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Dawn approaches Ceres, From opnav images to first orbit
Phil Stooke
post Jan 12 2015, 12:10 AM
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On Tuesday (two days from now, for visitors from the future), the first optical navigation image will be taken... hopefully we'll have it in our hands soon after that. So it's time for a new topic. Over the next few months we'll have progressively closer images and full orbit characterization sequences, no doubt including multispectral image sets.

A new world...

This is a bit of reprocessing I have been doing with the Hubble images from a few years ago.

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Phil


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MizarKey
post Jan 12 2015, 02:48 AM
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I very excited to see this little world better. Nice processing on those Hubble images though!


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vikingmars
post Jan 12 2015, 08:22 AM
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QUOTE (Phil Stooke @ Jan 12 2015, 01:10 AM) *
A new world...
This is a bit of reprocessing I have been doing with the Hubble images from a few years ago.
Phil

WOW, Phil : you are still the best !
Thanks to this VERY NICE processing of yours, I just realize how bright some craters are (very bright indeed)... and why the astronomers community is just drooling over the underlying layer of ice (and a possible ocean) on this small world.
Thanks so much again ! wheel.gif wheel.gif wheel.gif
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tedstryk
post Jan 12 2015, 12:35 PM
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Beautiful! I've fooled with this dataset a little and not gotten anything worth showing out of it.


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Phil Stooke
post Jan 12 2015, 05:59 PM
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This is a cylindrical map made from those images. Longitudes start at 0 at the left edge, following the mapping by Li et al. in Icarus in 2006. My registration is not very good, and the dark southern polar region must be an artifact, but it's something to play with as we start to get the early images.

Phil

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DrShank
post Jan 13 2015, 12:46 PM
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Very Nice!
can i post it on my blog later today?


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4th rock from th...
post Jan 13 2015, 12:57 PM
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Great map!
Besides the lighter patches I see one or two interesting dark ones.


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Phil Stooke
post Jan 13 2015, 02:01 PM
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Hi Paul - by all means post it. It's not as nice as you suggest but it's a start! I look forward to its very rapid replacement with something better.

Phil



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DrShank
post Jan 13 2015, 04:37 PM
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I am most intrigued by the apparent 'bluing' near the poles. will be interested to see if that is real.


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Phil Stooke
post Jan 13 2015, 04:46 PM
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In the single images, it's bluer near the limb and terminator, and the composite leaves that blue near the poles but loses it where images overlap near the equator. I expect it's an artifact or a photometric effect, but there is a possibility of higher albedo (looking blue) near the poles as we see at Ganymede.

Phil



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DrShank
post Jan 13 2015, 06:02 PM
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true. but some of the images seem to show stronger 'blue' near the poles. wont know till we get there!


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PDP8E
post Jan 13 2015, 07:15 PM
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Dawn is supposed to take another Ceres image today -- release will most likely be .....? (soonish)


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DrShank
post Jan 14 2015, 12:12 AM
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can't comment on pronunciation as my latin is rusty, but i do have a blog about the approach posted . . .

http://stereomoons.blogspot.com/2015/01/ye...-pluto-get.html
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Mithridates
post Jan 14 2015, 03:40 AM
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It's now the evening of the 13th. Is it safe to say that the Dawn team is looking at the 25 pixel image of Ceres as we speak?
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Decepticon
post Jan 14 2015, 04:26 AM
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The image that was taken Dec 1,2014 took 7 or 8 days to release.


We just have to wait.
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