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Chandrayaan 1, India's First Lunar Probe
Pradeep
post Dec 15 2010, 05:19 PM
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QUOTE (Nirgal @ Dec 12 2010, 09:40 PM) *
Thanks for the update, Pradeep !

do you have any information when the first data from the Terrain Mapping Camera (TMC) which I am particularly looking forward to smile.gif will be released ?

there is a preview of TMC data published at the ISRO site (link) which looks very very promising (the announced 5-meter-per-pixel near-global DEM would be by far the best topographic map of the moon yet with resolution two times higher than SELENE/KAGUYA DTM and more than ten times higher than LOLA DTM ...


No idea so far on a data release date.

Pradeep


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Paolo
post Dec 15 2010, 06:29 PM
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by the way, there is yet another Chandrayaan-related paper on arXiv today
Extremely high reflection of solar wind protons as neutral hydrogen atoms from regolith in space
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Nirgal
post Dec 27 2010, 03:07 PM
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This news article sounds interesting:

QUOTE (Pradeep @ Dec 15 2010, 06:19 PM) *
ISRO has stated recently, that the voluminous data gathered by Chandrayaan-I would be made available to the public by the end of the year 2010. The data would be eventually split into two seasons with the first season going public by the end of 2010 and the second going public by the mid of 2011. The data would contain rare pictures of the moon and also data from the chemical and mineral mapping of the lunar surface.


Anyone more details on this upcoming end-of-2010 public data release ?

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elakdawalla
post Mar 1 2011, 09:36 PM
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Here it is:
http://www.issdc.gov.in/CHBrowse/index.jsp

I've checked it out and currently there's only browse versions of the data available, and those at pretty high JPEG compression, but it's enough to have some 3D fun with. Remember that TMC, like HRSC, did simultaneous stereo, so every spot it imaged on the Moon can be seen in 3D with minimal effort.


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Nirgal
post Mar 2 2011, 10:14 PM
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QUOTE (elakdawalla @ Mar 1 2011, 10:36 PM) *
Here it is:


Thanks a lot for the update, Emily !

I've been waiting for a long time for this one smile.gif

(Still courious about the Kaguya Terrain Camera data though which is still not (or only partially) released to date)
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Marz
post Apr 15 2012, 08:20 PM
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Interesting research from LRO & Chandrayaan-1: evidence that volcanism has occured as recently as 100 million years ago in Tycho crater.

http://www.universetoday.com/94583/scienti...unar-volcanism/

http://www.deccanherald.com/content/241966...c-activity.html

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Phil Stooke
post Apr 15 2012, 09:34 PM
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Most observers seem to feel that the apparent volcanism is really impact melt. But we will have to see what other studies show.

Phil



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Phil Stooke
post Sep 22 2019, 03:02 PM
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I will post this here despite the fact that it refers to Chandrayaan 1 rather than Chandrayaan 2, because the C-1 thread had not been added to since 2012.



Over on the NASASpaceflight forum, user Astro-Neel posted this:

https://forum.nasaspaceflight.com/index.php...2673#msg1992673

Astro-Neel posted some very useful video and other links, including one showing a descent video from MIP on Chandrayaan 1.

The descent frames cover the last few minutes of MIP's descent, from over Malapert crater to a final image near the south pole. Note that we don't know that the last frame shown is the last frame taken (or received). I had suggested that it might lead to an improved estimate of the MIP impact point. There are two published locations for the impact, the most authoritative being the one in ISRO's report to UNOOSA after the impact, which Astro-Neel also linked to later:

http://www.unoosa.org/documents/pdf/ser570E.pdf

(note that the comment in that report about a name for the impact site being accepted by the IAU is not correct - it remains an informal name).

I have located the last image in the video (below). It is on the rim of a small crater about 7 by 10 km across, and about 1.5 km north of the UNOOSA impact coordinates. The shape of the image outline suggests it was taken slightly obliquely from a position north of the image center, not too far north but maybe over its northern edge. (NORTH is to the left, approximately).

Attached Image


The second image (below) shows a predicted impact location. MIP may have struck the surface on the wall of that crater in ellipse 1, or it may have flown above that crater rim and hit the surface on the rim of the next crater in ellipse 2 on my image. If it passed over that crater rim it would have hit the earth-facing slope of the 'connecting ridge' between the rims of the two large craters (De Gerlache and Shackleton).

Attached Image


Let the splat-hunting begin!

Phil


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John Moore
post Sep 22 2019, 09:12 PM
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Just a 3d perspective of the area...such views sometimes give a good perspective to how the terrain roughly lies.

John

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Ohsin
post Sep 23 2019, 02:30 AM
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QUOTE (Phil Stooke @ Sep 22 2019, 08:32 PM) *
I will post this here despite the fact that it refers to Chandrayaan 1 rather than Chandrayaan 2, because the C-1 thread had not been added to since 2012.

<snip>

Let the splat-hunting begin!

Phil

That is one blast from past, amazing work. Just to point out that MIP footage is from a presentation by Alok Srivastava given at IISc that I have re-hosted, unfortunately it is in Hindi but if anyone wants translation of any relevant part just ask!
https://youtu.be/18A2araj9XE?t=2415
It was long time ago but I think there are more frames from MIP.
Let me add those links here as well.
https://imgur.com/a/i6G9fI7
QUOTE
MIP carried three instruments viz. Radar altimeter, Mass Spectrometer and Moon Imaging system (MIS) and operated during the descent to the Moon and **imaged the lunar surface in a total of 3110 frames**.


Some other references on Chandrayaan-1 imagery featuring MIS frames.
* Selected Images from Chandrayaan-1 of Moon (~388 mb) PDF / Archive (See page 117)
* Chandrayaan-1 Lunar Science Atlas (~70 mb) PDF / Archive (See page 93)
Source: https://vedas.sac.gov.in/vedas/node/63
Mirroring both for easier online viewing:
https://archive.org/details/Chandrayaan-1_Atlas

Edit: Fixed links and attached frame 3105
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Phil Stooke
post Sep 23 2019, 09:15 AM
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Thanks! Here is an image showing locations of some of the last frames:


Attached Image


When I compare this with the last image you posted showing a predicted impact point, my locations seem to run along the right edge of the image 'corridor' rather than its center. Those previous attempts to locate the last images were plotted on an Earth-based radar image (the other image base is from Clementine), and I am using LRO NAC images with at least 20 times the resolution (probably better than that), where images can be located with much better accuracy (I'm not talking about the base image in my post which is lower resolution). Note that the posted image says the circle is 1 km diameter, but it is actually 10 km (Shackleton is 20 km across).

Maybe this should all be moved to a new thread...

Phil


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Ohsin
post Sep 23 2019, 02:53 PM
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QUOTE (Phil Stooke @ Sep 23 2019, 02:45 PM) *
Thanks! Here is an image showing locations of some of the last frames:


Attached Image


When I compare this with the last image you posted showing a predicted impact point, my locations seem to run along the right edge of the image 'corridor' rather than its center. Those previous attempts to locate the last images were plotted on an Earth-based radar image (the other image base is from Clementine), and I am using LRO NAC images with at least 20 times the resolution (probably better than that), where images can be located with much better accuracy (I'm not talking about the base image in my post which is lower resolution). Note that the posted image says the circle is 1 km diameter, but it is actually 10 km (Shackleton is 20 km across).

Maybe this should all be moved to a new thread...

Phil


Another thread or an old relevant one would be nice. I have matched frame 3102 with LRO NAC reference image... getting closer but need to keep in mind 49° off nadir angle of imaging. Here's Quickmap link outlining frame 3102 and last frame from video.
Attached thumbnail(s)
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Attached Image

 
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Ohsin
post Sep 23 2019, 04:01 PM
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MIP frame 3104 matched as well.
Attached thumbnail(s)
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Attached Image
 
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Phil Stooke
post Sep 23 2019, 07:36 PM
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This is excellent. We are seeing that the impact point is further along the trajectory that the 'official' estimate in the UN document. It may be possible to find a plausible impact feature along this trajectory.

Phil


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Ohsin
post Sep 23 2019, 07:52 PM
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Indeed if 3110 frames are captured and we are already out of previous 'corridor' then impact point could easily be within ellipse 2. I had to stop as I couldn't find more well lit NAC images near relevant area and I see few requests for LRO team are already there smile.gif

http://target.lroc.asu.edu/output/lroc/lroc_page.html
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