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Chandrayaan-II, All Chandrayaan-II related articles
Hungry4info
post Sep 3 2021, 09:13 PM
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Slightly higher quality.
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threadworm
post Sep 6 2021, 04:03 PM
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It may well be worth tuning in to this:

https://www.youtube.com/watch?v=fF7vdqDfOwU

scheduled for 05:30 GMT on the 7th of September.
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Ohsin
post Sep 7 2021, 06:50 AM
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PRL hosted portal for XSM payload with near real-time data plot.
https://www.prl.res.in/ch2xsm/
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threadworm
post Sep 8 2021, 06:44 AM
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The presentation wasn't what I'd hoped, and no real clues as to when more data will be released, but for what it's worth there are three documents available here with scientifric results in them:

https://www.isro.gov.in/chandrayaan-2-scien...oduct-documents

Of the three, the larger third document is probably of more interest, as it contains much of the other two and more pretty pictures smile.gif
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threadworm
post Sep 22 2021, 04:15 PM
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Another couple of hundred TMC files released today.
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threadworm
post Sep 22 2021, 09:22 PM
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A nice feature they've released along with the files is a collection of shape files - there are links on the TMC and OHRC browse and download pages.

Those shape files can be imported into Google Earth, which is a much easier way of seeing where they've covered!
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Ohsin
post Sep 23 2021, 06:42 PM
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These shapefiles can be imported as a layer into Quickmap as well!

https://quickmap.lroc.asu.edu/

Meanwhile in another webinar they shared OHRC image of Apollo-12 landing site taken on 5 April 2021.

https://youtu.be/vQj6oKgKeKc (Reddit thread)

Another slide gives rough location of possible sites. Compared with OHRC shape files it kind of narrows down location to match-up this visual of probable landing site of Chandrayaan-3 lander (~115×92 meters)


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Phil Stooke
post Sep 24 2021, 06:25 AM
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Very interesting. Thanks for pointing it out. I see that another part of the presentation had a map with two points representing the Chandrayaan 3 landing sites (prime and backup), and they are not the same as the Chandrayaan 2 sites. They are both fairly close to the CH2 prime site but far from the CH2 backup site. That map is very low resolution but if it is superimposed on the original US Air Force mosaic which was its base the sites can be located better:

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And with a bit of a mind-flip we get this:

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I hope to learn more about the specific sites closer to launch.


Phil



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Ohsin
post Sep 24 2021, 07:28 AM
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Yes Phil I should've mentioned that and we discussed it on reddit, those blue dots are what narrowed down the relevant OHRC data regions and provide clues to where we should look for CY3 landing site.
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Phil Stooke
post Sep 24 2021, 03:32 PM
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I didn't notice the Reddit discussion - thanks. So it looks like my southern dot should be inside Boguslowsky crater. I moved it from the rim to a more level spot outside but I should have gone inside.

Phil


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threadworm
post Oct 6 2021, 03:31 PM
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Another few hundred files released yesterday from the TMC camera. The updated collection of shape files show most of the new coverage is the far side, and higher northern/southern latitudes.
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Ohsin
post Nov 15 2021, 11:22 AM
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https://www.isro.gov.in/update/15-nov-2021/...gate-critically

QUOTE
Nov 15, 2021
Chandrayaan-2 Orbiter (CH2O) performs an evasive manoeuvre to mitigate a critically close approach with LRO
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. The manoeuvre was scheduled on 18th October 2021, it was designed to ensure a sufficiently large radial separation at the next closest conjunction between the two spacecraft. The CAM was executed nominally at 14:52 UTC (8:22 pm IST), on October 18th. After orbit determination of CH2O with post-manoeuvre tracking data, it was reconfirmed that there would be no further close conjunctions with LRO in the near future with the achieved orbit.

It may be noted that like CH2O, LRO orbits the Moon in a nearly polar orbit and hence, both the spacecraft come close to each other over the Lunar poles. It is common for satellites in Earth Orbit to undergo Collision Avoidance Manoeuvres to mitigate collision risk due to space objects including space debris and operational spacecraft. ISRO regularly monitors such critical close approaches and execute CAMs for its operational satellites whenever the collision risk is assessed to be critical. However, this is the first time such a critically close conjunction was experienced for a space exploration mission of ISRO which necessitated an evasive manoeuvre.

The event highlights the importance of continual assessment of close approach situations for Lunar and Martian missions, and the fact that effective mitigation of close approach risk involves close coordination and synergy among different space agencies.

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Steve G
post Feb 4 2022, 01:29 AM
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There's no section yet for Chandrayaan III, but launch is set for this August.

https://spacenews.com/india-targets-august-...3-lunar-lander/
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Ohsin
post Feb 4 2022, 02:24 AM
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Spacenews linking to tweet as source. Here are official links.

http://164.100.24.220/loksabhaquestions/annex/178/AU59.pdf

https://pib.gov.in/PressReleasePage.aspx?PRID=1795030

And per discussion above landing site is not same as the SN article suggests.
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threadworm
post Feb 22 2022, 08:46 AM
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OHRC update covers the Apollo 11 and 12 sites:



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