Wise/neowise observations of the Hilda population: Preliminary results

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

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


We present the preliminary analysis of 1023 known asteroids in the Hilda region of the solar system observed by the NEOWISE component of the Wide-field Infrared Survey Explorer (WISE). The sizes of the Hildas observed range from 3 to 200km. We find no size-albedo dependency as reported by other projects. The albedos of our sample are low, with a weighted mean value of pV = 0.055 0.018, for all sizes sampled by the NEOWISE survey. We observed a significant fraction of the objects in the two known collisional families in the Hilda population. It is found that the Hilda collisional family is brighter, with a weighted mean albedo of pV = 0.061 0.011, than the general population and dominated by D-type asteroids, while the Schubart collisional family is darker, with a weighted mean albedo of pV = 0.039 0.013. Using the reflected sunlight in the two shortest WISE bandpasses, we are able to derive a method for taxonomic classification of 10% of the Hildas detected in the NEOWISE survey. For the Hildas with diameter larger than 30km, there are 67+7 - 15% D-type asteroids and 26+17 - 5% C-/P-type asteroids (with the majority of these being P-types).

Original languageEnglish (US)
Article number197
JournalAstrophysical Journal
Issue number2
StatePublished - Jan 10 2012


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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