Main-belt asteroids with WISE/NEOWISE: Near-infrared albedos

Joseph R. Masiero, T. Grav, A. K. Mainzer, C. R. Nugent, J. M. Bauer, R. Stevenson, S. Sonnett

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


We present revised near-infrared albedo fits of 2835 main-belt asteroids observed by WISE/NEOWISE over the course of its fully cryogenic survey in 2010. These fits are derived from reflected-light near-infrared images taken simultaneously with thermal emission measurements, allowing for more accurate measurements of the near-infrared albedos than is possible for visible albedo measurements. Because our sample requires reflected light measurements, it undersamples small, low-albedo asteroids, as well as those with blue spectral slopes across the wavelengths investigated. We find that the main belt separates into three distinct groups of 6%, 16%, and 40% reflectance at 3.4 μm. Conversely, the 4.6 μm albedo distribution spans the full range of possible values with no clear grouping. Asteroid families show a narrow distribution of 3.4 μm albedos within each family that map to one of the three observed groupings, with the (221) Eos family being the sole family associated with the 16% reflectance 3.4 μm albedo group. We show that near-infrared albedos derived from simultaneous thermal emission and reflected light measurements are important indicators of asteroid taxonomy and can identify interesting targets for spectroscopic follow-up.

Original languageEnglish (US)
Article number121
JournalAstrophysical Journal
Issue number2
StatePublished - Aug 20 2014
Externally publishedYes


  • asteroids: general
  • minor planets

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Main-belt asteroids with WISE/NEOWISE: Near-infrared albedos'. Together they form a unique fingerprint.

Cite this