The asteroid 24 Themis is the largest member of the Themis dynamical family. including eight previously studied by Licandro et al. Themis family (th'ee -miss) A Hirayama family of asteroids located in the outer main belt at a distance of 3.2 AU from the Sun, most members having diameters less than 60 km.They all have low albedos, are of C-type, and correspond to different metamorphic grades of carbonaceous chondrite material.
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Overall, our results suggest the Themis and Veritas families are primitive asteroids with variation in composition and/or regolith properties within both families. (2012), and nine Veritas-family asteroids, for a to-tal of 20 asteroids in our sample. We used thermal modeling to derive diameters, beaming parameters and albedos for our sample. We analyzed the 5 – 14 µm Spitzer Space Telescope spectra of 11 Themis-family asteroids, including eight previously studied by Licandro et al. Published by Elsevier Inc. All rights reserved. We detect a broad 10-μm emission feature, attributed to fine-grained and/or porous silicate regolith, in all 11 Themis-family spectra and six of nine Veritas-family asteroids, Spectral contrast of the 10-µm silicate emission feature is correlated with beaming parameter and rotation period in the Themis family, and may be related to near-infrared spectral slope for both families. https://encyclopedia2.thefreedictionary.com/Themis+family, The target asteroids span a range of types but within the set covered are five objects belonging to the, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content. and organic material on the asteroid 24 Themis, a detection that nas been independently confirmed2_ 24 T nemis belongs to the same dynamical family as three ot the tive known MBCs, and the presence ot ice on 24 Tnemis is strong evidence that it also is present in the MBCs. We see no correlations of 10-µm emission with diameter or albedo for either family. We conclude that water ice is more common on asteroids The Veritas and Themis asteroid families: 5–14. (2012), and nine Veritas-family asteroids, for a total of 20 asteroids in our sample. The 12-µm spectral region is similar to that of less altered primitive meteorites. We detect a broad 10-µm emission feature, attributed to fine-grained and/or porous silicate regolith, in all 11 Themis-family spectra and six of nine Veritas-family asteroids, with 10-µm spectral contrast ranging from 1% ± 0.1% to 8.5% ± 0.9%. We use cookies to help provide and enhance our service and tailor content and ads. Asteroids in both families have beaming parameters near unity and geometric albedos in the range 0.03 – 0.14. We analyze the thermal properties and emissivity spectra of these asteroids. We detect a broad 10-µm emission feature, attributed to fine-grained and/or porous silicate regolith, in all 11 Themis-family spectra and six of nine Veritas-family asteroids, with 10-µm spectral contrast ranging from 1% ± 0.1% to 8.5% ± 0.9%. [1]. We use cookies to help provide and enhance our service and tailor content and ads. Themis and Veritas are two compositionally primitive families residing in the outer main belt, with low inclinations and low eccentricities ().The Veritas asteroid family is dynamically young, 8.3 ± 0.5 Myr (Nesvorný et al., 2003).In a study of visible (0.4 – 0.9 µm) spectroscopy from large surveys, Mothé-Diniz et al. By continuing you agree to the use of cookies. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. We detect a broad 10-µm emission feature, attributed to fine-grained and/or porous silicate regolith, in all 11 Themis-family spectra and six of nine Veritas-family asteroids, with 10-µm spectral contrast ranging from 1% ± 0.1% to 8.5% ± 0.9%.
https://doi.org/10.1016/j.icarus.2016.01.008.
Here, we aim to better understand the composition and physical properties of two primitive families with vastly different ages: ancient Themis (∼2.5 Gyr) and young Veritas (∼8 Myr). Comparison with laboratory spectra of primitive meteorites suggests these asteroids are similar to meteorites with relatively low abundances of phyllosilicates. The asteroid 24 Themis has organic material and a layer of frost, bolstering theories that asteroids could have seeded Earth with both water and the precursors to … We present Spitzer spectra of asteroids from the Themis and Veritas families. The Veritas and Themis asteroid families: 5–14. We used thermal modeling to derive diameters, beaming parameters and albedos for our sample. The Themis family is charac-terized by asteroids with 3.05 a 3.22 AU, 0.12 e 0.19, and 0:7o i 2:22 o [2] and spec- However, examination of Eos and other family members in the infrared show some differences with the S-type, thus why they have their own category (K-type asteroids). Spectroscopic investigations of primitive asteroid families constrain family evolution and composition and conditions in the solar nebula, and reveal information about past and present distributions of volatiles in the solar system. https://doi.org/10.1016/j.icarus.2016.01.008. Instead, researchers hope to look at other asteroids in the Themis family to see whether more asteroids hold water -- or whether scientists just got lucky. Comparison with laboratory spectra of primitive meteorites suggests these asteroids are similar to meteorites with relatively low abundances of phyllosilicates. We see no correlations of 10-µm emission with diameter or albedo for either family. For Themis, 10-µm contrast is correlated with beaming parameter and rotation rate. Copyright © 2020 Elsevier B.V. or its licensors or contributors. We present Spitzer spectra of asteroids from the Themis and Veritas families. Asteroids in both families have beaming parameters near unity and geometric albedos in the range 0.03 – 0.14. Copyright © 2016 Elsevier Inc. Copyright © 2020 Elsevier B.V. or its licensors or contributors.
However, this model fails in the case of the long-lived population which was thought to be created by Yarkovsky-induced injection of the nearby Themis family asteroids that exhibit similar inclinations as the B-island asteroids. We detect a broad 10-μm emission feature, attributed to fine-grained and/or porous silicate regolith, in all 11 Themis-family spectra and six of nine Veritas-family asteroids, with 10-μm spectral contrast ranging from 1% ± 0.1% to 8.5% ± 0.9%. We analyze the thermal properties and emissivity spectra of these asteroids.
For Themis, 10-µm contrast is correlated with beaming parameter and rotation rate. Themis is one of the most statistically reliable fam-ily in the asteroid belt. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only.
Henry H. …
We used thermal modeling to derive diameters, beaming parameters and albedos for our sample. Spectral \contrast at 10-µm ranges from no detection to 8.5% ± 0.9%. Spectral \contrast at 10-µm ranges from no detection to 8.5% ± 0.9%. (2012), and nine Veritas-family asteroids, for a total of 20 asteroids in our sample. First discovered by Hirayama (1918), it has been identied as a family in all sub-sequent works, and has 550 members as determined by Zappalà et al. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Visible and near-infrared studies of primitive asteroid families have shown spectral diversity between and within families. Here, we aim to better understand the composition and physical properties of two primitive families with vastly different ages: ancient Themis (∼2.5 Gyr) and young Veritas (∼8 Myr). Overall, our results suggest the Themis and Veritas families are primitive asteroids with variation in composition and/or regolith properties within both families. The 12-µm spectral region is similar to that of less altered primitive meteorites. We analyzed the 5 – 14 µm Spitzer Space Telescope spectra of 11 Themis-family asteroids, including eight previously studied by Licandro et al. Visible and near-infrared studies of primitive asteroid families have shown spectral diversity between and within families. Spectral contrast of the 10-µm silicate emission feature is correlated with beaming parameter and rotation period in the Themis family, and may be related to near-infrared spectral slope for both families.
Spectroscopic investigations of primitive asteroid families constrain family evolution and composition and conditions in the solar nebula, and reveal information about past and present distributions of volatiles in the solar system. We used thermal modeling to derive diameters, beaming parameters and albedos for our sample. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
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