AVAST survey 0.4–1.0 μm spectroscopy of igneous asteroids in the inner and middle main belt

Solontoi, Michael; Hammergren, M.; Gyuk, G.; Puckett, Andrew W.

doi:10.1016/j.icarus.2012.05.035

Cited by 27 publications

(31 citation statements)

References 45 publications

(70 reference statements)

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“…Overall, the method correctly classified most of the spectrally confirmed objects and shows good agreement in candidate selection with the methods by Moskovitz et al (2008a) and Roig & Gil-Hutton (2006). There is less overlap with the basaltic candidates indicated by Solontoi et al (2012) though. Our method predicted the taxonomic complex correctly for 88% of the objects observed listed in Table A.1.…”

Section: Comparison With Other Methods and Validationmentioning

confidence: 64%

“…To compare our method with those already available in the literature, we performed classification of basaltic candidates indicated in Moskovitz et al (2008a), Roig & Gil-Hutton (2006) and Solontoi et al (2012). In particular, we compared the classification for all the numbered asteroids in the candidate lists that have all the features available (colors, albedo, G 12 s).…”

Section: Comparison With Other Methods and Validationmentioning

confidence: 99%

“…In particular, the Vp class showed a clustering around the Vesta family and also a scatter in the mid and outer main belt. Another method by Solontoi et al (2012) primarily uses the i − z color index to find candidate V-type asteroids. In that method all the asteroids fulfilling the criteria i − z < −0.2 were clasified as possible V-type candidates.…”

Section: Introductionmentioning

confidence: 99%

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Selecting asteroids for a targeted spectroscopic survey

Oszkiewicz

Kwiatkowski

Tomov

et al. 2014

A&A

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Context. Asteroid spectroscopy reflects surface mineralogy. There are a few thousand asteroids whose surfaces have been observed spectrally. Determining their surface properties is important for many practical and scientific applications, such as developing impact deflection strategies or studying the history and evolution of the solar system and planet formation. Aims. The aim of this study is to develop a preselection method that can be used to search for asteroids of any taxonomic complex. The method could then be utilized in multiple applications, such as searching for the missing V-types or looking for primitive asteroids. Methods. We used the Bayes Naive Classifier combined with observations obtained in the course of the Sloan Digital Sky Survey and the Wide-field Infrared Survey Explorer surveys, as well as a database of asteroid phase curves for asteroids with a known taxonomic type. With this new classification method, we selected a number of possible V-type candidates. Some of the candidates were then spectrally observed at the Nordic Optical Telescope and South African Large Telescope.Results. We developed and tested the new preselection method. We found three asteroids in the mid-to-outer main belt that probably have differentiated types. Near-infrared observations are still required to confirm this discovery. As in other studies we found that V-type candidates cluster around the Vesta family and are rare in the mid-to-outer main belt.Conclusions. The new method shows that even largely explored large databases when combined could still be exploited further in, for example, solving the missing dunite problem.

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Section: Comparison With Other Methods and Validationmentioning

confidence: 64%

Section: Comparison With Other Methods and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selecting asteroids for a targeted spectroscopic survey

Oszkiewicz

Kwiatkowski

Tomov

et al. 2014

A&A

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“…For example, predicted A-type asteroids are often found to be S-complex objects after the addition of NIR wavelength data (Lucas et al 2012). As a result of the distinct spectral characteristics in the visible wavelengths, the confirmation rates for the SDSS-predicted V-types are much higher (for example, the survey by Solontoi et al (2012) achieved a confirmation rate of 77%) and therefore are more reliable.…”

Section: Predicted Taxonomic Distributionmentioning

confidence: 99%

Differentiation signatures in the Flora region

Oszkiewicz

Kankiewicz

Wlodarczyk³

et al. 2015

A&A

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Context. Most asteroid families are very homogeneous in physical properties. Some show greater diversity, however. The Flora family is the most intriguing of them. The Flora family is spread widely in the inner main belt, has a rich collisional history, and is one of the most taxonomically diverse regions in the main belt. As a result of its proximity to the asteroid (4) Vesta (the only currently known intact differentiated asteroid) and its family, migration between the two regions is possible. This dynamical path is one of the counter arguments to the hypothesis that there may be traces of a differentiated parent body other than Vesta in the inner main belt region. We here investigate the possibility that some of the V-and A-types (commonly interpreted as basaltoids and dunites -parts of the mantle and crust of differentiated parent bodies) in the Flora dynamical region are not dynamically connected to Vesta. Aims. The goal of this study is to investigate asteroids in the Flora dynamical region that may be witness to the differentiation of a parent body other than (4) Vesta. In particular, we aim at predicting which asteroids may be fragments of a differentiated body or bodies (taxonomical V-types). We also investigate their possible dynamical linkage to the nearby Vesta family. Methods. To predict the taxonomic types of asteroids we used the naive Bayes classifier. We studied their dynamical past through numerical integration including gravitational and Yarkovsky forces. Each asteroid was cloned, and average orbital elements were computed at each step. When possible, we used observationally constrained physical parameters for the thermal forces. Results. Most of the asteroids in the Flora region are predicted to originate from the S-complex (around 47.8%). Tens of asteroids with potentially differential origins are identified in the region, including 164 potential V-types. We investigated the dynamical evolution of selected objects to examine possible linkages of selected asteroids with the nearby Vesta family. In addition to the candidate differentiated objects, we also studied the dynamical evolution of those asteroids from the Flora family for which spectroscopic classification exist. In particular, we used all the physical parameters available for asteroid (809) Lundia to show that the asteroid is unlikely to originate in the Vesta region and that it resided on a stable orbit in the Flora dynamical region for at least 80 My. Its observationally constrained prograde rotation shows that asteroid (809) Lundia is unlikely to be a former Vesta family member. Conclusions. We found that the V-type candidates are plentiful in the Flora dynamical region. Dynamical investigations of selected objects showed that some of these objects were likely not connected to asteroid (4) Vesta and its family for at least 100 My. This adds another piece of evidence to the hypothesis that there are multiple differentiated parent bodies.

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“…Searches for basaltic (crustal) differentiated material throughout the main belt have proven successful (e.g., Moskovitz et al 2008;Solontoi et al 2012;Leith et al 2017). Basaltic asteroids are easily identified spectrally in both the visible and near-infrared wavelengths by the deep and narrow one-micron and deep and broad two-micron absorption bands.…”

Section: Introductionmentioning

confidence: 99%

Olivine-dominated A-type asteroids in the main belt: Distribution, abundance and relation to families

DeMeo

Polishook

Carry

et al. 2019

Icarus

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Differentiated asteroids are rare in the main asteroid belt despite evidence for ∼100 distinct differentiated bodies in the meteorite record. We have sought to understand why so few main-belt asteroids differentiated and where those differentiated bodies or fragments reside. Using the Sloan Digital Sky Survey (SDSS) to search for a needle in a haystack we identify spectral A-type asteroid candidates, olivine-dominated asteroids that may represent mantle material of differentiated bodies. We have performed a near-infrared spectral survey with SpeX on the NASA IRTF and FIRE on the Magellan Telescope.We report results from having doubled the number of known A-type asteroids. We deduce a new estimate for the overall abundance and distribution of this class of olivine-dominated asteroids. We find A-type asteroids account for less than 0.16% of all main-belt objects larger than 2 km and estimate there are a total of ∼600 A-type asteroids above that size. They are found rather evenly distributed throughout the main belt, are even detected at the distance of the Cybele region, and have no statistically significant concentration in any asteroid family. We conclude the most likely implication is the few fragments of olivine-dominated material in the main belt did not form locally, but instead were implanted as collisional fragments of bodies that formed elsewhere.

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AVAST survey 0.4–1.0 μm spectroscopy of igneous asteroids in the inner and middle main belt

Cited by 27 publications

References 45 publications

Selecting asteroids for a targeted spectroscopic survey

Selecting asteroids for a targeted spectroscopic survey

Differentiation signatures in the Flora region

Olivine-dominated A-type asteroids in the main belt: Distribution, abundance and relation to families

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