'Dwarf planet' Ceres spawns giant mystery (Update)

'Dwarf planet' Ceres spawns giant mystery
This map-projected view of Ceres was created from images taken by NASA's Dawn spacecraft during its initial approach to the dwarf planet, prior to being captured into orbit in March 2015. The map is an enhanced color view that offers an expanded range of the colors visible to human eyes. Scientists use this technique in order to highlight subtle color differences across Ceres. This can provide valuable insights into the physical properties and composition of materials on the surface. For example, scientists have not established clear connections between impact craters and the different colors visible here, but they are investigating this possibility. Images taken using blue (440 nanometers), green (550 nanometers) and infrared (920 nanometers) spectral filters were combined to create the map. The filters were assigned to color channels in reverse order, compared to natural color; in other words, the short-wavelength blue images were assigned to the red color channel and the long-wavelength infrared images are assigned to the blue color channel. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

First classified a planet, then an asteroid and then a "dwarf planet" with some traits of a moon—the more scientists learn about Ceres, the weirder it becomes.

And new observations of the sphere of rock and ice circling our Sun between Mars and Jupiter have added to the mystery, researchers said Monday.

Astrophysicists have been looking to a $473-million (446-million-euro) mission to test theories that Ceres is a water-rich planetary "embryo"—a relic from the birth of the Solar System some 4.5 billion years ago.

But an early batch of data from NASA's Dawn probe, unveiled at a conference of the European Geosciences Union (EGU), may have made the Ceres riddle even greater.

In orbit around Ceres since March 6 after a seven-and-a-half-year trek, Dawn peered at two bright spots on its surface deemed to be telltales of its chemical and physical ID.

But instead of explaining the spots, analysis found the two seemed to "behave distinctly differently," said Federico Tosi, who works on Dawn's Visible and Infrared Mapping Spectrometer (VIR).

While Spot 1 is colder than its immediate surroundings, Spot 5 is not.

The spots are two of a known dozen or so which on photographs taken by Dawn resemble lights shining on a dull grey surface.

Ceres travels at some 414 million kilometres (260 million miles) from the Sun, taking 4.61 Earth years to complete one orbit.

About 950 km (590 miles) wide, it is the biggest object in the asteroid belt—large enough for gravity to have moulded its shape into a ball.

With VIR, the Dawn team have been able to put together images at different wavelengths of light, Tosi told journalists.

This image is taken by NASA's Dawn spacecraft of dwarf planet Ceres on February 19, 2015 from a distance of nearly 29,000 miles
This image is taken by NASA's Dawn spacecraft of dwarf planet Ceres on February 19, 2015 from a distance of nearly 29,000 miles

One picture, as seen by the human eye, shows Ceres as a "dark and brownish" ball with both white spots clearly visible.

But in thermal images, Spot 1 becomes a dark spot on a reddish ball, indicating it was cooler than the rest of the surface, said Tosi.

The "biggest surprise", he added, was that Spot 5 simply disappeared on the thermal image.

"For sure, we have bright spots on the surface of Ceres which, at least from a thermal perspective, seem to behave in different ways."

Theories about what the spots are range from ice to "hydrated minerals"—water not in pure ice form but absorbed by minerals.

Ice would be difficult to explain, though, as Ceres inhabits a zone not quite distant enough from the Sun to allow "stable ice" on the surface, said Tosi of the National Institute for Astrophysics in Rome.

Missing craters

Just as intriguing is that Ceres is very unlike its near neighbour Vesta, an asteroid which Dawn studied in 2011 and 2012.

Vesta is bright and reflects much of the Sun's light, while Ceres is dark—a contrast that says these bodies have experienced very different space odysseys.

Thia NASA image obtained on March 6, 2015 shows Ceres, taken by the Dawn spacecraft on March 1, just a few days before the missi
Thia NASA image obtained on March 6, 2015 shows Ceres, taken by the Dawn spacecraft on March 1, just a few days before the mission achieved orbit

The team also found fewer large craters on Ceres than observations of Vesta suggested they should.

"When we compared the size of the craters on Ceres with those on Vesta, we're missing a number of large craters, the number we would expect," said Christopher Russell, Dawn's principal investigator.

Pockmarks on the surface did, however, suggest Ceres had a "violent collisional history," said team member Martin Hoffman from the Max Planck Institute for Solar System Research in Goettingen, Germany.

Put together, the case for Ceres as a baby planet that never made it to adulthood remains, for now, in limbo.

'Dwarf planet' Ceres spawns giant mystery
These images, from Dawn's visible and infrared mapping spectrometer (VIR), highlight two regions on Ceres containing bright spots. The top images show a region scientists have labeled "1" and the bottom images show the region labeled "5." Region 5 contains the brightest spots on Ceres. VIR has been examining the relative temperatures of features on Ceres' surface. Preliminary examination suggests that region 1 is cooler than the rest of Ceres' surface, but region 5 appears to be located in a region that is similar in temperature to its surroundings. Credit: NASA/JPL-Caltech/UCLA/ASI/INAF

More may become clear in the coming months when Dawn, which until now has been on Ceres' dark side, moves closer to probe its surface composition and temperature.

The first object in the main asteroid belt to be discovered, Ceres was observed in 1801 by a Sicilian astronomer, Father Giuseppe Piazzi.

Believing he had seen a planet, Piazzi named his after the Roman goddess of harvests and Sicily's patron saint.

After more, but smaller objects turned up, Ceres was downgraded to an asteroid only to get a status boost in 2006, becoming a "dwarf planet."


Explore further

Mysterious dwarf planet Ceres gets ready for the spotlight

© 2015 AFP

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User comments

Apr 14, 2015
I can't imagine how the standard model is going to ad hoc an explanation for an obvious discharging event, which is producing a depression similar to those covering planetary surfaces misinterpreted as impact craters. The more energetic arc is in the center, with secondary arcs on its edge. This is the mechanism for bulls-eye craters, craters with central peaks, and small craters positioned on the edge of a larger crater.


Apr 14, 2015
@rossim22

It's "an obvious discharging event" if you are delusional and uneducated.

Apr 14, 2015
@rossim22

It's "an obvious discharging event" if you are delusional and uneducated.

Even the educated have no idea. Go sniff some agent orange. You're coming down off your high.

Apr 14, 2015
@rossim22

It's "an obvious discharging event" if you are delusional and uneducated.

Even the educated have no idea. Go sniff some agent orange. You're coming down off your high.


Your lack of an education is glaringly obvious.

Apr 14, 2015
It is obviously an ET base :)

Apr 14, 2015
@rossim22

It's "an obvious discharging event" if you are delusional and uneducated.


So what is it? A reflection on a slab of ice? An imaginary 'cryovolcano'? For once, give me some falsifiable prediction of the standard model concerning this phenomena.

Apr 14, 2015
@rossim22

Your comment just reinforces my original comment about your gross ignorance. Impact cratering has been observed in nature and replicated in the lab. It is a process that is well understood, it is mature science.

On the other hand Electric Discharge Machining has NEVER been observed in nature and relies on debunked pseudoscience.

Apr 15, 2015
@rossim22

Your comment just reinforces my original comment about your gross ignorance. Impact cratering has been observed in nature and replicated in the lab. It is a process that is well understood, it is mature science.


Please show me an observation of a natural impactor leaving a bulls-eye crater, geometric crater, crater with central peak, or crater with sharply cut walls and smooth flat floors.

There is no doubt that impact craters exist, your straw man argument does not apply as I don't disagree. However, impacts are a small fraction of the craters we observe. Look at the polar regions of any planetary body and you see a distinct pattern of overlapping craters in a circular or spiral configuration. There is a single, massive crater (relative to diameter) of many moons in the solar system which an impactor would have destroyed. You don't acknowledge the possibility of an electrical influence and that is unscientific.

Apr 15, 2015
@rossim22

You cant provide EVIDENCE of a single crater caused by electric discharge, not a one.

https://janus.ast...pes.html
https://www.googl...dpr=1.75
http://www.enchan...rs.shtml
http://www.passc....cts.html
https://scholar.g...as_sdtp=
http://adsabs.har....9.3843G
http://www.memin....p-1.html
http://www.impact...pproach/
https://spiral.im...2014.pdf

I could spend the rest of the night providing links but we both know you're stuck in conjecture without any supporting evidence.

Apr 15, 2015
Cold War era space debris.

Apr 15, 2015
Traffic lights on the Galactic Highway.

Apr 16, 2015
I guess phys.org didn't get the note about new Ceres pics, hmmm.

Apr 17, 2015
This is off topic but I bet there are some really wild life forms out in space somewhere. I imagine some are truly spectacular. It's also cool as hell to think about sceneries that could exist on planets with different terrain combined with crazy sunsets, exotic weather, oceans of other liquids, atmospheres reflecting different colors, and auroras. I hope younger generations stay involved in space exploration and who knows maybe some day the budget will be what it should be.

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