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Dawn approaches Ceres, From opnav images to first orbit
Habukaz
post Apr 15 2015, 05:17 PM
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Spot 1 is considerably bigger in the sense that it is a resolved feature, while spot 5 occupies less than one pixel at that resolution.


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Explorer1
post Apr 15 2015, 07:11 PM
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Some minor news while waiting for the images: the Ceres model has been updated in the simulated view with the new info.

http://dawn.jpl.nasa.gov/mission/live_shots.asp

Looks about halfway illuminated now....
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Gladstoner
post Apr 15 2015, 09:51 PM
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Trying to make sense of the recently released color map....

The area corresponding with the long-known Piazzi feature appears here to be a 'yellowish' region possibly surrounded by a 'frosty blue' 'halo':

Attached Image


Same area in RC2 images:

Attached Image


Without markings:

Attached Image


I think this area will prove to be quite interesting once we get the hi-res images.
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elakdawalla
post Apr 15 2015, 11:02 PM
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One thing I noticed in the caption to this map (emphasis mine):
QUOTE
Images taken using blue (440 nanometers), green (550 nanometers) and infrared (920 nanometers) spectral filters were combined to create the map. The filters were assigned to color channels in reverse order, compared to natural color; in other words, the short-wavelength blue images were assigned to the red color channel and the long-wavelength infrared images are assigned to the blue color channel.


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JohnVV
post Apr 16 2015, 02:20 AM
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and that false color map is the SAME!!! data from the other images from the feb25 first close approach
THE SAME ( the gray scale part is )

nothing really new for that bright spot

now in a few days ...........
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wildespace
post Apr 17 2015, 06:51 AM
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Any idea why the order of colours has been reversed?

Here they are in the conventional order by wavelength:

Attached Image

NASA/JPL-Caltech/UCLA/MPS/DLR/IDA
Processing by M. Kakitsev


Just a guess, but I suppose that the reddish areas is old, space-weathered surface, while the blue-green areas is freshly-exposed material.


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Astro0
post Apr 19 2015, 12:29 PM
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ADMIN NOTE: A number of posts related to Dawn observations post the March 6th arrival have been moved to the 'first orbit' discussion. Please ONLY post information here if it is relevant to the 'approach' phase of Ceres.
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