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 Post subject: Ultima Thule (2014 MU69)
PostPosted: Tue, 01-01-19, 3:53 GMT 
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a concept render based on the failsafe1 16 to 24 pixel image
Attachment:
ut1.png
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Attachment:
Ultima_Failsafe1.jpg
Ultima_Failsafe1.jpg [ 73.53 KiB | Viewed 990 times ]

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 Post subject: Re: ultma thule
PostPosted: Tue, 01-01-19, 8:58 GMT 
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Very well & Happy New Year!

Fridger

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 Post subject: Re: ultma thule
PostPosted: Tue, 01-01-19, 18:09 GMT 
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New Horizons survived its flyby of Ultima Thule

Just followed NASA Live where first download info and ONE image was given of UT.

Shape: "Bowling Pin", ~ 35 x 15 km. Tomorrow they expect more material to come in.

Attachment:
ultima_thule_01.01.2019.png
ultima_thule_01.01.2019.png [ 171.81 KiB | Viewed 342 times ]

A composite of two images taken by New Horizons' high-resolution Long-Range Reconnaissance Imager (LORRI), which provides the best indication of Ultima Thule's size and shape so far.

Artist Img:
Attachment:
UT_artist.png
UT_artist.png [ 189.09 KiB | Viewed 338 times ]


The strange shape is compatible with either a contact binary (two bodies that are touching) or a close binary system

Color etc
Quote:
The lighting environment at its surface is very dim, as it receives only about 0.05% of the light from the Sun that Earth does. We do know that Ultima Thule has a reddish color, probably caused by exposure of hydrocarbons to sunlight over billions of years. The flyby will also reveal whether it has any moons, or even a ring system.

From http://pluto.jhuapl.edu/Ultima/Ultima-Thule.php

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 Post subject: Re: ultma thule
PostPosted: Tue, 01-01-19, 18:14 GMT 
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It's going to be interesting what the shape really is like. Can't wait for more photos.

Hm, I am wondering, what is the most prominent form of these things out there in the deep?

* contact binary
* close binary system
* "more or less" spherical
* something else

--> We need more data! --> We need more spacecraft!

And Happy New Year to all.

Guckytos


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 Post subject: Re: ultma thule
PostPosted: Wed, 02-01-19, 4:53 GMT 
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looking like it is a "peanut" , that will be fun to model and apply images to it

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 Post subject: Re: ultma thule
PostPosted: Wed, 02-01-19, 18:59 GMT 
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Itokawa looks not too different..!?

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Fridger

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 Post subject: Re: ultma thule
PostPosted: Wed, 02-01-19, 20:46 GMT 
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We've gotten our first color images of 2014 MU69!

Attachment:
MU69_image_v1 copy.png
MU69_image_v1 copy.png [ 375.53 KiB | Viewed 287 times ]

(Credit: NASA/JHUAPL/SwRI)
I did notice how well-defined the two bodies of 2014 MU69 are. There are other contact binaries like 67P, but this one looks like you simply took two rocks and stuck them together...


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 Post subject: Re: ultma thule
PostPosted: Wed, 02-01-19, 21:00 GMT 
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This is cool !! Many thanks for sharing the new info here (along with credits/links !)

The color is more or less a pink type one which might not be too dissimilar from the pink of 2018 VG18. And there is a known mechanism as well (analogous to Titan colors, for example ): Hydrocarbons exposed to Sunlight after a billion years or so end up pinkish ;-)

Cheers,
Fridger

PS: This would be JohnVV's 2018 VG18 appearance with borrowed color from Ultima Thule (right)... Upon scaling the color ratios down (by a common factor) for less brightness, the result is pretty much like what John and I played with a few days ago. Click on the image for a better view...
Attachment:
Screenshot_20190102_220850.png
Screenshot_20190102_220850.png [ 482.12 KiB | Viewed 281 times ]

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 Post subject: Re: ultma thule
PostPosted: Thu, 03-01-19, 14:46 GMT 
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Here is a perhaps more realistic illumination scenario: 2018VG18 using the same color ratios as Ultima Thule above (assuming a similar reddening process of hydrocarbons on the surfaces). The 3 specular color ratios have been divided by a constant factor of 5. This is the result for 2018VG18:

Attachment:
Screenshot_20190103_153719.png
Screenshot_20190103_153719.png [ 478.22 KiB | Viewed 255 times ]


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Fridger

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PostPosted: Sat, 12-01-19, 17:03 GMT 
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a short paper on this

Quote:
Overview of initial results from the reconnaissance flyby of a Kuiper Belt planetesimal: 2014 MU69


https://arxiv.org/abs/1901.02578

the rotational period is now known as 15 +- 1 hours

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PostPosted: Sat, 12-01-19, 20:01 GMT 
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Quote:
Overview of initial results from the reconnaissance flyby of a Kuiper Belt planetesimal: 2014 MU69


Excellent, John...many thanks! That's the kind of early info that celestia.Sci likes ;-)

Cheers,
Fridger

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