NASA missions may re-elevate Pluto and Ceres from dwarf planets to full-on planet status

February 26, 2015 by David A Weintraub, The Conversation
Two views of Ceres acquired by NASA’s Dawn spacecraft ten hours apart on Feb. 12, 2015, from a distance of about 52,000 miles as the dwarf planet rotated. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Ceres is the largest object in the asteroid belt, and NASA's Dawn spacecraft will arrive at this dwarf planet on March 6, 2015.

Pluto is the largest object in the Kuiper belt, and NASA's New Horizons spacecraft will arrive at this dwarf planet on July 15, 2015.

These two events will make 2015 an exciting year for exploration and discovery. But there is much more to this story than mere science. I expect 2015 will be the year when general consensus, built upon our new knowledge of these two objects, will return Pluto and add Ceres to our family of solar system planets.

The efforts of a very small clique of Pluto-haters within the International Astronomical Union (IAU) plutoed Pluto in 2006. Of the approximately 10,000 internationally registered members of the IAU in 2006, only 237 voted in favor of the resolution redefining Pluto as a "dwarf planet" while 157 voted against; the other 9,500 members were not present at the closing session of the IAU General Assembly in Prague at which the vote to demote Pluto was taken. Yet Pluto's official planetary status was snatched away.

Ceres and Pluto are both spheroidal objects, like Mercury, Earth, Jupiter and Saturn. That's part of the agreed upon definition of a planet. They both orbit a star, the Sun, like Venus, Mars, Uranus and Neptune. That's also part of the widely accepted definition of a planet.

Unlike the larger planets, however, Ceres, like Pluto, according to the IAU definition, "has not cleared the neighborhood around its orbit." The is, apparently, Ceres' neighborhood while the Kuiper Belt is Pluto's neighborhood – though no definition of a planet's neighborhood exists, and no agreed upon understanding of what "clearing the neighborhood" yet exists. Furthermore, no broad-based agreement exists as to why "clearing the neighborhood" need be a requirement in order for an object to be considered a planet.

Some planetary astronomers would argue that were the Earth placed in the Kuiper Belt, it would not be able to clear its neighborhood and thus would not be considered, by the IAU definition, a planet; apparently location matters. Here a planet, there not a planet. I'd argue that location shouldn't matter; instead, the intrinsic properties of the objects themselves should matter more. And so we are led back to Ceres and Pluto.

Never before visited by human spacecraft, Ceres and Pluto, as we will soon bear witness, are both evolving, changing worlds. Yesterday, Ceres and Pluto were strangers, distant, barely known runt members of our solar system. By the end of this calendar year, however, we will have showered both objects with our passion and our attention, we will have welcomed them both into our embrace. And we almost certainly will once again call both of them planets.

Ceres, temporarily a planet

Ceres was discovered on New Year's Day in 1801, by Italian astronomer Giuseppe Piazzi, a member of an international team of astronomers dubbed the Celestial Police, who were searching for a supposedly missing planet in between the orbits of Mars and Jupiter. When discovered, Ceres was immediately recognized as a planet, the eighth one known at the time (neither Neptune nor Pluto had been discovered yet).

Launch of NASA’s Dawn spacecraft from Cape Canaveral Air Force Station, Florida, September 27, 2007. Get ready, Ceres! Credit: NASA

But within a few years, other objects in the asteroid belt were discovered and Ceres no longer seemed to stand out as far from the crowd. In 1802, the great astronomer William Herschel suggested that Ceres and Pallas and any other smaller solar system objects should be called asteroids – meaning star-like. In telescope images, they were so tiny that they looked point-like, like stars, rather than disk-like, like planets. And so, more than a century before Pluto was discovered, Ceres was plutoed.

But Ceres does still stand out. It's the largest asteroid, by far, nearly 1,000 kilometers across (twice as large in diameter as Vesta, the second largest asteroid), though not perfectly spherical in shape.

As happened inside Earth and other planets, planetary scientists think that long ago, the denser material in Ceres separated from the lighter material and sank to form a core.

Astronomers think Ceres is rich in water – as much as one-third of Ceres might be water – and may have a thin atmosphere. Bright, white spots on its surface might even be large frozen lakes. Ceres may, in fact, have as much fresh water as Earth, have Earth-like polar caps, and might even have a sub-surface liquid ocean layer, like Jupiter's moon Europa and Saturn's moon Enceladus.

Beginning this month, we'll start to learn more about these tantalizing possibilities. With our increasing knowledge of and familiarity with Ceres, we will no longer be able to identify meaningful criteria that will allow us to continue to classify Ceres as not-a-planet. Ceres will continue to be a small planet, but in 2015 we will come to understand that dwarf planets are planets, too.

Pluto's short planetary reign

When Pluto was discovered by Clyde Tombaugh in 1930, many astronomers were certain that a large planet orbited the Sun beyond Neptune. Instead they found Pluto, which turned out to be small compared to Earth and Neptune, though more than double the size of Ceres, with a diameter of 2,300 kilometers.

Pluto also has an unusual orbit, as it crosses Neptune's orbit, though it does so in such a way that it can never collide with Neptune.

An artist’s impression of the Dawn spacecraft traveling in the asteroid belt with its target Ceres on the right. Credit: JPL

Pluto's modern-day troubles began in 1992, when astronomers David Jewitt and Jane Luu discovered the first objects in the region of the solar system now known as the Kuiper Belt. Whereas the asteroid belt where Ceres resides is made mostly of house- and mountain-sized rocks that orbit the Sun in between the orbits of Mars and Jupiter, the Kuiper Belt is made mostly of house- and mountain-sized chunks of ice that orbit the Sun beyond the orbit of Neptune. Pluto, as it turns out, is one of the biggest objects in the Kuiper Belt.

So what is Pluto?

Pluto is the last unexplored planet in our solar system. And the Kuiper Belt may contain hundreds of other planetary worlds like Pluto. These may be the most numerous worlds in the solar system; they may contain, together, the most total surface area of all the solid-surfaced planets.

Pluto has one large moon, Charon, and at least four small moons: Nix, Hydra, Kerberos and Styx. It has an atmosphere that expands and contracts as Pluto warms and cools during its 248 year orbit around the Sun. The surface is likely rich in water ice, enriched with methane and nitrogen and carbon monoxide frosts; these ices might contain complex organic molecules.

Water geysers erupting from south polar region of Saturn’s moon Enceladus. Credit: NASA/JPL/Space Science Institute

The New Horizons mission is poised to answer some of our myriad questions about Pluto. How did it form? What is the atmosphere made of? What is the surface like? Does Pluto have a magnetic field? What are the moons like? Does Pluto have a subsurface ocean? Is the surface of Pluto's moon Charon pure water ice?

Pluto has guarded its secrets for four and half billion years. But in a few months, a few intrepid humans will pull back the curtain on Pluto and say "Hello, Pluto, we're here." And Pluto will begin to share her secrets with us. When she does, as with Ceres, our familiarity with Pluto will help us recognize that Pluto is, was, and has always been a planet, albeit a small one.

We only get to visit Ceres and Pluto for the very first time, once. This year. March 6 and July 15. In your lifetime. In this incredible year of the . Get ready to party. Ceres and Pluto are coming home.

Animation of rotating Ceres, made from a series of images taken by NASA’s Dawn spacecraft on February 4, 2015, at a distance of about 90,000 miles from the planet. Credit: NASA
Pluto and its five moons – as seen from the Hubble Space Telescope in July, 2012. Credit: NASA, ESA, and M. Showalter (SETI Institute)

Explore further: Learn all about Pluto, the most famous dwarf planet

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Display comments: newest first

3.3 / 5 (3) Feb 26, 2015
Some simple definitions :
1. If it's big, round and shines, it's a star;
2. if it doesn't shine, it's a planet;
3. if it's not round, it's an asteroid.

Examples: The Moon is a satellite planet, Jupiter is a dominant gaseous planet with plenty of named satellite planets and satellite asteroids.
Uncle Ira
2.6 / 5 (5) Feb 26, 2015
Well golly gee David-Skippy. You and the other Pluto-Skippys complain about how few peoples gave Pluto the planetary boot, but there seems to be only fewer you guys doing all the Pluto whining. Pluto got the planetary boot, get over it. Why you don't find something good to carry-on about?

Hey, I almost forget this. Pluto is the one with silly looking pointy cap on his head, right? Well as long as he wears that silly looking pointy cap, he won't be allowed to be a real planet.
3 / 5 (2) Feb 26, 2015
The 3rd criteria should be changed to something like: Object is greater than 50% of the total known mass in it's orbital path. This definition certainly could be worded better and the percentage could certainly be agreed upon at a higher or lower level, but you get my point.

Classification is important and to include outliers which really do not fit in with the rest simply to do an emotional bias is detrimental.

Pluto (and other TNOs) and Ceres are without a doubt outliers when compared to the eight other planets. That's okay. It doesn't make them any less important, just different.
3 / 5 (2) Feb 26, 2015
It should only be a planet if it has some type of atmosphere.
3.4 / 5 (5) Feb 26, 2015
I say: the only planets are the ones the Ancients named. Anything after Saturn is an abomination to astrology... I mean astronomy. JUST SAY NO TO URANUS AND NEPTUNE
3 / 5 (2) Feb 26, 2015
"Classification is important ...".

Uh, why?

Science Officer
3 / 5 (2) Feb 26, 2015
Life should not be an incomplete sentence. How much longer must we live with only,
My very excellent mother just served us nine........"
2.3 / 5 (3) Feb 26, 2015
Life should not be an incomplete sentence. How much longer must we live with only,
My very excellent mother just served us nine........"
You are just getting too old.
5 / 5 (2) Feb 26, 2015
If one were to take the IAU definition of a planet at its word, our solar system would have only 2 planets: the only two sun-orbiting objects that do not have a cadre of sizable objects chasing them around their orbits. We usually call them moons, and they really deserve more respect than to be so totally dismissed as they are in what the IAU euphemistically calls a "definition".
5 / 5 (1) Feb 27, 2015
The efforts of a very small clique of Pluto-haters within the International Astronomical Union (IAU) plutoed Pluto in 2006.

God, I love dry humor.

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