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PostPosted: Wed Jan 20, 2016 12:42 pm 
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Sadly, the IAU didn't reinstate Pluto...

Astronomers say a Neptune-sized planet lurks beyond Pluto
http://www.sciencemag.org/news/2016/01/ ... lar-system

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PostPosted: Thu Jan 21, 2016 11:41 am 
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Interesting that this is all based on analysis of Kuiper Belt objects with highly eccentric orbits with perihelia close to the ecliptic and physically clustered in space! Some of the new large telescopes will be used to search for this ninth planet. We may even have to wait for the James Webb Space Telescope!

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PostPosted: Fri Jan 22, 2016 12:51 pm 
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How Astronomers Could Actually See "Planet Nine"

http://www.scientificamerican.com/artic ... anet-nine/

Quote:
"Even at its most distant, and at the smallest guesses of how big it is, it's like 24th or 25th magnitude," Brown said, referring to the brightness scale astronomers use, in which higher numbers denote fainter objects. "It's not crazy; this is the kind of stuff people are finding all the time. We just need to go out and cover a good swathe of the sky."

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PostPosted: Tue Jan 26, 2016 9:16 am 
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Lorenzo Iorio has a suggestion or two on where to spot Planet Nine.

http://arxiv.org/abs/1512.05288

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PostPosted: Wed Jan 27, 2016 8:24 am 
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Mike Brown, yes that one, discusses why Planet Nine might not exist.

http://www.findplanetnine.com/2016/01/a ... think.html

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PostPosted: Thu Jan 28, 2016 10:41 pm 
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The 10th Planet: Why You got to Pluto-hate?
http://esoterx.com/2016/01/28/the-10th- ... luto-hate/

A playful bit of fun to consider regarding our potential new planet.

Quote:
Let’s start with the Sumerians. It’s a good place to start as they were the first hairless apes to start taking notes, not to mention coming up with awesome ideas like agriculture and monumental architecture. Sumerians and Babylonians were also busy collecting star catalogs as early as 1200 B.C., and may have been jotting down observations as early as 3500 B.C. While we don’t know much about their planetary theory, we do know they were positively obsessed with mathematically predicting where stuff would be and when. Life is tough enough when you’re a god-king, so it’s nice to have accurate astronomical observations in your pocket when you need them. Curiously, archaeologists unearthed Sumerian clay tablets which are presumed to depict 10 planets in the solar system, which we could write off to theological fantasy, if it weren’t for the fact that the Sumerians appeared to be effectively obsessive-compulsive when it came to astronomical calculations. Of course, the fact that nobody had invented calculus yet hampered their efforts, but they did their primitive best.

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PostPosted: Sat Feb 27, 2016 4:52 pm 
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Astronomers are closing in on the possible location of Planet 9!

http://www.aanda.org/articles/aa/pdf/fo ... 227-16.pdf

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PostPosted: Wed Mar 16, 2016 12:35 pm 
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On the hunt for a mystery planet

http://www.nature.com/news/on-the-hunt- ... et-1.19565

Quote:
He and Brown argue that an unseen Planet Nine must be shepherding them into those clusters. It would be between 5 and 10 times the mass of Earth, and travel as close as 200 AU to the Sun and as far away as 1,200 AU.

Critics say that the argument rests on just a handful of weird Kuiper belt objects. “It's very small statistics,” says David Nesvorný, a planetary scientist at the Southwest Research Institute in Boulder, Colorado, who nonetheless finds the concept intriguing. “It's as science should be — at the edge of believability.”

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PostPosted: Sat Mar 26, 2016 5:28 pm 
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There are more clues!

Scientists find more evidence that Planet Nine exists

http://www.engadget.com/2016/03/25/plan ... -evidence/

Basically there are Kuiper Belt objects (KBO) that share a particular orbit suggesting a larger object is shepherding them around.

Astronomers say they found yet another KBO with similar characteristics, and it may prove fruitful in the search for Planet 9.

IMO, Pluto will always be Planet 9 in my heart. Screw the IAU.

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PostPosted: Sun Mar 27, 2016 8:22 am 
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Only professional astronomers can join the International Astronomical Union (IAU) as individual members. Therefore, I don't think that they are going to respond to the point of view of amateur astronomers like you and me. It's better for amateurs to just ignore them.

The IAU has created quite a mess and caused a lot of confusion. An intelligent discussion of all this can be found in http://www.thefreedictionary.com/planet. It will be up to those IAU members (remember! all professionals, no amateurs) who are educators, as opposed to researchers, to knock some sense into the organization. It's these educators who suffer from the confusion. The professional researchers who belong to the IAU couldn't care less. They may even enjoy being the villains, liked the man who shamelessly brags about "killing Pluto".

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PostPosted: Wed Mar 30, 2016 10:16 am 
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Planet 9 May Hail From Sun's Stellar Birth Cluster

http://www.forbes.com/sites/brucedormin ... h-cluster/

Quote:
Mustill says that depending on how long the Sun stayed in proximity with its stellar siblings, indeed, Planet 9 may have been captured within the first 100 million years of our star’s formation. As Mustill notes, evidence suggests that the Sun was born into a large open cluster of at least a thousand stars.

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PostPosted: Mon Apr 04, 2016 1:28 pm 
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Was Planet 9 a Five-Finger Discount?

https://www.newscientist.com/article/20 ... y-the-sun/

Quote:
But one team now suggests just the opposite: (Planet 9) was captured from a nearby star.

The idea isn’t all that far-fetched. The sun was born in a reasonably large stellar cluster with roughly 1000 or maybe even 10,000 stars, says Alexandar Mustill from the Lund Observatory in Sweden. In such a dense cluster, the sun would have had quite a few close encounters with other stars, potentially letting them swap planets from time to time.

"It would be pretty wild – to pick up an alien planet and bring it along for the ride," says Greg Laughlin at the Lick Observatory in California

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PostPosted: Fri Apr 08, 2016 9:22 am 
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Lemme tell ya, it's not sugar nor spice. Not even snips, snails, and puppy-dog tails.

Astrophysicists guess at the potential composition of the alleged Planet 9.

http://www.sciencealert.com/astrophysic ... be-made-of

Quote:
http://i.imgur.com/IK4FNw1.jpg

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PostPosted: Sun Apr 10, 2016 1:03 pm 
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Ut oh... Planet 9 not affecting Cassini at Saturn

http://earthsky.org/space/planet-9-not- ... -at-saturn

Quote:
While the proposed planet’s existence may eventually be confirmed by other means, mission navigators have observed no unexplained deviations in the spacecraft’s orbit since its arrival there in 2004.


More from NASA: http://www.jpl.nasa.gov/news/news.php?release=2016-101

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PostPosted: Sat Apr 30, 2016 8:34 am 
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Well, it's about time!

Physicists think they've finally figured out how to locate Planet Nine

http://www.sciencealert.com/physicists- ... lanet-nine

Quote:
Black-body radiation gives us a way to see Planet Nine, which probably emits light that’s right on the border between the infrared and microwaves. Conveniently, we have telescopes that search the sky for light on the border of the infrared and microwaves.

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PostPosted: Thu May 05, 2016 11:56 am 
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Planet Nine Skeptics Explain Their Skepticism

http://mysteriousuniverse.org/2016/05/p ... skeptical/

Quote:
The evidence points to Planet Nine existing, but we can’t explain for certain how it was produced.

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PostPosted: Wed May 11, 2016 12:38 pm 
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Not "Planet Nine", but it's pretty big for an unnamed object.

http://www.jpl.nasa.gov/news/news.php?feature=6509

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PostPosted: Wed Jun 01, 2016 7:06 am 
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Physicists think they know what Planet Nine is: An exoplanet stolen from another star

http://www.sciencealert.com/physicists- ... other-star

Quote:
"Those are pretty good odds, but they dropped when the team took into account whether the passing planetary system would have a wide-orbit planet in the first place. Also, it wasn’t enough to just capture a planet - their simulations only worked if they captured one that was exactly like Planet Nine. Overall, Mustill and his colleagues think the chance that Planet Nine is an exoplanet ranges from 0.1 to 2 percent."


We haven't found it, we haven't sighted it, IMO these are astronomers circlejerking over their cleverness for publicity rather than doing science for the sake of science.

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PostPosted: Tue Jun 14, 2016 9:41 am 
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Astronomers say there could be at least 2 more mystery planets in our Solar System

http://www.sciencealert.com/astronomers ... lar-system

IMO, stop theorizing and start producing hard evidence.

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PostPosted: Wed Jun 29, 2016 3:17 pm 
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An Update on Planet Nine

http://aasnova.org/2016/06/24/an-update-on-planet-nine/

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PostPosted: Wed Jul 13, 2016 9:14 pm 
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Astronomers Discover New Likely Dwarf Planet

http://www.nytimes.com/2016/07/14/scien ... lanet.html

Quote:
The new object, designated 2015 RR245, was first spotted in February as the astronomers looked through images taken five months earlier. Further observations a few weeks ago confirmed the object’s 700-year loping path around the sun.


Also relevant:

Quote:
Even if the newly found world is a dwarf planet, however, it will probably be years before it might earn official designation — part of the confusion of definitions that followed the International Astronomical Union’s decision in 2006 to demote Pluto and reduce the solar system to eight planets from nine.


Emphasis mine.

If you used up your 10 monthly views of the New York Times, open the link in a private browsing window.

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PostPosted: Thu Aug 11, 2016 9:53 am 
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This link is related to the putative Planet 9 because it involves one of the researchers, Konstantin Batygin from the California Institute of Technology.

Mystery object in weird orbit beyond Neptune cannot be explained

https://www.newscientist.com/article/21 ... -explained

Quote:
The (Trans-Neptunian Object) orbits in a plane that’s tilted 110 degrees to the plane of the solar system. What’s more, it swings around the sun backwards unlike most of the other objects in the solar system. With this in mind, the team that discovered the TNO nicknamed it “Niku” after the Chinese adjective for rebellious.

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PostPosted: Thu Aug 11, 2016 1:44 pm 
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It's sort of redundant to say "tilted 110 degrees to the plane of the solar system. What’s more, it swings around the sun backwards unlike most of the other objects in the solar system." Instead of "What's more," they probably should have said "That means." Solar system objects with an inclination of 0 to 90 degrees are in direct motion (or in the modern back-formation, prograde motion). A 90-degree inclination means the orbit is perpendicular to the plane of the solar system. 90 to 180 degrees would be retrograde (i.e., "backwards").

The New Scientist article notes that it's 160,000 time fainter than Neptune (which has little meaning to me). I'm not sure where they got this information. I looked at the paper in ARXIV and could only find a reference to the approximate 22.5 limiting magnitude of Pan-STARRS 1. Regardless, 160,000 times is equivalent to 13 magnitudes (= the log of 160,000 divided by the log of the fifth root of 100). Since Neptune is nominally 8th magnitude, this object would be around 21st magnitude.

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PostPosted: Tue Aug 30, 2016 6:50 am 
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New Solar System objects just made the case for Planet Nine even stronger

http://www.sciencealert.com/astronomers ... n-stronger

Not a very good article as the author states astronomers have found many small objects in the outer solar system and somehow they bolster the foundation for the hypothesis of a large planet. Doesn't say why, like they share the same orbit or barycenter.

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PostPosted: Tue Aug 30, 2016 6:52 pm 
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Planet Nine May Doom Planets One Through Eight

http://mysteriousuniverse.org/2016/08/p ... ugh-eight/

Quote:
The existence of a distant massive planet could fundamentally change the fate of the solar system. Uranus and Neptune in particular may no longer be safe from the death throes of the Sun. The fate of the solar system would depend on the mass and orbital properties of Planet Nine, if it exists.


The full text should anyone be interested:

http://mnras.oxfordjournals.org/content ... as.stw2170

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