Powered by OpenAIRE graph
Found an issue? Give us feedback
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ HAL-INSUarrow_drop_down
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
HAL-INSU
Doctoral thesis . 1997
Data sources: HAL-INSU
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
HAL Sorbonne Université
Doctoral thesis . 1997
versions View all 3 versions
addClaim

Compositional evolution and rotational properties of the asteroids

Authors: Birlan, Mirel;

Compositional evolution and rotational properties of the asteroids

Abstract

Les astéroïdes forment une population d'objets datant des premiers instants de la formation du système solaire. La connaissance de leurs propriétés devrait nous permettre de remonter aux conditions qui régnaient dans le système solaire primitif. Afin de mieux connaitre la population astéroïdale et de concevoir des modèles physiques correspondants, il est important d'observer la surface des astéroïdes et leur minéralogie, d'étudier les phénomènes de transfert radiatif pour des objets dénués d'atmosphère, de déterminer leur période de rotation propre (synodique), leur forme, le sens de leur rotation, et d'explorer des astéroïdes « in situ » grâce aux sondes spatiales. Par la photométrie d'ouverture et l'imagerie CCD, je suis arrivé à établir les courbes de lumière et la période de rotation propre de 15 astéroïdes. Par une approche statistiques j'ai mis en évidence : I) que l'influence de la nouvelle calibration d'albédo IRAS sur les taxonomies modernes n'est pas très grande ; II) que l'extension jusqu'à 2,5 m de l'intervalle spectral utilise dans l'analyse statistique nous permet d'étudier les structures possibles à l'intérieur des classes taxonomiques ; III) qu'un développement de l'algorithme statistique employé, permet de trouver les caractéristiques d'astéroïdes décrits par un nombre de variables inférieur à celui utilisé pour obtenir la taxonomie de référence.

Asteroids are believed to be remnant planetesimals from the crucial period of the planetary formation. The knowledge of their present properties can help us to understand the primordial processes which governed the evolution of the Solar System immediately after the collapse of the planetary nebula and before the formation of the planets. The mineralogy of their surfaces, the mechanisms of radiative transfer of the atmosphere-less bodies, the computing of their synodic periods, shapes and spins, as well as the “in situ” observations by spacecrafts, will help us to understand the asteroidal population. The lightcurves and synodical periods for 15 asteroids have been observed by photometrical and CCD photometry. By statistical analysis I found that : I) there is a low influence of the new IRAS albedo on the modern taxonomies ; II) the enlargement of the spectral interval helps us to find some substructures into taxonomic classes ; III) the extension of the G-mode algorithm allows us to classify more than 400 asteroids with an incomplete data-set.

Country
France
Keywords

Photometry, [SDU] Sciences of the Universe [physics], Charge Coupled Device, Astéroïdes, Capteurs CCD, Photométrie, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], Asteroids

  • BIP!
    Impact byBIP!
    selected citations
    These citations are derived from selected sources.
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
Powered by OpenAIRE graph
Found an issue? Give us feedback
selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green