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Race to discover Planet Nine using astronomy and new computational techniques

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Re: Race to discover Planet Nine using astronomy and new computational techniques

#41

Post by moomin »

sohkamyung wrote: post #34
acqq wrote: post #28

New And Better Data Disfavors A Giant World Beyond Neptune https://www.forbes.com/sites/startswithabang/2017/06/21/good... As the months passed since it was first proposed by Konstantin Batygin and Mike Brown, they compiled additional evidence for it, and things were looking rosy. But a new study by Shankman et al. has turned the evidence on its head, disfavoring the planet's existence and uncovering a bias in the da…

Yes, I've heard of that. Some follow-up articles I've read [1] [2] say that the evidence against (or for) Planet Nine is still inconclusive. But the question should be settled one way or another: Planet Nine will either be there or it won't. [1] "Solar System survey casts doubt on mysterious 'Planet Nine'" [ https://www.nature.com/news/solar-system-survey-casts-doubt-... ] [2] "Planet Nine Is Put on Trial in Absentia…

They thought that about dark matter.

Re: Race to discover Planet Nine using astronomy and new computational techniques

#42

Post by moomin »

richmarr wrote: post #39
sohkamyung wrote: post #25

Earlier quoted context omitted.

Nibiru is usually referred to as "Planet X". If it was called "Planet IX", it would be a better fit. :-)

IX would be a slightly ominous name to choose :) https://en.wikipedia.org/wiki/Ix_(Dune)

There's a remark in one of the books that the Ixians were completely unaware that their planet was named that because it was the ninth out from the Sun.

Re: Race to discover Planet Nine using astronomy and new computational techniques

#43

Post by Robotbeat »

If "Planet Nine" doesn't exist, that will be fitting Karma for those who proposed it, since they developed the new definition of planet specifically to exclude Pluto and any other planets like Pluto.

(I disagree with that definition as it made no consultation with planetary scientists who actually study planets.)

Re: Race to discover Planet Nine using astronomy and new computational techniques

#46

Post by Govindae »

sdy wrote: post #44

Maybe I missed it in the article, but why would P9 be at a 30 degree angle from all the other planets. Are they saying that what we know of how solar systems collapses to the nearly the same plane is wrong?

That effect decreases further out in the gravity well.

Re: Race to discover Planet Nine using astronomy and new computational techniques

#47

Post by scott_s »

Robotbeat wrote: post #43

If "Planet Nine" doesn't exist, that will be fitting Karma for those who proposed it, since they developed the new definition of planet specifically to exclude Pluto and any other planets like Pluto. (I disagree with that definition as it made no consultation with planetary scientists who actually study planets.)

I'm confused by your parenthetical, as the definition that excludes Pluto (and Eris) was arrived at by the International Astronomical Union (https://www.iau.org/).

Re: Race to discover Planet Nine using astronomy and new computational techniques

#48

Post by Pharylon »

sdy wrote: post #44

Maybe I missed it in the article, but why would P9 be at a 30 degree angle from all the other planets. Are they saying that what we know of how solar systems collapses to the nearly the same plane is wrong?

It would have been knocked into an eccentric orbit early in the Solar System's formation (when we had a lot more planets).

It couldn't have formed that far out. We know Uranus and Neptune are too far away - they formed closer in than they are now, and interactions with Saturn and Jupiter pushed them out. In fact, there's evidence that they switched places (Neptune originally being closer). Planet Nine could have been thrown into an eccentric orbit during this time.

Here's a relevant wikipedia article: https://en.wikipedia.org/wiki/Nice_model

Re: Race to discover Planet Nine using astronomy and new computational techniques

#50

Post by autokad »

fooker wrote: post #8

What do you define as a planet though? If you consider our sun a frame of reference, you might find that technically some far away objects bigger than the sun have complex periodical movements around the sun.

definition of a planet as follows: a planet is what ever arbitrary metrics Brown can come up with that demotes Pluto and includes the other 8 (sort of) so that he can write papers / gain fame / etc. They didn't come up with criteria and found Pluto didn't fit, they kept coming up with criteria UNTIL Pluto didn't fit and the other planets did fit.

Brown has no army over me, and I don't buy into the academic nonsense. Pluto is a planet.

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