Discovery of a Basaltic Asteroid in the Outer Main Belt

Lazzaro, D.; Michtchenko, T. A.; Carvano, J. M.; Binzel, Richard P.; Bus, S. J.; Burbine, T. H.; Mothé-Diniz, T.; Florczak, M.; Angeli, Cláudia A.; Harris, Alan W.

doi:10.1126/science.288.5473.2033

Cited by 123 publications

(114 citation statements)

References 15 publications

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“…In the outer asteroid belt beyond 2.5 au, the only confirmed basaltic asteroid is (1459) Magnya, which has a semimajor axis of ∼3.14 au, is taxonomically classified as a V-type asteroid, and is thought to be too far from (4) Vesta to derive from that parent body (Lazzaro et al 2000). This asteroid also exhibits NIR spectral and mineralogical features that are consistent with a basaltic surface (Hardersen et al 2004).…”

Section: Introductionmentioning

confidence: 95%

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Hardersen

Reddy

Cloutis

et al. 2018

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Investigations of the main asteroid belt and efforts to constrain that population's physical characteristics involve the daunting task of studying hundreds of thousands of small bodies. Taxonomic systems are routinely employed to study the large-scale nature of the asteroid belt because they utilize common observational parameters, but asteroid taxonomies only define broadly observable properties and are not compositionally diagnostic. This work builds upon the results of work by Hardersen et al., which has the goal of constraining the abundance and distribution of basaltic asteroids throughout the main asteroid belt. We report on the near-infrared (NIR: 0.7 to 2.5 μm) reflectance spectra, surface mineralogical characterizations, analysis of spectral band parameters, and meteorite analogs for 33 V p asteroids. NIR reflectance spectroscopy is an effective remote sensing technique to detect most pyroxene group minerals, which are spectrally distinct with two very broad spectral absorptions at ∼0.9 and ∼1.9 μm. Combined with the results from Hardersen et al., we identify basaltic asteroids for ∼95% (39/41) of our inner-belt V p sample, but only ∼25% (2/8) of the outer-belt V p sample. Inner-belt basaltic asteroids are most likely associated with (4) Vesta and represent impact fragments ejected from previous collisions. Outerbelt V p asteroids exhibit disparate spectral, mineralogical, and meteorite analog characteristics and likely originate from diverse parent bodies. The discovery of two additional likely basaltic asteroids provides additional evidence for an outer-belt basaltic asteroid population.

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Section: Introductionmentioning

confidence: 95%

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Hardersen

Reddy

Cloutis

et al. 2018

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“…Most V-class asteroids that have been discovered are among the Vesta family and are known as Vestoids, although a few other objects have been identified throughout the main belt, such as 1459 Magnya (Lazzaro et al, 2000) and objects from the basaltic asteroid survey by Moskovitz et al (2008). The R-class, created for its sole member 349 Demboska by Tholen (1984), is similar to the V-class in that it displays deep 1-and 2-μm features, however the one- Similarly, many Bus S, Sq, and Sk objects become less clearly separated when their spectra extend to the near-infrared.…”

Section: The End Members: O Q R Vmentioning

confidence: 99%

An extension of the Bus asteroid taxonomy into the near-infrared

DeMeo

Binzel

Slivan

et al. 2009

Icarus

798

978

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The availability of asteroid spectral measurements extending to the near-infrared, resulting from the development of new telescopic instruments (such as SpeX; Rayner 2003), provides a new basis for classifying asteroid reflectance spectra. We present an asteroid taxonomy classification system based on reflectance spectrum characteristics for 371 asteroids measured over the wavelength range 0.45 to 2.45 microns.This system of 24 classes is constructed using principal component analysis, following most closely the visible wavelength taxonomy of Bus (1999), which itself builds upon the system of Tholen (1984)

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“…The spectral characteristics of Vesta conform to those of HEDs, an almost unique match (only one other basaltic asteroid, 1459 Magnya, has been identified in the main belt [Lazzaro et al, 2000], and it is not located in a position that should be easily sampled). With the discovery of small, impact-ejected "Vestoids" spanning the gap between Vesta's orbit [Binzel and Xu, 1993] and the 3/1 mean motion and ν 6 secular resonances with Jupiter which serve as escape hatches [Wisdom, 1985], the hypothesis that Vesta is the HED parent body has become widely accepted.…”

Section: Vestamentioning

confidence: 89%

Dawn: A journey in space and time

Russell¹,

Coradini²,

Christensen³

et al. 2004

Planetary and Space Science

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By successively orbiting both 4 Vesta and 1 Ceres the Dawn mission directly addresses the long-standing goals of understanding the origin and evolution of the solar system. Ceres and Vesta are two complementary terrestrial protoplanets (one apparently "wet" and the other "dry"), whose accretion was probably terminated by the formation of Jupiter. They provide a bridge in our understanding between the rocky bodies of the inner solar system and the icy bodies of the outer solar system. Ceres appears to be undifferentiated while Vesta has experienced significant heating and likely differentiation. Both formed very early in the history of the solar system and while suffering many impacts have remained intact, thereby retaining a record of events and processes from the time of planet formation. Detailed study of the geophysics and geochemistry of these two bodies provides critical benchmarks for early solar system conditions and processes that shaped its subsequent evolution. Dawn provides the missing context for both primitive and evolved meteoritic data, thus playing a central role in understanding terrestrial planet formation and the evolution of the asteroid belt. Dawn is to be launched in May 2006 arriving at Vesta in 2010 and Ceres in 2014, stopping at each to make 11 months of orbital measurements. The spacecraft uses solar electric propulsion, both in cruise and in orbit, to make most efficient use of its xenon propellant. The spacecraft carries a framing camera, visible and infrared mapping spectrometer, gamma ray/neutron spectrometer, magnetometer, and radio science.3

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Discovery of a Basaltic Asteroid in the Outer Main Belt

Cited by 123 publications

References 15 publications

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

An extension of the Bus asteroid taxonomy into the near-infrared

Dawn: A journey in space and time

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Discovery of a Basaltic Asteroid in the Outer Main Belt

Cited by 123 publications

References 15 publications

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 Vp-type Asteroids

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 Vp-type Asteroids

An extension of the Bus asteroid taxonomy into the near-infrared

Dawn: A journey in space and time

Contact Info

Product

Resources

About

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids