Binary candidates in the Jovian Trojan and Hilda populations from NEOWISE light curves

S. Sonnett, A. Mainzer, T. Grav, J. Masiero, J. Bauer

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Determining the binary fraction for a population of asteroids, particularly as a function of separation between the two components, helps describe the dynamical environment at the time the binaries formed, which in turn offers constraints on the dynamical evolution of the solar system. We searched the NEOWISE archival data set for close and contact binary Trojans and Hildas via their diagnostically large light curve amplitudes. We present 48 out of 554 Hilda and 34 out of 953 Trojan binary candidates in need of follow-up to confirm their large light curve amplitudes and subsequently constrain the binary orbit and component sizes. From these candidates, we calculate a preliminary estimate of the binary fraction without confirmation or debiasing of 14%-23% for Trojans larger than ∼12 km and 30%-51% for Hildas larger than ∼4 km. Once the binary candidates have been confirmed, it should be possible to infer the underlying, debiased binary fraction through estimation of survey biases.

Original languageEnglish (US)
Article number191
JournalAstrophysical Journal
Issue number2
StatePublished - Feb 1 2015
Externally publishedYes


  • Asteroids: general
  • Minor planets

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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