WISE/NEOWISE observations of the Jovian Trojans: Preliminary results

T. Grav, A. K. Mainzer, J. Bauer, J. Masiero, T. Spahr, R. S. McMillan, R. Walker, R. Cutri, E. Wright, P. R.M. Eisenhardt, E. Blauvelt, E. Debaun, D. Elsbury, T. Gautier, S. Gomillion, E. Hand, A. Wilkins

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

We present the preliminary analysis of over 1739 known and 349 candidate Jovian Trojans observed by the NEOWISE component of the Wide-field Infrared Survey Explorer (WISE). With this survey the available diameters, albedos, and beaming parameters for the Jovian Trojans have been increased by more than an order of magnitude compared to previous surveys. We find that the Jovian Trojan population is very homogenous for sizes larger than ∼10km (close to the detection limit of WISE for these objects). The observed sample consists almost exclusively of low albedo objects, having a mean albedo value of 0.07 ± 0.03. The beaming parameter was also derived for a large fraction of the observed sample, and it is also very homogenous with an observed mean value of 0.88 ± 0.13. Preliminary debiasing of the survey shows that our observed sample is consistent with the leading cloud containing more objects than the trailing cloud. We estimate the fraction to be N(leading)/N(trailing) ∼1.4 ± 0.2, lower than the 1.6 ± 0.1 value derived by Szabó et al.

Original languageEnglish (US)
Article number40
JournalAstrophysical Journal
Volume742
Issue number1
DOIs
StatePublished - Nov 20 2011
Externally publishedYes

Keywords

  • infrared: planetary systems
  • minor planets, asteroids: general
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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