Yet Another Astronomy Discovery: Planet 258 Tyche, A Possible Gas Giant, May Lurk in the Oort Cloud

19 Feb
The presumed distance of the Oort cloud compar...

Image via Wikipedia

2.18.2011

Copyright 2011-3011 by Photonic Portal, All Rights Reserved. Repost courtesy of CNN Online, Commentary by Photonic Portal

Will the REAL Planet X aka Nibiru Please Stand Up?

In 2011 deep space objects, asteroids, planetoids, gas giants and newly discovered  comets are converging in public awareness as the ancient [ Planet X ] Nibiru legend suddenly takes on new relevance. New space discoveries are coming at astronomers so fast it’s hard to keep up. In December 2010 the discovery of Comet Elenin fascinated astronomers, as it was Russian amateur astronomers Leonid Elenin who made the discovery. An asteroid one miles wide is plummeting toward earth as well, keeping observatories on their toes. Now NASA scientists are trying to ascertain just exactly WHAT ELSE is lurking deep within the Oort Cloud, and just exactly how big the object might be. Move over Jupiter. The possible, although doubtful, discovery of a gas giant four times the size of our largest planetary neighbor would throw all current astronomy textbooks into the dustbin, rewriting the known facts about our solar system once again.

See also:

Lloyd’s: Space Weather Could Set Society Back 100 Years


You know how you sometimes can sense that something is present even though you can’t see it? Well, astronomers are getting that feeling about a giant, hidden object in space.

And when we say giant, we mean GIANT.

Evidence is mounting that either a brown dwarf star or a gas giant planet is lurking at the outermost reaches of our solar system, far beyond Pluto. The theoretical object, dubbed Tyche, is estimated to be four times the size of Jupiter and 15,000 times farther from the sun than Earth, according to a story in the British paper The Independent.

Astrophysicists John Matese and Daniel Whitmire from the University of Louisiana at Lafayette think data from NASA’s infrared space telescope WISE will confirm Tyche’s existence and location within two years.

The presence of such a massive object in the solar system’s far-flung Oort Cloud could explain a barrage of comets from an unexpected direction, according to a December article at Space.com.

Its 27 million-year orbit could also explain a pattern of mass extinctions on Earth, scientists say.

Brown dwarfs are cold “failed” stars; their dimness and lack of heat radiation can make them hard to detect. Gas giants are huge planets – like Saturn, Jupiter and Neptune – that are made up of gases and may lack a solid surface like Earth’s.

Whitmire told The Independent that Tyche will probably be composed of hydrogen and helium and have colorful spots, bands and clouds like Jupiter.

“You’d also expect it to have moons,” he said. “All the outer planets have them.”

Tyche was first hypothesized in 1984 as Nemesis, a dark companion star to the sun. It’s been the subject of astronomical research and debate ever since. In July, another Space.com article said the celestial evidence suggests Tyche could not possibly exist.

To distinguish it from the Nemesis star theory, Matese and Whitmire are calling their object Tyche, after the good sister of the goddess Nemesis in Greek mythology.

Their research is published in Icarus, the International Journal of Solar System Studies.

================

Up telescope! Search begins for giant new planet
Tyche may be bigger than Jupiter and orbit at the outer edge of the solar system

By Paul Rodgers
Sunday, 13 February 2011

If you grew up thinking there were nine planets and were shocked when Pluto was demoted five years ago, get ready for another surprise. There may be nine after all, and Jupiter may not be the largest.

The hunt is on for a gas giant up to four times the mass of Jupiter thought to be lurking in the outer Oort Cloud, the most remote region of the solar system. The orbit of Tyche (pronounced ty-kee), would be 15,000 times farther from the Sun than the Earth’s, and 375 times farther than Pluto’s, which is why it hasn’t been seen so far.

But scientists now believe the proof of its existence has already been gathered by a Nasa space telescope, Wise, and is just waiting to be analysed.

The first tranche of data is to be released in April, and astrophysicists John Matese and Daniel Whitmire from the University of Louisiana at Lafayette think it will reveal Tyche within two years. “If it does, John and I will be doing cartwheels,” Professor Whitmire said. “And that’s not easy at our age.”

Once Tyche has been located, other telescopes could be pointed at it to confirm the discovery.

Whether it would become the new ninth planet would be decided by the International Astronomical Union (IAU). The main argument against is that Tyche probably formed around another star and was later captured by the Sun’s gravitational field. The IAU may choose to create a whole new category for Tyche, Professor Matese said.

The IAU would also have the final say about the gas giant’s name. To the Greeks, Tyche was the goddess responsible for the destiny of cities. Her name was provisionally chosen in reference to an earlier hypothesis, now largely abandoned, that the Sun might be part of a binary star system with a dim companion, tentatively called Nemesis, that was thought responsible for mass extinctions on Earth. In myth, Tyche was the good sister of Nemesis.

Tyche will almost certainly be made up mostly of hydrogen and helium and will probably have an atmosphere much like Jupiter’s, with colourful spots and bands and clouds, Professor Whitmire said. “You’d also expect it to have moons. All the outer planets have them,” he added.

What will make it stand out in the Wise data is its temperature, predicted to be around -73C, four or five times warmer than Pluto. “The heat is left over from its formation,” Professor Whitmire said. “It takes an object this size a long time to cool off.”

Most of the billions of objects in the Oort Cloud – a sphere one light year in radius stretching a quarter of the distance to Alpha Centauri, the brightest star in the southern constellation – are lumps of dirty ice at temperatures much closer to absolute zero (-273C).

A few of these are dislodged from their orbits by the galactic tide – the combined gravitational pull from the billions of stars towards the centre of the Milky Way – and start the long fall into the inner solar system.

As these long-period comets get closer to the Sun, some of the ice boils off, forming the characteristic tails that make them visible.

Professors Matese and Whitmire first proposed the existence of Tyche to explain why many of these long-period comets were coming from the wrong direction. In their latest paper, published in the February issue of Icarus, the international journal of solar system studies, they report that more than 20 per cent too many of the long-period comets observed since 1898 arrive from a band circling the sky at a higher angle than predicted by the galactic-tide theory.

No other proposal has been put forward to explain this anomaly since it was first suggested 12 years ago. But the Tyche hypothesis does have one flaw. Conventional theory holds that the gas giant should also dislodge comets from the inner Oort Cloud, but these have not been observed.

Professor Matese suggests this may be because these comets have already been tugged out of their orbits and, after several passes through the inner solar system, have faded to the point that they are much harder to detect.

So if it is real, Tyche may not only be disrupting the orbits of comets, it may also overturn an established scientific theory.

You can download a PDF showing the position of Tyche by clicking here

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5 Responses to “Yet Another Astronomy Discovery: Planet 258 Tyche, A Possible Gas Giant, May Lurk in the Oort Cloud”

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    […] Yet Another Astronomy Discovery: Planet 258 Tyche, A Possible Gas Giant, May Lurk in the Oort Cloud (alligatorfarm.wordpress.com) […]

  2. Will the REAL Nibiru Planet X Please Stand Up? | Photonic Portal 2037 - 02/28/2011

    […] Yet Another Astronomy Discovery: Planet 258 Tyche, A Possible Gas Giant, May Lurk in the Oort Cloud (alligatorfarm.wordpress.com) […]

  3. Will the REAL Nibiru Planet X Please Stand Up? | Photonic Portal 2037 - 02/28/2011

    […] Yet Another Astronomy Discovery: Planet 258 Tyche, A Possible Gas Giant, May Lurk in the Oort Cloud(alligatorfarm.wordpress.com) […]

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