, then 60%, 80% and 100% throttling and make it to zero vessel velocity. In 60% or 80% throttling, what we actually planned was not sufficient. So the velocity was more than expected because continuous throttling was not possible. Up to 2.1 km, we were dot on spot but beyond that, the velocity was slightly more than what we expected. There was a small control and guidance problem. Closed Loop Guidance was not working properly. There was an algorithm which wasn't tested for the extreme ends.

In Chandrayaan-3, we're going to (inaudible) the engine to the maximum limits. We will go for little more discrete throttling- 10% throttling instead of 20%"
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View: https://www.youtube.com/watch?v=Uj83m2fdvAc&t=2002
 
Chandrayaan-3 undergoes EMI/EMC test successfully


Feb 19, 2023

Chandrayaan-3 lander successfully underwent EMI/EMC test during Jan 31, 2023 - Feb 02, 2023, at U R Rao Satellite Centre, Bengaluru.

EMI-EMC (Electro - Magnetic Interference/ Electro - Magnetic Compatibility) test is conducted for satellite missions to ensure the functionality of the satellite subsystems in the space environment and their compatibility with the expected electromagnetic levels. This test is a major milestone in the realization of the satellites.

Chandrayaan-3 interplanetary mission has three major modules:the Propulsion module, Lander module, and Rover. The mission's complexity calls for establishing radio-frequency (RF) communication links between the modules.

During the Chandrayaan-3 lander EMI/EC test, Launcher compatibility, Antenna Polarization of all RF systems, Standalone auto compatibility tests for orbital and powered descent mission phases, and Lander & Rover compatibility tests for post landing mission phase were ensured. The performance of the systems was satisfactory.
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Flyaway said:
https://twitter.com/x/status/1630474227634798592
View: https://twitter.com/isrospaceflight/status/1630474227634798592


ISRO has successfully completed the flight acceptance test of the CE-20 engine that will be used on the LVM3-M4/Chandrayaan-3 mission!! It was a 25 sec duration test carried out on 24 Feb.

A Jul-Aug '23 launch of CY-3 is still very much on the cards! #ISRO #Chandrayaan3
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Let's see if they can keep to the launch window, I wish them all the best with CY-3.
 
Actual launch date for Chandrayaan-3 appears to be the 12th July.

https://twitter.com/x/status/1664220738608578561
View: https://twitter.com/chethan_dash/status/1664220738608578561


#JUSTIN #Thread

@isro URSC director M Sankaran today said the #Chandrayaan3 spacecraft, which Isro is aiming to launch mid-July, has reached the spaceport and that the agency has taken all precautions to ensure that the mission is successful. 1/n
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“After the final assembly of payloads at URSC in Bengaluru, the spacecraft has reached Sriharikota and preparation is going… We do expect that sometime in July the launch can take place.” 2/n
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economictimes.indiatimes.com

Primary objective is a 'sure-shot safe mission': Not in a hurry to launch Gaganyaan, asserts ISRO chief

The space agency has redefined the mission in such a way that it will achieve success in the very first attempt. For this, it has enhanced the testing and demonstration mission substantially in recent times. These exercises involve additional abort missions to ensure the safety of the crew, ISRO...
economictimes.indiatimes.com economictimes.indiatimes.com

Regarding Chandrayaan-3, ISRO's third moon mission, Somanath said it is due to be launched in mid July. ISRO will follow the same process that was adopted during the Chandrayaan-2 mission, he said.

"We are going in the same path of Chandrayaan-2 because we have already done that. We have experience to do it in that manner but it all depends on various other factors whether there are any other contingency conditions," Somanath said, adding, "The landing flight is just the same as previously. No change."

To a query on how indigenous Chandrayaan-3 is, the ISRO chairman said, "What we are doing in ISRO is 100 per cent indigenous. We are not buying anything from anybody to do it but of course we buy some components such as electronic chips, processors, some high-end devices, but we don't buy Chandrayaan lander from anybody."
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Good to see that Chandrayaan 3 is in good health and is in contact with ground control.
 
Wow! Deino, nice find. All we need now is for the orbiter to return much better higher resolution images than the two that have been sent so far.
 

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