Team Finds Oldest Known Asteroids

March 20, 2008
Team Finds Oldest Known Asteroids
Sample #3509 of the CV3 meteorite Allende sawed into ~ 1 cm thick slabs (a cm-sized cube marked ´T´ is included for scale). Refractory inclusions suitable for both thin sectioning and crushing into powders were identified as shown here for slabs number 5 and 6. After recording their locations, CAIs were cored out from slabs and both thin sections and thick butts were produced. Part of the remaining sample was carefully excavated to avoid contamination from matrix materials and crushed into powders for spectral measurements. Credit: University of Maryland

Using visible and infrared data collected from telescopes on Hawaii’s Mauna Kea, a team of scientists, led by the University of Maryland’s Jessica Sunshine, have identified three asteroids that appear to be among our Solar System’s oldest objects.

Evidence indicates that these ancient asteroids are relatively unchanged since they formed some 4.55 billion years ago and are older than the oldest meteorites ever found on Earth, say Maryland’s Sunshine and colleagues from the City University of New York, the Smithsonian Institution, and the University of Hawaii. Their findings will be published in this week’s edition of Science Express.

“We have identified asteroids that are not represented in our meteorite collection and which date from the earliest periods of the Solar System,” said Sunshine, a senior research scientist in the University of Maryland’s department of astronomy. “These asteroids are prime candidates for future space missions that could collect and return samples to Earth providing a more detailed understanding of the Solar System’s first few millions of years.”

In the Beginning

At the beginning of the Solar System, there was just a disk-shaped cloud of hot gas, the solar nebula. When gasses on the edge of the early nebula began to cool, the first materials to condense into solid particles were rich in the elements calcium and aluminum. As the gasses cooled further, other materials also began to condense. Eventually the different types of solid particles clumped together to form the common building blocks of comets, asteroids, and planets. Astronomers have thought that at least some of the Solar System’s oldest asteroids should be more enriched in calcium and aluminum, but, until the current study, none had been identified.

Meteorites found on Earth do contain small amounts of these earliest condensing materials. As seen in meteorites, these bright white ancient materials, the so-called calcium, aluminum-rich inclusions, or CAIs, can be as large as a centimeter in diameter. Scientists, in fact, long have used the age of CAIs to define the age of the Solar System.

“The fall of the Allende meteorite in 1969 initiated a revolution in the study of the early Solar System,” said Tim McCoy, curator of the national meteorite collection at the Smithsonian's National Museum of Natural History. “It was at that time scientists first recognized that the remarkable white inclusions -- later called calcium, aluminum-rich inclusions-- which were found in this meteorite, matched many of the properties expected of early Solar System condensates.


“I find it amazing that it took us nearly 40 years to collect spectra of these [CAI-rich] objects and that those spectra would now initiate another revolution, pointing us to the asteroids that record this earliest stage in the history of our Solar System,” said McCoy.

Sunshine and McCoy, with colleagues Harold Connolly, Jr, City University of New York; Bobby Bus, Institute for Astronomy, University of Hawaii, Hilo; and Lauren La Croix, Smithsonian Institution, used the SpeX instrument at the NASA Infrared Telescope Facility in Hawaii to look at the surface of asteroids for evidence of the presence of such early bits of high-temperature rock. In particular, they looked for spectral “fingerprints” indicative of the presence of CAIs. Because different minerals have different reflective properties, the spectrum, or color of light reflected from a surface, reveals information about its composition enabling telescopic compositional analysis.

In their paper, Sunshine and colleagues quantitatively compare the spectral signatures of asteroid surfaces and CAIs in meteorites from the Smithsonian's National Museum of Natural History collection. “Several CAI-rich asteroids have been identified that contain 2-3 times more CAI material than any known meteorite,” Sunshine said. “Thus it appears ancient asteroids have indeed survived, and we know where they are.”

Source: University of Maryland

Explore further: Cataclysm at Meteor Crater: Crystal sheds light on Earth, moon, Mars (Update)

Related Stories

The case of the missing craters

July 26, 2016

When NASA's Dawn spacecraft arrived to orbit the dwarf planet Ceres in March 2015, mission scientists expected to find a heavily cratered body generally resembling the protoplanet Vesta, Dawn's previous port of call.

NASA instrument to use X-rays to map an asteroid

July 12, 2016

NASA's OSIRIS-REx spacecraft will launch September 2016 and travel to the near-Earth asteroid Bennu to harvest a sample of surface material and return it to Earth for study. But before the science team selects a sample site, ...

Active asteroid 324P/La Sagra observed by Hubble

July 5, 2016

(Phys.org)—The renowned Hubble Space Telescope (HST) plays a leading role in uncovering distant locations of the universe, but it could be also a helpful tool for studying nearby objects, like space rocks whizzing through ...

NASA sails full-speed ahead in solar system exploration

July 18, 2016

NASA's Juno is now poised to shine a spotlight on the origins and interior structure of the largest planet in our solar system. As we wait for Juno's first close-up images of Jupiter (to be taken Aug. 27 during the spacecraft's ...

Recommended for you

NASA's next planet hunter will look closer to home

July 28, 2016

As the search for life on distant planets heats up, NASA's Transiting Exoplanet Survey Satellite (TESS) is bringing this hunt closer to home. Launching in 2017-2018, TESS will identify planets orbiting the brightest stars ...

Jupiter's great red spot heats planet's upper atmosphere

July 27, 2016

Researchers from Boston University's (BU) Center for Space Physics report today in Nature that Jupiter's Great Red Spot may provide the mysterious source of energy required to heat the planet's upper atmosphere to the unusually ...

Star's intense radiation beams whip neighboring red dwarf

July 27, 2016

New research from the University of Warwick finds a new type of exotic binary star, in which a rapidly-spinning burnt-out stellar remnant called a white dwarf sweeps powerful beams of particles and radiation over its nearby ...

Seven new embedded clusters detected in the Galactic halo

July 25, 2016

(Phys.org)—A team of Brazilian astronomers, led by Denilso Camargo of the Federal University of Rio Grande do Sul in Porto Alegre, has discovered seven new embedded clusters located unusually far away from the Milky Way's ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.