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Forum » SpaceEngine » Science and Astronomy Discussions » First Hi-Res Photos of Ceres Are Here!
First Hi-Res Photos of Ceres Are Here!
WatsisnameDate: Tuesday, 03.03.2015, 00:15 | Message # 16
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We have to remember that the average albedo of Ceres is very low -- only 0.09, so what appears like a very bright or reflective surface is probably more exaggerated than in reality.




 
pzampellaDate: Friday, 06.03.2015, 16:39 | Message # 17
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So Dawn is now orbiting Ceres, How much time until the bright spot mystery is definitely solve?


Attachments: 9260606.png(23Kb)


Edited by pzampella - Friday, 06.03.2015, 16:42
 
VoekoevakaDate: Saturday, 14.03.2015, 00:17 | Message # 18
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I found this mosaic on wikipedia.



One step before habing a global map.





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RockoRocksDate: Saturday, 14.03.2015, 08:48 | Message # 19
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Voekoevaka, is that the largest resolution available?




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JohnVVDate: Wednesday, 25.03.2015, 00:06 | Message # 20
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For those interested
i posted a 8bit ( high-pass'ed ) dem and a 32 bit floating point ( meters RADII ) dem

--Original data is from :
-- the 512 vertex plate model
ftp://naif.jpl.nasa.gov/pub/naif/DAWN/misc/ceres/

two screenshots from the 512 mesh


hipass of the baked dem ( 0 to 360 mapping)


the 32 bit ISIS3 cub file ( DEMPREPED)

https://drive.google.com/file....sharing
in 0 to 360 long at 8ppd

this looks to be the default for images from the dawn team



some relevant links
CelestiaMatters
http://forum.celestialmatters.org/viewtopic.php?f=4&t=741
UMSF
http://www.unmannedspaceflight.com/index.php?showtopic=7960
http://www.unmannedspaceflight.com/index.php?showtopic=7789


Edited by JohnVV - Wednesday, 25.03.2015, 00:08
 
SpaceEngineerDate: Wednesday, 25.03.2015, 00:18 | Message # 21
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It looks like this DEM is relative to the sphere. It is better to make it relative to the ellipsoid, and add right Oblateness parameter for Ceres into SE and Celestia. With this the DEM map will have better accuracy.

EDIT: Forgot the screenshot. Texture on polar regions is patched with uniform gray.
BTW brightness of the all texture should bу reduced to make the bright white spot really bright.


Attachments: 9867549.jpg(111Kb)





 
werdnaforeverDate: Wednesday, 25.03.2015, 02:18 | Message # 22
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Either it's some metal, or...


Edited by werdnaforever - Wednesday, 25.03.2015, 02:18
 
FastFourierTransformDate: Wednesday, 25.03.2015, 09:27 | Message # 23
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Quote
Either it's some metal, or...


It's interesting because we are orbiting Ceres from two weeks and we haven't seen any new images of the surface since the rendevous
 
HarbingerDawnDate: Wednesday, 25.03.2015, 09:45 | Message # 24
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Quote FastFourierTransform ()
It's interesting because we are orbiting Ceres from two weeks and we haven't seen any new images of the surface since the rendevous

Because Dawn is on the night side of the planet, it will be a while before it can take good images again.





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HandbananaDate: Wednesday, 25.03.2015, 23:01 | Message # 25
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Quote FastFourierTransform ()
It's interesting because we are orbiting Ceres from two weeks and we haven't seen any new images of the surface since the rendevous

Quote HarbingerDawn ()
Because Dawn is on the night side of the planet, it will be a while before it can take good images again.


This article explains why we haven't seen better photos yet:

http://www.popsci.com/why-no-close-ups-ceres





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FastFourierTransformDate: Monday, 30.03.2015, 18:08 | Message # 26
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Quote HarbingerDawn ()
Because Dawn is on the night side of the planet, it will be a while before it can take good images again.


Wow, such a huge orbital period!! We have to wait a week more wacko
 
JohnVVDate: Thursday, 09.04.2015, 00:40 | Message # 27
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not really a huge orbital period
just a VERY LOW DeltaV insertion

i have not tried using SE to display the JPL NAIF orbital kernel files
the close approach was on Feb 25

30 days later March 25


today April 9

then on April 25


the space craft will be in a HIGH eccentricity orbit that is slowly circularizing

Added (09.04.2015, 00:40)
---------------------------------------------
but Dawn is approaching the light side
2 day intervals starting April 12


now i just have to figure out how to use the NAIF orbital kernels is SE
the accuracy above is about +- 500 Meters of when and where the two bodies are

 
midtskogenDate: Tuesday, 21.04.2015, 13:22 | Message # 28
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Bright spots coming into view again:





NIL DIFFICILE VOLENTI
 
FastFourierTransformDate: Monday, 08.06.2015, 16:29 | Message # 29
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With the new images, the brigh region of the big spot is getting clearer so I have redone my aprox calculations.
Been the crater 92 km in diameter and taking, some not very accurate measurements of the last image released by Dawn, on Geogebra



I can tell that the shining region is at max 9,3 km wide!!

As I said here the apparent size of the bright spot would shrink with every more accurate image of the crater. The last rough calculation showed a bright spot of 14,5 Km.

How big that thing acctually is? blink

Added (23.04.2015, 22:20)
---------------------------------------------
I've immagined the bright spot like this, at near distances. The image is a salt deposit in the bottom of a martian crater smile

Added (08.06.2015, 16:29)
---------------------------------------------
First Mapping of the Dwarf world compelted!



Edited by FastFourierTransform - Wednesday, 22.04.2015, 11:22
 
WwadlolDate: Saturday, 13.06.2015, 22:39 | Message # 30
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Close up of the bright spot.

http://news.discovery.com/space....610.htm
 
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