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Chandrayaan 1, India's First Lunar Probe
Phil Stooke
post Oct 30 2020, 07:09 AM
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Shan! This is very interesting. I will use the numbering in the picture I showed earlier - the one with 4 MIP images, three of them labelled 3102, 3104 and 3105. Assuming those are correct, you have a new image that must follow 3105 - it might be 3106 or 3107 if the numbering from ISRO is correct. The one you post as 3103 is in fact the ISRO 3105 if you look carefully at the pattern of small craters. The one you post as 3104 is the same as the new one but with more artifacts.

The reason I say the new one is later than 3105 is that I have located it in the LRO image, exactly on the ground track of the MIP descent. It is about 2500 m south of the one ISRO calls 3105.

Are there any more images out there? The last is supposed to be 3109 or 3110.


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Shan
post Oct 30 2020, 07:43 AM
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QUOTE (Phil Stooke @ Oct 30 2020, 12:39 PM) *
Shan! This is very interesting. I will use the numbering in the picture I showed earlier - the one with 4 MIP images, three of them labelled 3102, 3104 and 3105. Assuming those are correct, you have a new image that must follow 3105 - it might be 3106 or 3107 if the numbering from ISRO is correct. The one you post as 3103 is in fact the ISRO 3105 if you look carefully at the pattern of small craters. The one you post as 3104 is the same as the new one but with more artifacts.

The reason I say the new one is later than 3105 is that I have located it in the LRO image, exactly on the ground track of the MIP descent. It is about 2500 m south of the one ISRO calls 3105.

Are there any more images out there? The last is supposed to be 3109 or 3110.


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It seems some of the images were lost in transmission so what we are looking might be the last one and not all of the 3110 images were received it seems



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Ohsin
post Nov 10 2020, 05:44 PM
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Amazing work again Phil and agreed it does appear fit to be #3106 and good to see you here Shan and thanks a lot! May I ask how did you got hold of that last frame!

Edit: Altitude of MIP for new frame (#3106 assumed) should be nearly 1.2 km. (see post 487 above)

CODE
Frame#    View angle(degree)    Altitude(km)    Foot print(km^2)    Pixel no.
2871      2.3297              21.18              10.93×8.44        720×576
2874      2.2776              20.97              10.82×8.36        720×576
3105        ~0                2.54                1.060×1.24        720×576
3106(?)    ~0                 1.15                0.89×0.613        720×576
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Shan
post Nov 11 2020, 03:03 AM
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QUOTE (Ohsin @ Nov 10 2020, 11:14 PM) *
Amazing work again Phil and agreed it does appear fit to be #3106 and good to see you here Shan and thanks a lot! May I ask how did you got hold of that last frame!

Edit: Altitude of MIP for new frame (#3106 assumed) should be nearly 1.2 km. (see post 487 above)

CODE
Frame#    View angle(degree)    Altitude(km)    Foot print(km^2)    Pixel no.
2871      2.3297              21.18              10.93×8.44        720×576
2874      2.2776              20.97              10.82×8.36        720×576
3105        ~0                2.54                1.060×1.24        720×576
3106(?)    ~0                 1.15                0.89×0.613        720×576


We have got the last frame(3109) also but it's utter dark and the impact might be somewhere around here (It seems some of the images were lost it transmission)




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Phil Stooke
post Nov 11 2020, 03:36 AM
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The last frame has just a very small part of one corner illuminated, too little for it to be correlated with the LRO base image (so far). But it's enough to show the orientation from the way craters are shaded, so we know a bit about it. Significantly, there is only one place where a shadow large enough to contain that shaded image occurs, and it's about where the image sequence suggests it ought to be, so there really is no doubt where it should lie on the map. We had the image from S. M. Ahmed of the University of Hyderabad, but I'm not sure if I am free to post it here. Something is being written now and i will post more later.

Phil


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Ohsin
post Nov 11 2020, 05:06 AM
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Thanks Phil and Shan once again great work. Love how new doors open!

https://twitter.com/smahmedhyd/status/1319268348618657794
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Shan
post Dec 6 2020, 06:07 PM
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This might the MIP's impact area.And this is just to the right of the area marked in the circle

@Phil sent you a mail on the same..The impact had dark patches might be due to the fuel in the solid rocket propellant motor or in it's spin thrusters but I am still skeptical.. (It may be very well a shadow too)
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Ohsin
post Feb 5 2021, 05:48 PM
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QUOTE
CHANDRAYAAN-1 MOON IMPACT PROBE: IMPACT LOCATION REFINED


https://www.hou.usra.edu/meetings/lpsc2021/pdf/1013.pdf

Great collaboration, finally it is out.
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Phil Stooke
post Feb 5 2021, 06:32 PM
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Thanks. I had discussed the post above with Shan privately. It is a bit off the trajectory and I don't think it is right. The best bet now will be to get a Chandrayaan 2 high resolution camera image of the area. It's too bad there was no pre-MIP image to compare it with.

Phil


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Astro_Neel
post Mar 10 2021, 09:58 PM
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Amazing work by everyone here! Just saw the LPSC poster and it looks great. Now if only Chandrayaan-2's OHRC can deliver some well illuminated terrain pics, we'll be all set.

https://lpsc2021.ipostersessions.com/?s=E7-...-B7-DF-4C-93-BC
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Shan
post Mar 11 2021, 11:09 AM
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QUOTE (Astro_Neel @ Mar 11 2021, 03:28 AM) *
Amazing work by everyone here! Just saw the LPSC poster and it looks great. Now if only Chandrayaan-2's OHRC can deliver some well illuminated terrain pics, we'll be all set.

https://lpsc2021.ipostersessions.com/?s=E7-...-B7-DF-4C-93-BC


Thanks Astrol_Neel! All credit goes to Phil for those posters! He has done a fantastic job smile.gif

We are having lot of discussions over email on the probable location of MIP and the white dot in the below pic might be very well debris of the MIP but we cant say anything about it right now (This white dot is so reflective even when the image is set a low darkness and it might not be a boulder definitely)

Not sure whether MIP's debris would have been still there even after the impact and as far as the details I know MIP was made of honeycomb structure with Aluminum plates bolted on to it sides which can very well withstand lot of impact stress (Not sure how much but definitely it might have been a factor).It was spinning at a rate of 82 RPM and impact velocity might have been around 1682 m/s.. my doubts are around this as spinning object might not have the same impact as the object that is not spinning (Magnus effect).. if MIP had a backspin with respect to the SouthPole it might have slowed due a little bit before the impact.. Moon has scant atmosphere so nothing cant be ruled out..

https://en.wikipedia.org/wiki/Magnus_effect

Only OHRC images can clarify further on this topic..there are lot of images of the particular area so combing through all those..
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