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Radar And Mariner 10, Best possible mapping, pre-Messenger
Phil Stooke
post Jan 28 2008, 01:53 PM
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The omission of low resolution regions from the USGS maps probably stems from the procedure used. I think the maps were made using pre-assembled mosaics of the best images - and certainly from hard-copy. The extra work entailed in special processing of low resolution frames for the cartographers was probably not considered worh the effort, given that only a narrow slice of the terrain would be added, and that few unambiguous features would be seen. Mozart is an exception, obviously. This is very different from the Voyager situation where 50% or even 75% of a moon might only be seen at low resolution.

Sadly, the days of airbrush relief are pretty much over, but the laser altimeter will presumably give MOLA-like results to enable relief mapping.

Phil


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4th rock from th...
post Jan 28 2008, 02:34 PM
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QUOTE (tedstryk @ Jan 27 2008, 10:45 PM) *
Here is a combined version with both inbound and outbound coverage.


That's nice! I really like the planet's apparent rotation. Here's an inbound animated Gif :-)

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tedstryk
post Jan 28 2008, 03:31 PM
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Great job 4th rock. I will say this. A lot of the apparent rotation is spacecraft motion. If you notice, the features appear to rotate, but to a large extent, the terminator moves with them. I am also noticing that I murdered the terminators of the distant approach crescents during my 16-bit to 8-bit conversion. This makes the terminator seem more static than it is. When I get home from work, I will load a new version.


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tedstryk
post Jan 28 2008, 03:46 PM
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One thing of interest is the relatively large crater with prominent eject is clearly visible on the terminator in the distant Mariner views. This is a good indication that it is deep. Multispectral imaging here might give us really good drill into the central Caloris basin.

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Phil Stooke
post Jan 28 2008, 04:21 PM
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Quite right, Ted - and in fact it shows up as a very dark ejecta crater in the new mosaic. And the bright spot underneath it in your image is resolved as a small bright ray crater - so it didn't penetrate the dark underlying material. Some good stratigraphy should be worked out there.

Phil


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JRehling
post Jan 28 2008, 06:39 PM
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elakdawalla
post Jan 28 2008, 06:58 PM
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QUOTE (JRehling @ Jan 28 2008, 10:39 AM) *
The gray values in the jpg should do a pretty good job of indicating the objective albedo of a given point.
...provided that incidence and emission angles are pretty much constant across the image. Problem is that most of the images we've been looking at are pretty wide views, with a lot of variety in sun angle across an image. To really figure out what's going on from place to place albedo-wise we're going to have to wait for maps formed from images taken at relatively constant local solar time, and for that we're going to have to wait at least one Mercury year (though the precession of MESSENGER's orbit interacts in ways I don't yet understand with the slow rotation to make that a bit of a challenge, I think).

--Emily


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elakdawalla
post Jan 28 2008, 09:21 PM
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QUOTE (tedstryk @ Jan 27 2008, 05:11 PM) *
Also, here is a neat little Mariner 10 shot of Jupiter (moons are greatly brightened).
[attachment=13357:mariner10jupiter.jpg]

Neato! Do you happen to have the date and time of that image?

--Emily


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tedstryk
post Jan 28 2008, 10:59 PM
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September 19, 1974, centered around 21:20 GMT.


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machi
post Nov 8 2009, 09:35 PM
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This can be usefull for someone. Quick mosaic of Mercury with locations of images from folder 30 (from PDS Mariner 10 CDs). Images 169 - 230. These are from first flyby, before closest approach.
Numbers are mainly in right lower corner of rectangles. Resolution of mosaic is 2.71 km/pix.
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machi
post Nov 9 2009, 04:18 PM
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Another one for high resolution images. Images from folders 31 and 33.
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scalbers
post Oct 8 2011, 05:24 PM
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QUOTE (PhilHorzempa @ May 23 2006, 03:00 AM) *
Thank you for this link. There is one mosaic, from the link above,
from Mariner 10's second encounter with Mercury,
that is close to what was in Sky and Telecope, namely this one.

Another Phil


Attached Image


http://ser.sese.asu.edu/M10/TXT/2nd.gif

It might be interesting to see if a higher resolution version of this south polar mosaic is available.


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