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Questions tagged [chandrayaan-spacecraft]

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6 votes
1 answer
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Comparing Japan's SLIM and India's Chandrayaan-3 trajectories

I was reading this SpaceNews article on the launch, which states: SLIM won’t be taking a direct route to the moon. After a lunar transfer orbit burn, it will make a lunar flyby, heading into a wide ...
fyrepenguin's user avatar
  • 1,670
6 votes
2 answers
2k views

How did sulphur come up to the surface of the moon?

We know that the Chandrayaan-3 mission found the presence of sulphur on the surface of the moon. How did it come up to the surface of the moon if this element is supposed to be in the moon's core ...
Amal's user avatar
  • 164
2 votes
0 answers
264 views

Why didn’t Apollo 11 blown away the dust as we can see only rocky surface in the Chandrayaan-3 landed picture? [duplicate]

Source: https://images.indianexpress.com/2023/08/An-ISRO-image-of-the-Chandrayaan-3-landing-site-taken-after-touchdown.-One-of-the-four-legs-of-the-lander-is-visible-on-the-right-1.jpg?w=414 If you ...
ASHOK KARUMANCHI's user avatar
13 votes
3 answers
4k views

Why do we need to make probes land on other planets or moons?

This is a very dumb question but I am really curious to know the answer. Today I was watching the live streaming of Chandrayan 3 landing on the moon (which it successfully did) and this question came ...
Ankit's user avatar
  • 265
11 votes
2 answers
3k views

Why do the more recent landers across Mars and Moon not use the cushion approach?

I was wondering why the (relatively) recent Perseverance (USA), Chandrayaan-2,3 (India) and Luna-25 (Russia) don't leverage the advantage of the cushion based approach that Spirit, Opportunity, and ...
Ravindra HV's user avatar
8 votes
1 answer
212 views

Chandrayaan landing ellipse size and rationale

From what I hear about the Chandrayaan-2 failure analysis, the spacecraft overshot its landing ellipse and, while struggling to backtrack, crashed. I have been wondering why they had specified a ...
John McCarthy's user avatar
2 votes
1 answer
153 views

Was Chandrayaan-1 recovered (tracked) only that one time in 2016, or is someone still keeping an eye on it from time to time?

Has there ever been probability of conjunction between spacecrafts in Lunar orbit? describes a recent maneuver of two spacecraft in orbit around the moon to avoid a potential collision: Apparently ...
uhoh's user avatar
  • 149k
10 votes
1 answer
303 views

What went wrong in the Chandrayaan-2 mission with the Vikram lander?

On September 7th 2019, ISRO attempted to land a lunar lander ,Vikram, with rover , Pragyan, on the moon. It was very exciting to watch until the lander lost communication with ground station during ...
John's user avatar
  • 1,377
2 votes
1 answer
261 views

Trajectory Optimization To The Moon (Case Study: Chandrayaan-2)

People always ask this million dollar question of " What is the best path/trajectory to take to reach a certain orbit or point in space". Chandrayaan-2 had a pretty neat transfer to the moon, it took ...
John's user avatar
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7 votes
3 answers
764 views

Why is the Duration of Time spent in the Dayside greater than that of the Night side of the Moon for Chandrayaan-2 Orbiter?

The following information is from ISRO's webpage on "Detection of Argon-40 in the lunar exosphere" (Textual information relevant to my question is in bold face): The Chandra’s Atmospheric ...
Vishnu's user avatar
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9 votes
2 answers
2k views

Why would thermal imaging be used to locate the Chandrayaan-2 lander?

Tweets and news suggest that Chandrayaan-2 lander may have been located, using thermal imaging by the Chandrayaan-2 orbiter. Space.com: India Just Found Its Lost Vikram Lander on the Moon, Still No ...
uhoh's user avatar
  • 149k
3 votes
1 answer
249 views

What does Cees Bassa's Doppler plot of Chandrayaan 2 show?

Cees Bassa's tweet shows a plot of received frequency versus time, with the Doppler shift of the Moon's center of mass subtracted. For a lunar orbit the resulting plot would show sinusoidal-like ...
uhoh's user avatar
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5 votes
2 answers
257 views

Chandrayaan 2: How has life of the orbiter increased from 1 year to more than 7 years?

https://timesofindia.indiatimes.com/india/chandrayaan-2-orbiter-has-life-of-7-yrs-95-of-mission-accomplished-isro/articleshow/71026990.cms The ISRO Chairman has reported that the economic use of fuel ...
shreyase99's user avatar
6 votes
1 answer
1k views

Chandrayaan 2: Why is Vikram Lander's life limited to 14 Days?

I do know that the 13-14 days of its scheduled life is limited by the duration of sunlight and once the far side of the moon goes dark, the lander will be in temperatures as low as -170° Celsius. But ...
shreyase99's user avatar
40 votes
4 answers
7k views

Are there any space probes or landers which regained communication after being lost?

Recently, ISRO Vikram lander of Chandrayaan 2 lost its communication just before 2.1 km from lunar surface. ISRO staff still trying to regain the signals. Are there any space probes/landers which ...
Junaid Ahmed's user avatar
7 votes
1 answer
511 views

What are the operating systems and network stack in the Chandrayaan - 2 vehicles?

I am trying to find the information about the operating systems that are run in all of the Chandrayaan - 2 vehicles, the orbiter, lander and Rover. Are these just firmwares? Or how are different ...
soham's user avatar
  • 171
8 votes
1 answer
378 views

Did the cold temperature of the lunar south pole cause Chandrayaan-2's on board electronics to fail?

Chandrayaan-2's lander Vikram was performing nominally during descent until about 2 km before landing, but then suddenly the communication was lost. Did cold temperature of the lunar south pole cause ...
earthProgrammer's user avatar
16 votes
1 answer
574 views

Is there any way to determine the fate of Chandrayaan-2?

The lander Vikram of Chandrayaan-2 lost contact with ISRO shortly before an expected landing. Is there any way to find out if it landed without crashing? For example, are there satellites orbiting ...
William R. Ebenezer's user avatar
1 vote
1 answer
252 views

Two consecutive high profile Moon landings fail, any common threads?

For the second time in a few months, we have seen a Moon landing fail at the last moment as computer communications failed. The Beresheet failure is well addressed here; did a similar thing happen ...
Oscar Lanzi's user avatar
  • 8,525
5 votes
1 answer
242 views

How will Chandrayaan-2 reach a polar orbit?

This Wikipedia article says the the Chandrayaan-2 orbiter will be in a polar orbit above the moon. The orbiter will perform its mission for one year in a circularized lunar polar orbit of 100 × 100 ...
Star Man's user avatar
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1 vote
1 answer
897 views

Does Chandrayaan 2 use gravity assist?

All of the descriptions I've seen online describing Chandrayaan-2's path to the Moon either explicitly or implicitly describe it involving a "gravity assist": The spacecraft will make use of the ...
orome's user avatar
  • 368
1 vote
2 answers
547 views

Chandrayaan-2 orbiter and lander communications with Earth (IDSN)

In the Seeker video India Could Be the First to Land on the Moon’s South Pole a bit after 04:20 the narrator says: Okay, well right about now you’re probably ...
uhoh's user avatar
  • 149k
10 votes
2 answers
536 views

Why is the Chandrayaan lunar insertion so long?

The Chandrayan take 5 earth orbit modifications to reach a translunar trajectory. I thought less orbit modifications should be enough: orbit inclination modification burns to go into a ...
Manu H's user avatar
  • 3,790
23 votes
1 answer
6k views

ELI5: Why do they say that Israel would have been the fourth country to land a spacecraft on the Moon and why do they call it low cost?

In the news they say that Israel hoped to become the fourth country to land a spacecraft on the Moon. Only government space agencies from the former Soviet Union, the US and China have made ...
Vladislav Gladkikh's user avatar
3 votes
1 answer
1k views

Are low, polar lunar orbits in general relatively stable?

The Phys.org article New NASA radar technique finds lost lunar spacecraft describes the use of radar to relocate two spacecraft that were in orbit around the moon but who's orbit had not been actively ...
uhoh's user avatar
  • 149k
12 votes
4 answers
900 views

Why was the 100m Green Bank dish needed together with DSN's 70m Goldstone dish to detect Chandrayaan-1 in lunar orbit?

The Phys.org article New NASA radar technique finds lost lunar spacecraft describes the use of radar to relocate two spacecraft that were in orbit around the moon but who's orbit had not been actively ...
uhoh's user avatar
  • 149k
5 votes
0 answers
242 views

What was Chandrayaan-1's ground track?

I was looking for a map of Chandrayaan-1's ground track, but I wasn't able to find one. I'm looking for something like this:              &...
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