MASCOT landing on Ryugu, 3 October 2018 |
MASCOT landing on Ryugu, 3 October 2018 |
Oct 6 2018, 01:15 AM
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#61
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Member Group: Members Posts: 292 Joined: 29-December 05 From: Ottawa, ON Member No.: 624 |
I was wondering about the same thing. Either the image sensor isn't aligned to the lens due to temperature shift or related stress, or, it's deliberately like that so when the spacecraft is on the surface, and righted, both the foreground and background will be in focus like a tilt shift camera where you change the angle of the negative to increase depth of field.
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Oct 6 2018, 07:49 AM
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#62
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Member Group: Members Posts: 821 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
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Oct 6 2018, 03:27 PM
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#63
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Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
No new pictures, but some science results in this article: https://spaceflightnow.com/2018/10/05/masco...s-expectations/
QUOTE What we’ve learned so far from the pictures is it looks like the surface is more consolidated rocks overlaid by a thin layer of particulate material,” Grott said.
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Oct 11 2018, 07:01 PM
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#64
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Junior Member Group: Members Posts: 52 Joined: 16-November 06 Member No.: 1364 |
I was wondering about the same thing. Either the image sensor isn't aligned to the lens due to temperature shift or related stress, or, it's deliberately like that so when the spacecraft is on the surface, and righted, both the foreground and background will be in focus like a tilt shift camera where you change the angle of the negative to increase depth of field. It is deliberately like that. It's called the Scheimpflug principle. There's a press conference tomorrow with some new material. |
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Oct 12 2018, 12:15 PM
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#65
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Newbie Group: Members Posts: 14 Joined: 30-September 14 Member No.: 7269 |
https://www.dlr.de/dlr/presse/en/desktopdef...#/gallery/32338
Numerous boulders, many rocks, no dust: MASCOT's zigzag course across the asteroid Ryugu |
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Oct 13 2018, 03:35 PM
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#66
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Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Finally surface images! Nice oblique view of the giant south pole boulder too! The top seems to be the only big smooth part of Ryugu....
And we have a name for the landing site: 'Alice's Wonderland' |
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Oct 15 2018, 02:59 PM
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#67
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Senior Member Group: Members Posts: 1598 Joined: 14-October 05 From: Vermont Member No.: 530 |
https://www.dlr.de/dlr/presse/en/desktopdef...#/gallery/32338 Numerous boulders, many rocks, no dust: MASCOT's zigzag course across the asteroid Ryugu For those like me wondering about the "no dust" in the title, it's described only as "fine material" in the accompanying text. No dust? Makes you wonder if the dust gets cemented. |
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Oct 15 2018, 07:21 PM
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#68
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Solar System Cartographer Group: Members Posts: 10256 Joined: 5-April 05 From: Canada Member No.: 227 |
It's easy to make dust through micrometeorite impacts, and some at least should be retained. But cementing or consolidating it is much more difficult. More likely it's a sifting effect, where jostling by impacts causes large chunks to rise and small objects to fall into spaces between them. On Itokawa the same thing was seen except that in some low-lying areas the fine materal became concentrated in smooth patches. We don't see that here, maybe because Ryugu is more equidimensional.
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Jan 30 2019, 11:10 PM
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#69
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Senior Member Group: Members Posts: 1453 Joined: 26-July 08 Member No.: 4270 |
This abstract at the 50th LPSC has a new image from MASCOT, taken during local night with the red LED on. The red ellipse is labelled as the radiometer field of view. Is it possible to remove it from the image to try to restore the background image?
https://www.hou.usra.edu/meetings/lpsc2019/pdf/1267.pdf -------------------- -- Hungry4info (Sirius_Alpha)
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Jan 31 2019, 01:13 AM
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#70
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Needs a little cosmetic work around the edges of the ellipse, but here's a quick and dirty version:
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Jan 31 2019, 03:54 AM
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#71
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Forum Contributor Group: Members Posts: 1374 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
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Jan 31 2019, 03:17 PM
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#72
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Newbie Group: Members Posts: 7 Joined: 22-September 18 From: Bavaria Member No.: 8456 |
Anyone know what the scale is we are looking at ? In the article it says " MARA observed a rock formation of approximately 60 cm diameter, which is shown in Fig. 1." Fig.1. being the attached picture. But I'm not quite sure: 60cm may also refer to the red ellipse.
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Jan 31 2019, 11:54 PM
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#73
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
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Feb 1 2019, 07:21 AM
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#74
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
Anyone know what the scale is we are looking at ?
If my math is right and the pixels on the image are accurate to the original, I get the 10 cm bar (in black) based on 500 pixels at 0.2mm per pixel at the bottom of the image as mentioned in the image caption. I get the 60cm bar (in yellow) based on 300 pixels at 2mm per pixel (rough estimation, based on 0.2mm per pixel at the bottom of the image and 3mm per pixel near the horizon as mentioned in the image caption). Disclaimer: I am not an accomplished image interpreter. |
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Jul 15 2019, 09:27 PM
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#75
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Senior Member Group: Members Posts: 1453 Joined: 26-July 08 Member No.: 4270 |
"MASCOT confirms what scientists have long suspected
Small fragments of carbon-rich asteroids are too fragile to survive entry into Earth’s atmosphere" Press release: https://www.dlr.de/dlr/presse/en/desktopdef...x9fOby8qyxi5AWo Original paper: Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu https://www.nature.com/articles/s41550-019-...rPquGwVWtmiCPak -------------------- -- Hungry4info (Sirius_Alpha)
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