‘Planet Nine’ Can’t Hide Much Longer, Scientists Say.The Evidence for ‘Planet Nine’ in Our Solar System (Gallery)
Planet Nine’s days of lurking unseen in the dark depths of the outer solar system may be numbered.
The hypothetical giant planet, which is thought to be about 10 times more massive than Earth, will be discovered within 16 months or so, astronomer Mike Brown predicted.
“I’m pretty sure, I think, that by the end of next winter — not this winter, next winter — I think that there’ll be enough people looking for it that … somebody’s actually going to track this down,” Brown said during a news conference Wednesday (Oct. 19) at a joint meeting of the American Astronomical Society’s Division for Planetary Sciences (DPS) and the European Planetary Science Congress (EPSC) in Pasadena, California. Brown said that eight to 10 groups are currently looking for the planet.
At the “next one of these [DPS-EPSC meetings], we’ll be talking about finding Planet Nine instead of just looking for it,” added Brown, who’s based at the California Institute of Technology (Caltech) in Pasadena.
That would be a pretty quick path from hypothetical planet to confirmed world. The existence of Planet Nine was seriously proposed for the first time just in 2014, by astronomers Scott Sheppard and Chadwick Trujillo, of the Carnegie Institution for Science in Washington, D.C., and the Gemini Observatory in Hawaii, respectively.
Sheppard and Trujillo noted that the dwarf planet Sedna, the newfound object 2012 VP113 and several other bodies far beyond Pluto share certain odd orbital characteristics, a coincidence that would make sense if their paths through space had been shaped by an unseen, giant “perturber” in the region.
The researchers suggested that this putative planet is perhaps two to 15 times more massive than Earth and lies hundreds of astronomical units (AU) from the sun. (One AU is the Earth-sun distance, about 93 million miles, or 150 million kilometers.)
This interpretation was bolstered in January of this year by Brown and fellow Caltech astronomer Konstantin Batygin, who found evidence of a perturber’s influence in the orbits of a handful of additional distant objects. This “Planet Nine,” as Batygin and Brown dubbed the putative world, likely contains about 10 Earth masses and orbits on a highly elliptical path whose aphelion (farthest distance from the sun) is about 1,000 AU, the researchers said. (For perspective, Pluto gets just 49.3 AU from the sun at aphelion.)
The evidence for Planet Nine’s existence has continued to grow over the past nine months, as several different research teams have determined that the orbits of other small, distant objects appear to have been sculpted as well.
One team, led by Renu Malhotra of the University of Arizona, discussed four such objects at the DPS/EPSC meeting Wednesday. And Brown’s team, led by Elizabeth Bailey of Caltech, announced at the meeting on Tuesday (Oct. 18) that Planet Nine appears to have tilted the orbits of all eight “official” planets by 6 degrees relative to the sun.
The ongoing Planet Nine research also includes efforts to pin down where the world might be in the sky these days. This is a key part of the discovery effort, since a blind search for an object so far away, and with such a huge and elliptical orbit, has little chance of success in the near term, Brown has said.
It’s likely that Planet Nine is currently at or near aphelion, located perhaps 1,000 AU from the sun, in a patch of sky measuring about 400 square degrees, Brown said. (For comparison, the full moon viewed from Earth covers about 0.5 degrees of sky.)
Astronomers have said Planet Nine is perhaps four times wider than Earth, and such an object would be easily visible with professional-grade equipment if it were relatively close to Earth, Brown explained. In addition, planets on highly elliptical orbits spend most of their time near aphelion, since they’re traveling most slowly on this part of their path, he said.
An object four times bigger than Earth that’s located at 1,000 AU would have a magnitude of about +25 on astronomers’ brightness scale, Brown added.
“This is well within reach of the giant telescopes,” he said. “The Subaru telescope, I think, on Mauna Kea, [in Hawaii] — the Japanese national telescope — is the prime instrument for doing the search. But there are a lot of other people who have clever ideas on how to find it, too, that are trying with their own telescopes.”
So which research team will ultimately find Planet Nine? Brown said he isn’t sure, and he stressed that getting credit for the historic discovery should be a secondary concern for astronomers.
“There are a lot of people looking, and we are trying as hard as we can to tell people where to look,” he said. “We want it to be found.”
The Evidence for ‘Planet Nine’ in Our Solar System (Gallery)
Scientists announced the discovery of a potential “Planet Nine” in our solar system on Jan. 20, 2016. See images of this strange giant world in our neighborhood here. THIS IMAGE: An artist’s depiction of Planet Nine as envisioned by scientists.
The Planet Nine evidence points to a giant planet with the mass of 10 Earths in the deep Kuiper Belt. Its orbit is about 20 times farther from the sun than that of Neptune.
The evidence for Planet Nine was unveiled by Caltech scientists Mike Brown (at left, a prolific Kuiper Belt object hunter) and Konstantin Batygin. The duo used mathematical models and computer simulations to map out Planet Nine’s orbit after spotting a strange alignment in the orbits of six other Kuiper Belt objects.
Here’s what we know so far about Planet Nine.
If a planet 10 times more massive than Earth is orbiting the sun beyond Neptune, it will affect the orbits of nearby objects. Researchers say five known objects fit the predicted orbits (shown here) precisely
The mythical “Planet X” is actually real, and scientists are calling it “Planet Nine.”
Astronomers have found evidence for a planet 10 times more massive than Earth in the far outer solar system, orbiting about 20 times farther from the sun than distant Neptune does.
“This would be a real ninth planet,” one of the researchers, Mike Brown of the California Institute of Technology (Caltech) in Pasadena, said in a statement. “There have only been two true planets discovered since ancient times, and this would be a third. It’s a pretty substantial chunk of our solar system that’s still out there to be found, which is pretty exciting.”
This potential “Planet Nine” has not yet been observed. But Brown and his colleague, Konstantin Batygin, also of Caltech, are inferring its likely existence based on modeling work and the weird orbits of a number of small objects in the faraway Kuiper Belt, which lies beyond Neptune.
Specifically, six Kuiper Belt objects (KBOs) cruise around the sun on elliptical paths that all point in the same direction, even though the bodies are moving at different speeds. In addition, the six KBOs’ orbits all share the same tilt — roughly 30 degrees downward, relative to the plane of the eight officially recognized planets. (Pluto, which was the ninth planet until its 2006 reclassification by the International Astronomical Union, zips around the sun in a different plane.)
The odds of this latter phenomenon occurring by chance alone are about 0.007 percent, researchers said.
“Basically, it shouldn’t happen randomly,” Brown said. “So we thought something else must be shaping these orbits.”
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