WISE/NEOWISE observations of Hilda asteroids

DOI

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 p_V_=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 p_V_=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 p_V_=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).

Identifier
DOI http://doi.org/10.26093/cds/vizier.17440197
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/744/197
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/744/197
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/744/197
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/744/197
Provenance
Creator Grav T.; Mainzer A.K.; Bauer J.; Masiero J.; Spahr T.; McMillan R.S.,Walker R.; Cutri R.; Wright E.; Eisenhardt P.R.; Blauvelt E.; DeBaun E.,Elsbury D.; Gautier T.; Gomillion S.; Hand E.; Wilkins A.
Publisher CDS
Publication Year 2013
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Cosmology; Natural Sciences; Observational Astronomy; Physics; Solar System Astronomy