Sedna, 2012 VP113, And the Lost Orb Called Planet X

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Astronomers,  astrophysicists,  astrobiologists, geologists, and other scientists have long looked for a Super Earth as an answer to perturbations in the orbits of the outer Solar Sytem planets. They have looked for an unknown X planet, hence “Planet X.”

As a result of this search the outer Solar Sytem has been expanding its limits to farther reaches.

Sedna 2012 VP113 and the lost orb Planet X
2012 VP113, Celestia | Rediscovered Astronomy

The following recount demonstrates the search for Planet X has been active all along.

 

Early Search For Planet X

After the discovery of Uranus by William Herschel in 1781, astronomers suspected the presence of an unkown yet to be discovered planet. Scientists thought that an X planet would be the cause of perturbations to Uranus orbit. In 1821, through math calculations, Alexis Bouvard demonstrated the influence of another planetary body over Uranus.

Hue Storm Uranus, Keck II
Uranus, Keck II

Other astronomers followed up on the work of Bouvard and in 1845 Urbain Le Verrier came to the same conclusion. In the period of 1845 to 1846 both John Couch Adams and Johann Gottfried Galle observed Neptune. Neptune was then credited with the perturbations in the orbit of Uranus.

 

Sedna, 2012 VP113, And the Lost Orb Called Planet X
Neptune, Hubble Space Telescope

Later on, at the beginning of the XX century, Percival Lowell perceived perturbations in Uranus that were not explained by the presence of Neptune at that time. It was assumed a planet X was the cause of Lowell’s calculations. Then in the following years, after the work of Lowell, Clyde Tombaugh discovered Pluto in 1930.

It was assumed for decades that Pluto was the perturber of Uranus [and Neptune].

Pluto and moons, HST

 

But Pluto turned out to be too small to account for any perturbations to either Uranus or Neptune. It wasn’t until Pluto’s largest moon, Charon, was observed (1978 by James W. Christy) that Pluto’s actual size and mass were determined.

If there were any perturbations to Uranus and/or Neptune, they were not caused by Pluto.

 

Later Search for Planet X

Robert S. Harrington of the U.S. Naval Observatory, continued the search for a planet x that would explain perturbations in the orbits of Uranus and Neptune.

In a research paper entitled, The Location of Planet X, Harrington postulated that the unknown planet could be in the Scorpius or Taurus regions of the sky.

Robert S. Harrington later published a second paper in 1991 entitled, The Search for Planet X, that explained the state of his search in the southern skies.

Harrington continued with his search up to the time of his passing in 1993. Link to PDF

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19920003598.pdf

R.S. Gomes and Sylvio Ferraz-Mello also based their search for Planet X on the perturbations of Uranus and Neptune.

This particular theory for the existence of Planet X was discarded due additional calculations that attributed the perturbations proposed by Lowell, Harrington, Gomes, and others to Neptune or to simple “miscalculations”.

Sedna, 2012 VP113, And the Lost Orb Called Planet X
Trans-Neptunian Objects up to 80 AU

However, new theories were proposed in the later 1990s and at the turn of the century.

 

Planet X And the Comet Theories

Richard A. Müller postulated the existence of a stellar [sub-stellar] companion to the sun.  Müller’s  Nemesis  theory aimed at explaining periodic mass extinctions on Earth by way of  Oort cloud comets. This red dwarf would be located outside the Oort cloud.

Despite Müller’s proposal,  new geological research by Melott and Bambach (2010 and 2012) would determine that there existed a significant difference in the period of extinctions by millions of years contrasting the periodicity proposed by Müller.

Link

Update October 2015

However, a newer study by Michael R. Rampino (2014) suggest the periodicity in mass extinctions on Earth could be much shorter to around 30 million years. Rampino attributes this much shorter period to the Galactic tidal forces perturbing the Oort cloud comets when the sun passes through the galactic disc.

Link to PDF

Others attributed the periodic extinctions to statistical error or argued that no astronomical observations showed the presence of a stellar companion to the sun.

Also in the 1990s, John Matese, Daniel Whitmire, and Patrick Whitman came up with a theoretical brown dwarf, Tyche. Tyche would also explain the disruption of non-periodic comets from the Oort cloud.
However, other astronomers have recentlty looked for Tyche by analyzing IRAS and WISE surveys. Consequently, NASA’s staff has stated that a large “Saturn-like” or “Jupiter-like” object was not found in the astronomical surveys WISE or AIIWISE.

Sedna, 2012 VP113, And the Lost Orb Called Planet X
Y Class Brown Dwarf, JPL – Artist

 

Yet, new discoveries in the next century only deepened the search for an unknown Planet X.

 

The Search for Planet X In the New Century

Briefly after the turn of the century, in the new millenium, something extraordinary occurred. Michael E. Brown, C. Trujillo, and D. Rabinowits announced the discovery of Sedna in 2003. Sedna would prove to be a key player in the search for Planet X and new minor planets.

Sedna is small, roughly 1, 000 km. But Sedna’s orbit takes it much farther away than Pluto at 76 AU perihelion [closest approach to the sun] and 940 AU aphelion [farthest point from the sun]. Astronomers could not explain Sedna’s presence in that part of the Solar Sytem, something must have acted as a perturber beyond Pluto; probably an unknown massive body or Planet X.

The planetoid Sedna turned out to be of great importance because of its key role to point to a probable massive body perturbing the outer Solar Sytem.

Sedna, 2012 VP113, And the Lost Orb Called Planet X
Eris plus Sedna and 2012 VP113 orbits near closest approach to the sun- Rediscovered Astronomy

 

Michael Brown announced the discovery of yet another body in 2005, Eris.

Eris is bigger than Pluto and would prompt the entire reconsideration of what a planet is by the IAU in 2006 and a new type of planet, the dwarf planet. Eris and Pluto would ultimately both be renamed dwarf planets.

Neither Eris size or its location in the Kuiper belt explains Sedna’s orbit or its very presence towards the Oort cloud. Scientists could not explain why Sedna was there. Astronomical records started to point to a massive body as the perturber, Planet X had to be there.

Besides their Tyche theory, and before it [Tyche] was put down by some opposing astronomers, Matese and Whitmire came up with a new theory in 2006.

John Matese, Daniel Whitmire, and Jack Lissauer pointed out that a wide orbit sub-stellar planetary mass body was the perturber of Sedna to have put it into such an elongated orbit [76 AU to ~940 AU].

Their massive body would be around 800 AU away  and get closer to the sun at 76+ AU to have taken Sedna out of the Kuiper belt or scattered disk region to its current aphelion of 940 AU.

Matese and Whitmire followed the work of Gomes (2005) with resonant mechanisms and objects with orbits at 40 AU-260 AU. They also looked at the research of Morbidelli and Levison (2004) of a low mass star or brown dwarf at 800AU that could act as a perturber, a planet x.

Matese, Whitmire, and Lissauer explained that although they were looking for a sub-stellar body, their model works as well for a body the mass of Neptune and less than 2000 AU (aphelion) away.

Such an object could not have been detected by the WISE surveys.

Sedna, 2012 VP113, And the Lost Orb Called Planet X
Sedna, Eris, and 2012 VP113 Orbits  – Rediscovered Astronomy

 

Current Planet X Research

The discovery of 2012 VP113 in early 2014 by Scott Sheppard and Chad Trujillo supports and extends the current theories that propose the presence of another planet in the outer Solar System. 2012 VP113 [nicknamed Biden] lies at 80 AU perihelion and ~445 AU aphelion.

Sheppard and Trujillo think a planet, a massive Earth, may be out there and expressed WISE/AllWISE is not a suitable survey to look for a body up to 10 times the size of Earth and less masive than Saturn.

It did not take long for astronomers to propose a new theory about Planet X.

Few months after the discovery of 2012 VP113 was announced, Carlos De La Fuente and Raúl De La Fuente presented their new Planet X theory (June 2014) in a paper entitled, Extreme Trans-Neptunian Objects And the Kozai Mechanism: Signalling the Presence of Trans-Plutonian Planets.

Link to PDF here

[It is this paper that some Space News websites are citi ng as news when it was released June 2014]

In that first paper (June 2014), De La Fuente & De La Fuente, proposed the existence of a “Super Earth” at ~200 AU.  This massive Earth could explain the presence of Sedna and objects like it. They analyzed the orbits of 13 objects with the Kozai effect model.
The researchers think there may be two of these Super Earths, one at 200 AU and another at 250 AU in a ~3:2 orbital resonance with each other.

 

Sedna, 2012 VP113, And the Lost Orb Called Planet X
The Orbits of Planets and Minor Planets in our Solar System, Celestia – Rediscovered Astronomy

Their second paper of October 2014 [not January 2015] entitled, Flippping Minor Bodies: What Comet 96P/Machholz 1 Can Tell Us About the Orbital Evolution of Trans-Neptunian Objects… supports their research paper of June 2014. Link to PDF

Despite the multiple theories favoring Planet X, some astronomy websites resist to admit that Planet X research continues. It has never been absent from scholarly work.

Some of them cite the work of Michael Brown (co-discoverer of Sedna and Eris), but do not mention the work of multiple other astronomers that have proposed theory after theory favoring Planet X.
To this very day, Michael Brown refuses to say that a massive planet may exist out there. He has been forced to admit there is “something” else that had to act as a perturber. He does say that there must be more planetoids to be discovered and maybe, only maybe, one more planet about the mass of Earth.

Credit to whom credit is due, Michael Brown will go in History records for the discovery of Sedna and Eris, but he is not the proponent of these new theories and he missed the presence of 2012 VP113.

 

2012 VP113 – Biden

The search for a massive planet [from 2 – 10 Earth masses] has never stopped regardless of the poor research some Space/Astronomy news websites exhibit when making editorial decisions. They will only publish after the NASA News website or newswire services, but the work of some of the astronomers is only found through university databases and has not appeared on [NASA] News or newswire services.

Other theories might as well explain the presence of Sedna and 2012 VP113 [including Brown’s {link to PDF} – new theories do not agree with Brown’s position]. But that is not to say Planet X has not been researched by scholars or that only new age book sellers write about it.

 


By J.J. Del Mar © Rediscovered Astronomy January 2015

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