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PostPosted: Thu, 21-01-16, 21:43 GMT 
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Contributions, please ;-)

Fridger

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PostPosted: Fri, 22-01-16, 4:03 GMT 
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i made this image for a short tutorial idea
but it fits for a small Neptune type planet at 200+ AU
-- 4k image --
Image Image

BUT

i am not convinced that it is real , for now a maybe in the noise of the data
http://www.planetary.org/blogs/emily-la ... net-9.html

pre-print of the paper
http://iopscience.iop.org/article/10.38 ... /2/22/meta

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PostPosted: Fri, 22-01-16, 14:31 GMT 
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yeah..

While we can only be sure about planet 9th existence once a telescope finds a tiny spot of light at the right place, some existing indirect arguments are certainly encouraging.

For the more busy readers Wikipedia contains also a fair summary of the current facts.
https://en.wikipedia.org/wiki/Planet_Ni ... lanetIX-15

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PostPosted: Fri, 22-01-16, 18:25 GMT 
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Six TNOs add up to nine planets?

Hmmm. Small number statistics is a dangerous game.
It'd be an interesting discovery if confirmed though.


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PostPosted: Fri, 22-01-16, 20:24 GMT 
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ajtribick wrote:
Six TNOs add up to nine planets?

I find it remarkable though that the 6 TNO orbits do seem to lie approximately in one plane.
Quote:
Hmmm. Small number statistics is a dangerous game.

Everyone with a background in statistics will agree about misuses of statistics for small numbers. ;-) And so God knows how these 0.007% probability were calculated in case planet nine was absent. Still, my gut feeling tells me that angular momentum conservation is at work here, and this correlation is no-doubt a powerful one, quite independent of the small number issue.

Yet, there is no way to circumvent a direct discovery of planet nine, if the latter is supposed to enter astronomy textbooks in the future...

Cheers,
Fridger

PS: Perhaps someone has the interest and could find the time to implement the best-fit orbits into Celestia/ celestia.Sci. So we could play a bit and study how the orbit correlations work in practice. Could be a quite "educational" exercise.

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PostPosted: Sun, 24-01-16, 20:34 GMT 
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After a short search with the keyword "ninth planet", I came across a link to this paper. It was a link in a NY Times article. It is rather long and I just started reading. It will take me a long while to understand all of this. I'm sure there are many out there that will make more much more sense then I can. ;) It is very detailed.
EDIT: Don't I feel dumb. I just saw John posted the same link a while back. Oh well.
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PostPosted: Sun, 24-01-16, 21:57 GMT 
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^^'

it happens

right now i NEED to go to the computer store

my mouse is turning left AND right SINGLE clicks into DOUBLE and triple clicks

very annoying when moving a bunch of 4 gig isis cub files ( the 128k venus map and 64k venus dem)

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PostPosted: Sat, 30-01-16, 0:06 GMT 
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Does one suppose it will be named Tyche...or Nemesis?

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PostPosted: Wed, 09-03-16, 15:20 GMT 
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More constraints on the possible orbit in not-yet-refereed paper:

http://www.planetary.org/blogs/emily-la ... pdate.html

Coralling a distant planet with extreme resonant Kuiper belt objects
Renu Malhotra, Kathryn Volk, Xianyu Wang
http://arxiv.org/abs/1603.02196

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PostPosted: Fri, 11-03-16, 1:30 GMT 
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http://arxiv.org/pdf/1602.06116v3.pdf

1. Introduction

The discovery in 2014 of the Kuiper Belt object (KBO)
2012 VP113
(Trujillo & Sheppard 2014) in the inner Oort
cloud revived the question of a planet X. With a relatively
large radius (R ≈ 200-1000km), this object has orbital parameters
similar to those of Sedna, another large planet-like KBO

:shock: incroyable !


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PostPosted: Sun, 13-03-16, 17:06 GMT 
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But shouldn't then there be more objects (TNOs) along its older (probable) path?

I mean if they could find a couple of other TNOs with a similar behaviour and roughly in the same assumed orbit this would lend more credibility to it.

Or would the orbits of these assumed objects already have decayed to something else if "Planet 9" moved on on its orbit?

Just being a bit curious. (And by the way I still think of Pluto as no 9 :mrgreen: )


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PostPosted: Tue, 12-04-16, 3:22 GMT 
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Phil Plait over at Bad Astronomy has a funny " ? news ? " story -- from the UK's "the sun"

"No, Planet Nine Will Not Send a Wave of Earth-Destroying Comets to Kill Us All"

http://www.slate.com/blogs/bad_astronom ... s_all.html


.

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PostPosted: Sat, 23-04-16, 16:14 GMT 
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John Van Vliet wrote:
Phil Plait over at Bad Astronomy has a funny " ? news ? " story -- from the UK's "the sun"

"No, Planet Nine Will Not Send a Wave of Earth-Destroying Comets to Kill Us All"

http://www.slate.com/blogs/bad_astronom ... s_all.html


.

Ah, well, those newspapers just me me wonder if we will ever find an intelligent species on this planet :wall:

Intelligent individuals, probably (if they weren't killed for witchcraft by their peers), but an intelligent species?

Crazy hypothesis from my side: There is an intelligence quota for each species per planet. The more numerous the species, the less is available per member. :twisted: :twisted:

I really have to continue reading Carl Sagans "Demon-Haunted World", but I find it hard to read. Don't know why, it's not the language itself (my English is pretty good). I think it may be that I don't agree 100% with his positions and start arguing in my head while reading.


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PostPosted: Sat, 23-04-16, 16:20 GMT 
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every few years i reread "Demon-Haunted World"

i think i have reread it about 6 times

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