Instrument commissioning phase, Beginning final approach to the comet |
Instrument commissioning phase, Beginning final approach to the comet |
Jul 17 2014, 09:16 PM
Post
#91
|
||
Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Be careful. ESA posted an image that shows you the original resolution of the data. Most of the features that you've identified are barely more than one pixel across. I've been aware, that it's close the limit of the resolution, and first have been skeptical, too. For this I've first smoothed the image by a 1.5 pixel Gauss blur, before applying a 5 pixel hipass filter, to later enhance the image. Before identifying feature candidates I've checked, whether they occur in at least two images. The usual averaging technique to beat down noise doesn't work easy here, because the perspective changes with each image. Here the valley candidate as an example (crop of the DLR image) : (could also be an elliptical crater or two overlapping craters) Of course, there is still a risk, that some is an artifact, but it should reduce exponentially with the number of images a feature occurs. |
|
|
||
Jul 17 2014, 10:31 PM
Post
#92
|
|
Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
|
|
|
Jul 17 2014, 11:53 PM
Post
#93
|
|
Member Group: Members Posts: 204 Joined: 14-April 06 From: Seattle, WA Member No.: 745 |
I guess we will just have wait and see, won't we.
And, darn it, I cannot get that song out of my head. "Rubber duckie, your the one ...." |
|
|
Jul 18 2014, 12:04 AM
Post
#94
|
|
Member Group: Members Posts: 148 Joined: 9-August 11 From: Mason, TX Member No.: 6108 |
If you've seen Camel Rock Monument in northern New Mexico, you may be wondering if the camel has a counterpart in space: http://www.scenicusa.net/083012.html
-------------------- --
Don |
|
|
Jul 18 2014, 01:22 PM
Post
#95
|
|
Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
Call for media: Rosetta’s comet rendezvous on August 6th
http://blogs.esa.int/rosetta/2014/07/18/ca...met-rendezvous/ |
|
|
Jul 19 2014, 12:41 PM
Post
#96
|
|
Member Group: Members Posts: 105 Joined: 13-July 05 From: The Hague, NL Member No.: 434 |
|
|
|
Jul 20 2014, 08:22 PM
Post
#97
|
|
Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
|
|
|
Jul 22 2014, 12:29 PM
Post
#98
|
|
Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
I agree with the idea it look a little bit like a rubber duck.
And I have to agree, we cannot say any features are seen from just single pixels in any images. So just take a deep breath and wait a few more days for details to appear. =) |
|
|
Jul 24 2014, 01:29 PM
Post
#99
|
|
Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
New images from Rosetta!
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA -------------------- |
|
|
Jul 24 2014, 02:19 PM
Post
#100
|
|
Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
|
|
|
Jul 24 2014, 02:31 PM
Post
#101
|
|
Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
We know distance (~5500 km) so resolution is slightly over one hundred meters per pixel (102-103 m/pix).
Images on the ESA's site are 8× magnified. -------------------- |
|
|
Jul 24 2014, 03:52 PM
Post
#102
|
|
Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
If you pay attention to last frame, there is a "welding" flat region between the two portions, made of darker material compared to the bright ring all around the contact; my impression about the "white collar" is that it could be made of fresh material exposed during last passages, when volatile substances (previously filling the gap between the two portions) sublimated; obviously, this idea is highly hypothetic! Only spectral analysis, joined to high-resolution morphology, could help to confirm or not this model...
-------------------- I always think before posting! - Marco -
|
|
|
Jul 24 2014, 05:14 PM
Post
#103
|
|
Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Given the processing & enhancement done to these images & their size in pixels, is the resolution sufficient yet to determine if the albedo differences Dilo noted are real? For example, the bright 'ring' at the lobe contact point in particular sure looks like it might be specular; maybe the rest of the surface appears just as bright from the right illumination angles.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
|
|
|
Jul 24 2014, 05:22 PM
Post
#104
|
|
Solar System Cartographer Group: Members Posts: 10172 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
|
|
Jul 24 2014, 05:30 PM
Post
#105
|
|
Senior Member Group: Members Posts: 2087 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Looks like new NAVCAM's will be given out daily from now to arrival. Better than OSIRIS weekly I suppose?
|
|
|
Lo-Fi Version | Time is now: 30th May 2024 - 10:34 PM |
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. |