A Southwest Research Institute-led team of scientists has identified a potentially new meteorite parent asteroid by studying a small shard of a meteorite that arrived on Earth a dozen years ago. The composition of a piece of the meteorite Almahata Sitta (AhS) indicates that its parent body was an asteroid roughly the size of Ceres, the largest object in the main asteroid belt, and formed in the presence of water under intermediate temperatures and pressures.
Southwest research institute staff scientist Dr. Vicky Hamilton, the first author of a paper published in Nature Astronomy outlining this research, said:
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“Carbonaceous chondrite (CC) meteorites record the geological activity during the earliest stages of the Solar System and provide insight into their parent bodies’ histories. Some of these meteorites are dominated by minerals providing evidence for exposure to water at low temperatures and pressures.
“The composition of other meteorites points to heating in the absence of water. Evidence for metamorphism in the presence of water at intermediate conditions has been virtually absent, until now.”
Most asteroids reside in the belt between Mars and Jupiter
Asteroids — and the meteors and meteorites that sometimes come from them — are leftovers from the formation of our Solar System 4.6 billion years ago. Most reside in the main asteroid belt between the orbits of Mars and Jupiter, but collisions and other events have broken them up and ejected remnants into the inner Solar System. In 2008, a 9-ton, 13-foot diameter asteroid entered Earth’s atmosphere, exploding into some 600 meteorites over Sudan. This marked the first time scientists predicted an asteroid impact prior to entry and allowed the recovery of 23 pounds of samples. Hamilton said:
“We were allocated a 50-milligram sample of AhS to study. We mounted and polished the tiny shard and used an infrared microscope to examine its composition. Spectral analysis identified a range of hydrated minerals, in particular amphibole, which points to intermediate temperatures and pressures and a prolonged period of aqueous alteration on a parent asteroid at least 400, and up to 1,100, miles in diameter.”
Amphiboles are rare in CC meteorites, having only been identified previously as a trace component in the Allende meteorite. Hamilton said:
“AhS is a serendipitous source of information about early Solar System materials that are not represented by CC meteorites in our collections.”
Orbital spectroscopy of asteroids Ryugu and Bennu visited by Japan’s Hayabusa2 and NASA’s OSIRIS-REx spacecraft this year is consistent with aqueously altered CC meteorites and suggests that both asteroids differ from most known meteorites in terms of their hydration state and evidence for large-scale, low-temperature hydrothermal processes. These missions have collected samples from the surfaces of the asteroids for return to Earth. Hamilton, who also serves on the OSIRIS-REx science team, said:
“If the compositions of the Hayabusa2 and OSIRIS-REx samples differ from what we have in our collections of meteorites, it could mean that their physical properties cause them to fail to survive the processes of ejection, transit and entry through Earth’s atmosphere, at least in their original geologic context.
“However, we think that there are more carbonaceous chondrite materials in the Solar System than are represented by our collections of meteorites.”
Provided by: Southwest Research Institute [Note: Materials may be edited for content and length.]