IPB

Welcome Guest ( Log In | Register )

40 Pages V  « < 19 20 21 22 23 > »   
Reply to this topicStart new topic
Mercury Flyby 1
JRehling
post Jan 16 2008, 08:05 PM
Post #301


Senior Member
****

Group: Members
Posts: 1572
Joined: 20-April 05
Member No.: 321



Mercury and the Moon have surface histories written with the same alphabet, but in different languages. At a glance, they're just alike, but then a couple of seconds into looking at a Mercury image, I start to see things that violate expectations I didn't consciously know I had.

I'm thinking of Mercury as being intermediate in thermal evolution between the Moon and Mars. Much closer to the Moon in that regard, and with no weathering, but there's just been a lot more lava flowing around Mercury since the early heavy bombardment.
Go to the top of the page
 
+Quote Post
SpaceListener
post Jan 16 2008, 08:15 PM
Post #302


Member
***

Group: Members
Posts: 253
Joined: 19-August 07
Member No.: 3299



QUOTE (Stu @ Jan 16 2008, 01:20 PM) *
[attachment=13233:EN010882...rp_small.jpg]

That is a rather very good picture. The large, shadow-filled, double ringed crater to the upper right has another peculiar thing which are the rays of minicraters sprying outside and aslo I see a strange channels which connect two small craters at the lower left corner. Maybe this channel was formed by the falling action of a big rock soon after the big meteoro made the impact to Vivaldi crater.

Looking forward to see much more pictures specially in colored images. Hope it would be by february?
Go to the top of the page
 
+Quote Post
elakdawalla
post Jan 16 2008, 08:31 PM
Post #303


Bloggette par Excellence
****

Group: Admin
Posts: 4474
Joined: 4-August 05
From: Pasadena, CA, USA, Earth
Member No.: 454



Just for fun, the same area as seen by Mariner 10. Mosaic of two images, stretched vertically 200% to make the geometry look a bit more like the MESSENGER image. Click to enlarge.


--Emily


--------------------
My blog - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
Go to the top of the page
 
+Quote Post
JRehling
post Jan 16 2008, 08:38 PM
Post #304


Senior Member
****

Group: Members
Posts: 1572
Joined: 20-April 05
Member No.: 321



[...]
Go to the top of the page
 
+Quote Post
ngunn
post Jan 16 2008, 08:44 PM
Post #305


Senior Member
****

Group: Members
Posts: 3170
Joined: 4-November 05
From: North Wales
Member No.: 542



I've just realised why this view (the Vivaldi one) is somewhat disturbing to look at. It's because some of the craters aren't circular, and this messes up the normally unconscious process of 'reading' the perspective. For instance there is a smallish crater to the left of Vivaldi with a totally shadowed interior that looks almost like a circular black hole punched through the photograph. It just won't lie down on the surface of the planet when I look at it. In fact it must be considerably elongated along the line of sight to look circular in the image, but no matter how much I tell myself this it still looks . . . disturbing. I think this is going to be a characteristic of Mercury images in general. Looking forward to some 3D - THAT should make the surface behave properly!
Go to the top of the page
 
+Quote Post
dilo
post Jan 16 2008, 09:15 PM
Post #306


Senior Member
****

Group: Members
Posts: 2492
Joined: 15-January 05
From: center Italy
Member No.: 150



Vivaldi's picture with corrected black (without the grey halo in the lower half of image), adjusted luminosity/contrast and sharpened:
Attached Image

Note the weak rim now visible inside the internal one...


--------------------
I always think before posting! - Marco -
Go to the top of the page
 
+Quote Post
tedstryk
post Jan 16 2008, 09:27 PM
Post #307


Interplanetary Dumpster Diver
****

Group: Moderator
Posts: 4243
Joined: 17-February 04
From: Powell, TN
Member No.: 33



Here is a comparison with a distant view and the new global view. There are a few features that are beyond the terminator in the Mariner-10 closeups. That large crater at the center of Caloris may well be a great drill down into Mercury.

I also attached the Mariner-10 image at a more reasonable side.

Attached Image


Attached Image


--------------------
Go to the top of the page
 
+Quote Post
jsheff
post Jan 16 2008, 09:51 PM
Post #308


Junior Member
**

Group: Members
Posts: 73
Joined: 14-June 05
From: Cambridge, MA
Member No.: 411



QUOTE (JRehling @ Jan 16 2008, 03:38 PM) *
I think a really beautiful final image product will be an albedo map of Mercury laid on top of a shaded bump map so the albedo and terrain are both apparent simultaneously (the two seem never to co-occur in any real images of Mercury). An even more compelling ingredient for such a map might turn up when we see what kind of spectral variety exists.

Quite so. When you consider the history of Mars observation, we've had centuries of Earth-based mapping of albedo features. When up-close imaging became available, it turned out there was almost no correlation between albedo features and the geological ground truth. (Thaty's not to imply the albedo maps were useless, though!) It will be interesting to see if the same will hold for Mercury ...
- John Sheff
Cambridge, MA
Go to the top of the page
 
+Quote Post
peter59
post Jan 16 2008, 09:55 PM
Post #309


Member
***

Group: Members
Posts: 529
Joined: 20-April 05
From: Poland
Member No.: 299



I'm a little dissapointed. I don't know what is wrong, but first NAC image faintly looks like newspaper print. Please don't critic me too harshly, but it's my impression. WAC image is fantastic.


--------------------
Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html
Go to the top of the page
 
+Quote Post
OWW
post Jan 16 2008, 10:33 PM
Post #310


Member
***

Group: Members
Posts: 691
Joined: 28-September 04
Member No.: 99



are you gonna tell me THIS looks like newspaper?

http://messenger.jhuapl.edu/gallery/scienc...0108826105M.png

WOW. WOW.
Go to the top of the page
 
+Quote Post
ugordan
post Jan 16 2008, 10:36 PM
Post #311


Senior Member
****

Group: Members
Posts: 3570
Joined: 1-October 05
From: Croatia
Member No.: 523



Or this???

Check out what look like streams and streams of secondary craters! ohmy.gif


--------------------
Go to the top of the page
 
+Quote Post
Guest_Sunspot_*
post Jan 16 2008, 10:41 PM
Post #312





Guests






ohmy.gif Indeed
Go to the top of the page
 
+Quote Post
Astro0
post Jan 16 2008, 11:01 PM
Post #313


Senior Member
****

Group: Admin
Posts: 2850
Joined: 21-December 05
From: Canberra, Australia
Member No.: 615



OK, a big sorry for my posts yesterday. I was up for 20 hours yesterday and 18 hours the day before on the Messenger encounter and other stuff. As I was putting a few messages on UMSF, I must have been delirious with the data rate stuff.

To clarify, it is kilobits but per second (not per hour). I was told that the inital link data rate was 25-30kilobits per second and passed that on as 'per hour' - blink.gif - my bad.

During downlink of the actual data we get a top rate of 104,166kb/s.
Our coverage was from 0020-0720 UTC, so 7 hours of actual data downlink at nearly the top rate the entire pass.
There was a 5 minute period where we were unable to get clean data due to a brief but severe storm.

I hope that makes more sense. Glad I got some sleep last night.
Looks like there might be a few more late nights though browsing through all these great images coming online.

(sleepy) Astro0
Go to the top of the page
 
+Quote Post
ugordan
post Jan 16 2008, 11:04 PM
Post #314


Senior Member
****

Group: Members
Posts: 3570
Joined: 1-October 05
From: Croatia
Member No.: 523



Here's context for that crater image (was rotated 180 deg and contrast-enhanced):



EDIT: Added both new images.

In the leftmost image in the above composite, notice how everywhere where the shadows are long, their edge is noticeably diffuse. No doubt a testament to the large angular size of the Sun there (3x as large as seen from Earth). I'm not sure you can see this in images of the Moon.


--------------------
Go to the top of the page
 
+Quote Post
Phil Stooke
post Jan 16 2008, 11:08 PM
Post #315


Senior Member
****

Group: Members
Posts: 5760
Joined: 5-April 05
From: Canada
Member No.: 227



Thanks, ugordan! I think we can see from this that the images of the interior of Caloris at this resolution are going to be spectacular, high sun or not.

Phil


--------------------
... because the Solar System ain't gonna map itself.
Go to the top of the page
 
+Quote Post

40 Pages V  « < 19 20 21 22 23 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 31st October 2014 - 11:05 PM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and 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 a project of the Planetary Society and is funded by donations from visitors and members. Help keep this forum up and running by contributing here.