Asteroid shapes and thermal properties from combined optical and mid-infrared photometry inversion

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10361079" target="_blank" >RIV/00216208:11320/17:10361079 - isvavai.cz</a>

Result on the web

<a href="https://arxiv.org/abs/1706.01232" target="_blank" >https://arxiv.org/abs/1706.01232</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201730868" target="_blank" >10.1051/0004-6361/201730868</a>

Result language

angličtina

Original language name

Asteroid shapes and thermal properties from combined optical and mid-infrared photometry inversion

Original language description

Optical lightcurves can be used for the shape and spin reconstruction of asteroids. Due to unknown albedo, these models are scale-free. When thermal infrared data are available, they can be used for scaling the shape models and for deriving thermophysical properties of the surface by applying a thermophysical model. We introduce a new method of simultaneous inversion of optical and thermal infrared data that allows the size of an asteroid to be derived along with its shape and spin state. The method optimizes all relevant parameters (shape and its size, spin state, light-scattering properties, thermal inertia, surface roughness) by gradient-based optimization. The thermal emission is computed by solving the 1-D heat diffusion equation. Calibrated optical photometry and thermal fluxes at different wavelengths are needed as input data. We demonstrate the reliability and test the accuracy of the method on selected targets with different amount and quality of data. Our results in general agree with those obtained by independent methods. Combining optical and thermal data into one inversion method opens a new possibility for processing photometry from large optical sky surveys with the data from WISE. It also provides more realistic estimates of errors of thermophysical parameters.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA15-04816S" target="_blank" >GA15-04816S: A big picture of the main asteroid belt - physical properties of asteroids derived by inversion of optical and infrared photometry</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy &amp; Astrophysics [online]

ISSN

1432-0746

e-ISSN

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Volume of the periodical

604

Issue of the periodical within the volume

07

Country of publishing house

FR - FRANCE

Number of pages

8

Pages from-to

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UT code for WoS article

000408480100117

EID of the result in the Scopus database

2-s2.0-85026524430