Chandrayaan-II, All Chandrayaan-II related articles |
  |
Chandrayaan-II, All Chandrayaan-II related articles |
 Dec 13 2019, 01:12 PM
Post
#91
|
|
|
Member  Group: Members Posts: 103 Joined: 12-September 19 Member No.: 8664  |
There is stored energy in form of propellant and pressurant on lander which could eject debris in random direction. Could it be that anomaly occurring ~2 km above surface was severe enough to generate some debris before impact? For example lander during reconfiguration was attached with an extra solar panel that jutted out towards front.
|
 |
 
|
|
Dec 15 2019, 12:15 AM
Post
#92
|
|
|
Member Group: Members Posts: 401 Joined: 5-January 07 From: Manchester England Member No.: 1563 |
Thanks. That seems possible, but I'm not sure I understand why that's needed as an explanation - from the publicly available data I've seen the impact velocity was at least 50m/sec, the impact angle was at least 45 degrees... none of that seems inconsistent with the idea that debris could be scattered back along the ground track to me, I'm just wondering if I'm missing something wrt why it's even coming up as a topic of discussion in the wider internet.
-------------------- |
|
|
|
|
Jan 24 2020, 05:46 AM
Post
#93
|
|
|
Member Group: Members Posts: 103 Joined: 12-September 19 Member No.: 8664 |
Few official papers detailing CY-2 payloads.
Current Science, Volume 118 - Issue 1 (10 January 2020) https://www.currentscience.ac.in/php/toc.ph...18&issue=01 Solar X-ray Monitor onboard Chandrayaan-2 Orbiter https://www.currentscience.ac.in/Volumes/118/01/0045.pdf Alpha Particle X-ray Spectrometer onboard Chandrayaan-2 Rover https://www.currentscience.ac.in/Volumes/118/01/0053.pdf and Current Science, Volume 118 - Issue 2 (25 January 2020) https://www.currentscience.ac.in/php/toc.ph...18&issue=02 CHandra’s Atmospheric Composition Explorer-2 onboard Chandrayaan-2 to study the lunar neutral exosphere https://www.currentscience.ac.in/Volumes/118/02/0202.pdf Dual Frequency Radio Science experiment onboard Chandrayaan-2: a radio occultation technique to study temporal and spatial variations in the surface-bound ionosphere of the Moon https://www.currentscience.ac.in/Volumes/118/02/0210.pdf Chandrayaan-2 Large Area Soft X-ray Spectrometer https://www.currentscience.ac.in/Volumes/118/02/0219.pdf L and S-band Polarimetric Synthetic Aperture Radar on Chandrayaan-2 mission https://www.currentscience.ac.in/Volumes/118/02/0226.pdf In other news Chandayaan-3 has been approved aiming for 2021 and they finally have heart to accept reality of lander crash. https://www.newindianexpress.com/nation/202...es-2083739.html |
|
|
|
|
Feb 22 2020, 05:33 PM
Post
#94
|
|
|
Member Group: Members Posts: 103 Joined: 12-September 19 Member No.: 8664 |
More payload write-ups.
Current Science, Volume 118 - Issue 4 (25 February 2020) https://www.currentscience.ac.in/php/toc.ph...18&issue=04 Current Science, Volume 118 - Issue 3 (10 February 2020) https://www.currentscience.ac.in/php/toc.ph...18&issue=03 Terrain Mapping Camera-2 onboard Chandrayaan-2 Orbiter. (TMC-2) https://www.currentscience.ac.in/Volumes/118/04/0566.pdf Laser Induced Breakdown Spectroscope on Chandrayaan-2 Rover: a miniaturized mid-UV to visible active spectrometer for lunar surface chemistry studies. (LIBS) https://www.currentscience.ac.in/Volumes/118/04/0573.pdf Orbiter High Resolution Camera onboard Chandrayaan-2 Orbiter. (OHRC) https://www.currentscience.ac.in/Volumes/118/04/0560.pdf Imaging Infrared Spectrometer onboard Chandrayaan-2 Orbiter. (IIRS) https://www.currentscience.ac.in/Volumes/118/03/0368.pdf Instrument for Lunar Seismic Activity Studies on Chandrayaan-2 Lander. (ILSA) https://www.currentscience.ac.in/Volumes/118/03/0376.pdf Lunar near surface plasma environment from Chandrayaan-2 Lander platform: RAMBHA-LP payload https://www.currentscience.ac.in/Volumes/118/03/0383.pdf |
|
|
|
|
Jul 21 2020, 04:25 PM
Post
#95
|
|
|
Member Group: Members Posts: 103 Joined: 12-September 19 Member No.: 8664 |
QUOTE Public release of Science data from Chandrayaan-2 for global use will begin in October 2020, wherein details for accessing the data will be provided. QUOTE OHRC has acquired 22 orbits images of lunar surface consisting of nearly 1056 sq. km area. It is also used to characterize landing sites for future missions. https://www.isro.gov.in/gslv-mk-iii-m1-chan...rayaan-2-launch |
|
|
|
|
Dec 24 2020, 01:58 PM
Post
#96
|
|
|
Member Group: Members Posts: 103 Joined: 12-September 19 Member No.: 8664 |
Chandrayaan-2 six month data release for seven instruments.
https://www.isro.gov.in/update/24-dec-2020/...al-data-release QUOTE ISRO Science Data Archive (ISDA) currently holds data sets acquired by Chandrayaan-2 payloads from Sep-2019 to Feb-2020 from seven instruments. Data sets from IIRS payload will be added to this shortly. This release has Level-0 and Level-1 basic data sets prepared using Planetary Data System (PDS) version 4 standards. https://www.issdc.gov.in https://pradan.issdc.gov.in |
|
|
|
|
Dec 25 2020, 10:37 AM
Post
#97
|
|
|
Junior Member Group: Members Posts: 45 Joined: 23-July 11 Member No.: 6083 |
QUOTE (Ohsin @ Dec 24 2020, 01:58 PM)  Chandrayaan-2 six month data release for seven instruments. https://www.isro.gov.in/update/24-dec-2020/...al-data-release https://www.issdc.gov.in https://pradan.issdc.gov.in Thanks for this - instead of opening presents I've been opening Chandrayaan files  Frustratingly this first release just misses the Apollo sites - I hope they'll be coming soon!
|
|
|
|
|
Dec 25 2020, 10:34 PM
Post
#98
|
|
|
Solar System Cartographer Group: Members Posts: 10150 Joined: 5-April 05 From: Canada Member No.: 227 |
Are there images of the Vikram site? And some of us will be hoping for images of the MIP site near the south pole.
Please post anything interesting that you find. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
|
|
|
|
Dec 26 2020, 08:40 AM
Post
#99
|
|
|
Junior Member Group: Members Posts: 45 Joined: 23-July 11 Member No.: 6083 |
QUOTE (Phil Stooke @ Dec 25 2020, 10:34 PM) Are there images of the Vikram site? And some of us will be hoping for images of the MIP site near the south pole. Please post anything interesting that you find. Phil I'll try my best! To be honest the site is even worse than Chandrayaan 1's to navigate and download, and yesterday's connection was so flakey I barely got anything - there's no resume capability so a dead download is a dead download! Most of the strips listed so far seem to be taken from over 80km, which unfortunately negates the theoretically much better camera. There's one strip that looks like it ought to have Luna 21's location in it (and hopefully trails from Lunokhod 2) but nothing showed up in the ortho/DEM pair so I'm checking the larger IMG file once that downloads (attempt number 7). |
|
|
|
|
Dec 26 2020, 12:56 PM
Post
#100
|
|
|
Junior Member Group: Members Posts: 38 Joined: 7-October 20 Member No.: 8895 |
QUOTE (Phil Stooke @ Dec 26 2020, 04:04 AM) Are there images of the Vikram site? And some of us will be hoping for images of the MIP site near the south pole. Please post anything interesting that you find. Phil Total of OHRC images was only 6 but the pictures are at 0.25 m/pix Here is an example of it - https://twitter.com/Ramanean/status/1342384727471267843 And all those 6 OHRC images were near 75 degree S - https://twitter.com/Astro_Neel/status/1342647521928241152 (From Astro Neel) Gonna email those scientists about asking for more images.. |
|
|
|
|
Dec 26 2020, 06:39 PM
Post
#101
|
|
|
Solar System Cartographer Group: Members Posts: 10150 Joined: 5-April 05 From: Canada Member No.: 227 |
Hmmm... so which image was the one said to show Vikram landed intact but on its side, as reported just after the landing attempt? Not one of these.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
|
|
|
|
Dec 27 2020, 02:23 AM
Post
#102
|
|
|
Junior Member Group: Members Posts: 38 Joined: 7-October 20 Member No.: 8895 |
QUOTE (Phil Stooke @ Dec 27 2020, 12:09 AM) Hmmm... so which image was the one said to show Vikram landed intact but on its side, as reported just after the landing attempt? Not one of these. Phil There are images but it seems it has not been uploaded on the portal (I have seen the before landing image on one of the tutorials) ..Not sure whether it was a mistake or deliberately they didn't upload Their images are in 1 GB Size and with the PDS4 viewer they are going to have a hard time searching for anything in those images (ISIS3 would have been better) |
|
|
|
|
Dec 27 2020, 09:52 AM
Post
#103
|
|
|
Junior Member Group: Members Posts: 45 Joined: 23-July 11 Member No.: 6083 |
I've managed to have some success in Photoshop with the OHRC images. Choose 'Open As' and 'Photoshop RAW', then use the values in the accompanying XML file under '<Array_2D_Image>' for the height and width. 8-bit seems to be the option that works. I found the location of one of the files in the LRO quickview map and the detail was much better than the LRO image (at least in the Quickview map).
Hopefully they can throw some more out soon. |
|
|
|
|
Dec 27 2020, 10:30 AM
Post
#104
|
||
|
Junior Member Group: Members Posts: 45 Joined: 23-July 11 Member No.: 6083 |
By way of comparison, this is just a completely random section of one of the OHRC images (left), with a screenshot from the same area of the LRO quickmap (right). I haven't adjusted the OHRC image in any way. Distance across the image is about 250m.
|
|
|
|
|
|
|
Feb 8 2021, 06:37 PM
Post
#105
|
|
|
Member Group: Members Posts: 103 Joined: 12-September 19 Member No.: 8664 |
A new image from Chandrayaan-2 OHRC has been released in response to a Right To Information query (bit like FOIA requests). ISRO claims it to be Vikram's "landing site" post landing attempt.
https://old.reddit.com/r/ISRO/comments/lfdo...r_and_names_of/ |
|
|
|
|
|
Lo-Fi Version | Time is now: 24th April 2024 - 06:40 AM |
|
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
|
