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Träfflista för sökning "WFRF:(Josselin Eric) "

Sökning: WFRF:(Josselin Eric)

  • Resultat 1-3 av 3
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1.
  • Farnocchia, Davide, et al. (författare)
  • The Second International Asteroid Warning Network Timing Campaign: 2005 LW3
  • 2023
  • Ingår i: The Planetary Science Journal. - : Institute of Physics (IOP). - 2632-3338. ; 4:11
  • Tidskriftsartikel (refereegranskat)abstract
    • The Earth close approach of near-Earth asteroid 2005 LW3 on 2022 November 23 represented a good opportunity for a second observing campaign to test the timing accuracy of astrometric observation. With 82 participating stations, the International Asteroid Warning Network collected 1046 observations of 2005 LW3 around the time of the close approach. Compared to the previous timing campaign targeting 2019 XS, some individual observers were able to significantly improve the accuracy of their reported observation times. In particular, U.S. surveys achieved good timing performance. However, no broad, systematic improvement was achieved compared to the previous campaign, with an overall negative bias persisting among the different observers. The calibration of observing times and the mitigation of timing errors should be important future considerations for observers and orbit computers, respectively.
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2.
  • Lambert, Julien, et al. (författare)
  • Numerical radiative transfer with state-of-the-art iterative methods made easy
  • 2016
  • Ingår i: European Journal of Physics. - : IOP Publishing. - 1361-6404 .- 0143-0807. ; 37:1
  • Tidskriftsartikel (refereegranskat)abstract
    • This article presents an on-line tool and its accompanying software resources for the numerical solution of basic radiation transfer out of local thermodynamic equilibrium (LTE). State-of-the-art stationary iterative methods such as Accelerated Lambda-iteration and Gauss-Seidel schemes, using a short characteristics-based formal solver are used. We also comment on typical numerical experiments associated to the basic non-LTE radiation problem. These resources are intended for the largest use and benefit, in support to more classical radiation transfer lectures usually given at the Master level.
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3.
  • Sordo, Rosanna, et al. (författare)
  • Synthetic stellar and SSP libraries as templates for Gaia simulations
  • 2010
  • Ingår i: Astrophysics and Space Science. - : Springer Science and Business Media LLC. - 0004-640X .- 1572-946X. ; 328:1-2, s. 331-335
  • Tidskriftsartikel (refereegranskat)abstract
    • ESA's Gaia mission will collect low resolution spectroscopy in the optical range for 109 objects. Complete and up-to-date libraries of synthetic stellar spectra are needed to built algorithms aimed to automatically derive the classification and the parametrization of this huge amount of data. In addition, libraries of stellar spectra are one of the main ingredients of stellar population synthesis models, aiming to derive the properties of unresolved stellar populations from their integrated light. We present (a) the newly computed libraries of synthetic spectra built by the Gaia community, covering the whole optical range (300-1100 nm) at medium-high resolution of (0.3 nm) for stars spanning the most different types, from M to O, from A-peculiar to Emission lines to White Dwarfs, and (b) the implementation of those libraries in our SSP code (Tantalo in The Initial Mass Function 50 Years Later, 327:235 2005), exploring different stellar evolution models.
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  • Resultat 1-3 av 3

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