Ninth planet

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Ninth planet

Post by tommi59 on 20th January 2016, 5:00 pm

http://www.sciencedaily.com/releases/2016/01/160120114539.htm
So far from sun it is rather doubtful to have enough volatile to become gas or ice giant it is rather large super earth with at least half planet made of water
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Re: Ninth planet

Post by Lazarus on 20th January 2016, 6:36 pm

People keep on predicting various planets out of the same datasets and they never seem to amount to much, so I'm not going to get particularly excited for this one.
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Re: Ninth planet

Post by Sirius_Alpha on 20th January 2016, 11:46 pm

Pretty low. Consensus is that the object seen in that image may be a speckle. Indeed the paper was retracted. Also, it's not really in the same direction as the predicted orbit.

And I have to agree with Lazarus here. Don't get your hopes up.

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Re: Ninth planet

Post by Edasich on 21st January 2016, 5:28 am


Hey, at that Forbes webpage they have used an exoplanet artwork of mine! Surprised

Anyway it's long time since something at Solar System's outskirts has been inferred. Let's cross fingers. Rolling Eyes
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Re: Ninth planet

Post by Mongo on 21st January 2016, 2:11 pm


Effectively zero. Alpha Centauri is in a completely different area of the sky than the predicted orbit of "Planet Nine" in this paper.
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Re: Ninth planet

Post by Stalker on 21st January 2016, 3:34 pm

Having a predicted orbit is a good point: the theory is testable and not just a "i guess there is a planet, i will anounce in the hope to illuminate my post-doc". And also Mike Brown is like the Michel Mayor of TNOs, not just a bored student.

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Re: Ninth planet

Post by PlutonianEmpire on 22nd January 2016, 1:18 pm

Yeah, he's the Pluto Killer. Razz

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Re: Ninth planet

Post by qraal on 26th January 2016, 7:17 am

Hi guys

With such an elongated orbit, it was likely ejected from amongst the Big Planets while they were forming and migrating. Thus it had plenty of opportunity to grab an atmosphere of H2/He. If it wasn't too thick a veil, there's a chance that Planet 9 could have a surface warm enough for liquid water. David Stevenson speculated on that possibility years ago.

tommi59 wrote:http://www.sciencedaily.com/releases/2016/01/160120114539.htm
So far from sun it is rather doubtful to have enough volatile to become gas or ice giant it is rather large super earth with at least half planet made of water

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Re: Ninth planet

Post by Edasich on 26th January 2016, 11:12 am

Could it be the planet inferred by Rogozin in 2012 and nicknamed "Deposs"? bounce
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Re: Ninth planet

Post by Lazarus on 22nd March 2016, 6:08 pm

Some attempts to figure out where this object would be, if it exists...

Brown & Batygin "Observational constraints on the orbit and location of Planet Nine in the outer solar system"
http://arxiv.org/abs/1603.05712

de la Fuente Marcos & de la Fuente Marcos "Finding Planet Nine: a Monte Carlo approach"
http://arxiv.org/abs/1603.06520
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Re: Ninth planet

Post by Lazarus on 24th March 2016, 7:32 pm

Investigating the possibility that the proposed Planet Nine orbit can be the result of the Solar System capturing a planet, and whether it would be possible to determine if this is the case:

Mustill, Raymond & Davies "Is there an exoplanet in the Solar System?"
http://arxiv.org/abs/1603.07247
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Re: Ninth planet

Post by Sirius_Alpha on 29th March 2016, 3:24 pm

The argument for a perturbing body seems to have gotten stronger, with another object (UO3L91) contributing to the ω-clustering.

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Re: Ninth planet

Post by Shellface on 30th March 2016, 1:35 pm

Do you have a source for that image?

Interesting to see something more eccentric and at a larger semi-major axis than Sedna.

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Re: Ninth planet

Post by Sirius_Alpha on 30th March 2016, 3:28 pm

Yeah! I'm sorry I should have included that! It's from Mike Brown's twitter.
Link to original post:
https://twitter.com/plutokiller/status/713111594197061632?lang=en

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Re: Ninth planet

Post by Lazarus on 31st March 2016, 3:34 pm

Let's start invoking more distant planets to explain more stuff! Rolling Eyes

Holman & Payne "Observational Constraints on Planet Nine: Astrometry of Pluto and Other Trans-Neptunian Objects"
http://arxiv.org/abs/1603.09008
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Re: Ninth planet

Post by Lazarus on 18th October 2016, 5:29 pm

Possible problems for the Planet Nine hypothesis?

Shankman et al. "Consequences of a Distant Massive Planet on the Large Semi-major Axis Trans-Neptunian Objects"
https://arxiv.org/abs/1610.04251
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Re: Ninth planet

Post by Lazarus on 23rd December 2016, 9:07 am

Millholland & Laughlin "Constraints on Planet Nine's Orbit and Sky Position within a Framework of Mean Motion Resonances"
https://arxiv.org/abs/1612.07774

Assuming that P9 exists, some further constraints on its orbit. Still noted that that the P9 hypothesis is still not secure. Interactive 3D model of the predicted orbit at https://smillholland.github.io/P9_Orbit/
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Re: Ninth planet

Post by Sirius_Alpha on 22nd January 2017, 10:19 am

A great summary of the current work regarding this "Planet Nine" on the Systemic blog.

http://oklo.org/2017/01/21/planet-nine-a-one-year-update/

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Re: Ninth planet

Post by exofever99 on 22nd January 2017, 3:05 pm

Lazarus wrote:Possible problems for the Planet Nine hypothesis?

Shankman et al. "Consequences of a Distant Massive Planet on the Large Semi-major Axis Trans-Neptunian Objects"
hxxps://arxiv.org/abs/1610.04251

Both Brown/Batygin and Shankman et al used the MERCURY6 software suite. The same algorithm were used with roughly the same time step and both groups simulated 4 Gyr... Shocked

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Re: Ninth planet

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