Author Topic: New Horizons updates  (Read 244650 times)

Online Bob Shaw

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Re: New Horizons updates
« Reply #720 on: 02/20/2019 10:48 am »

I still can't see any clue about "flatness" of UT in images and video.
The only thing which could possibly lead to think it's flat is the angle of the sun w.r.t the observer ("phase angle"), but I can't find this metadatum.

The image looks like is illuminated from behind (Phase Angle = 180°); if it was illuminated exactly from the right (Phase Angle = 90°), then it could suggest a flat shape.



The flattened shape was derived from the occulation of stars by the shadowed part, not from the illuminated surface.

Offline mcgyver

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Re: New Horizons updates
« Reply #721 on: 02/20/2019 02:10 pm »

I still can't see any clue about "flatness" of UT in images and video.
The only thing which could possibly lead to think it's flat is the angle of the sun w.r.t the observer ("phase angle"), but I can't find this metadatum.

The image looks like is illuminated from behind (Phase Angle = 180°); if it was illuminated exactly from the right (Phase Angle = 90°), then it could suggest a flat shape.



The flattened shape was derived from the occulation of stars by the shadowed part, not from the illuminated surface.
Yes I read that.... but as I said, I don't see any occultation which could justify a "almost-flat" object, even in this post on UMSF.



Anyway... who cares? :-)

Offline joseph.a.navin

Re: New Horizons updates
« Reply #722 on: 02/20/2019 07:37 pm »
I hope this is ok to post, but here is my new article on the New Horizons flyby for my HS school Newspaper, enjoy!
https://pfhstheroar.com/7081/news/cont-from-the-magazine-expanding-our-horizons-on-ultima-thule/

Offline Blackstar

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Re: New Horizons updates
« Reply #723 on: 02/22/2019 12:08 pm »
There's going to be more information released today. NH put out a video showing the rotation of UT and promised a lot more.

Offline Eric Hedman

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Re: New Horizons updates
« Reply #724 on: 02/22/2019 01:22 pm »
I hope this is ok to post, but here is my new article on the New Horizons flyby for my HS school Newspaper, enjoy!
https://pfhstheroar.com/7081/news/cont-from-the-magazine-expanding-our-horizons-on-ultima-thule/
Nice work.  I look forward to links to more articles from you.

Offline Ben the Space Brit

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Re: New Horizons updates
« Reply #725 on: 02/22/2019 01:52 pm »
Given that Ultima Thule rotates around its barycentre and around it's thinnest axis, I'm wondering if the object's rotation is almost entirely generated by the relative momentum of the two elements when they first came into contact.
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Offline hoku

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Re: New Horizons updates
« Reply #727 on: 02/22/2019 10:26 pm »
There's going to be more information released today. NH put out a video showing the rotation of UT and promised a lot more.
Closest close-up: https://www.nasa.gov/feature/new-horizons-spacecraft-returns-its-sharpest-views-of-ultima-thule

Offline FutureSpaceTourist

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Re: New Horizons updates
« Reply #728 on: 03/18/2019 12:53 pm »
https://twitter.com/jeff_foust/status/1107634584823480320

Quote
Starting off #LPSC2019 this morning with a session on the New Horizons flyby of 2014 MU69/Ultima Thule. They were handing out 3-D glasses to everyone coming into the session room, so something to look forward to…

https://twitter.com/jeff_foust/status/1107636254894706692

Quote
Alan Stern, giving an overview of the MU69 flyby: every single observation we planned for the flyby worked as planned. Downloading data through next summer. #LPSC2019

https://twitter.com/jeff_foust/status/1107637269387767809

Quote
Stern: we see a lot of depressions on the surface of MU69, but don’t think they’re all caused by impacts. Many may be internal effects. #LPSC2019

https://twitter.com/jeff_foust/status/1107637714256568321

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Stern: MU69 is the first “ultra-red” object we’ve visited. Spectra shows evidence of water ice and methanol bands. #LPSC2019

https://twitter.com/jeff_foust/status/1107638818415480832

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Former Rep. John Culberson is here, asking Stern a question about whether New Horizons’ camera will be used to search for another flyby target. (Yes, that’s the plan.) #LPSC2019

Edit to add:

https://twitter.com/jeff_foust/status/1107642410421678088

Quote
Jeff Moore: likely a very gentle merger of the two lobes of MU69 (dubbed “Ultima” and “Thule”); the two lobes are surprisingly unlike each morphologically. #LPSC2019
« Last Edit: 03/18/2019 01:03 pm by FutureSpaceTourist »

Offline theinternetftw

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Re: New Horizons updates
« Reply #729 on: 03/19/2019 06:58 am »
Also, a cool 3d printed model of the new squashed morphology:

https://twitter.com/jeff_foust/status/1107686684685205512

Offline Star One

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Re: New Horizons updates
« Reply #730 on: 03/19/2019 07:59 am »

NASA's New Horizons Reveals Geologic 'Frankenstein' That Formed Ultima Thule

Quote
"In some sense, Ultima has a fairly simplified geology, a bit like Frankenstein here," Jeff Moore, a New Horizons scientist at NASA's Ames Research Center in California, said during a presentation. "Thule has a lot more stuff here going on." In particular, this smaller lobe sports the largest feature on the object, a depression the team has nicknamed Maryland. (New Horizons is operated by the Johns Hopkins University Applied Physics Laboratory in that state.)

Offline Jaroslav

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Re: New Horizons updates
« Reply #731 on: 03/23/2019 03:48 am »
It looks more and more that it was originaly one object.

Online tyrred

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Re: New Horizons updates
« Reply #732 on: 03/29/2019 03:53 am »
It looks more and more that it was originaly one object.

How so?

From FutureSpaceTourist reply #728:
    Jeff Moore: likely a very gentle merger of the two lobes of MU69 (dubbed “Ultima” and “Thule”); the two lobes are surprisingly unlike each morphologically. #LPSC2019
    — Jeff Foust (@jeff_foust) March 18, 2019

https://twitter.com/jeff_foust/status/1107642410421678088
« Last Edit: 03/29/2019 03:54 am by tyrred »
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Offline Star One

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Re: New Horizons updates
« Reply #733 on: 03/29/2019 07:22 am »
It looks more and more that it was originaly one object.

How so?

From FutureSpaceTourist reply #728:
    Jeff Moore: likely a very gentle merger of the two lobes of MU69 (dubbed “Ultima” and “Thule”); the two lobes are surprisingly unlike each morphologically. #LPSC2019
    — Jeff Foust (@jeff_foust) March 18, 2019

https://twitter.com/jeff_foust/status/1107642410421678088

Thanks for the clarification as OP’s statement didn’t tally with my understanding of the object up to that point.

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