Characterization of Near-Earth Asteroids Using KMTNET-SAAO

N. Erasmus, M. Mommert, David E Trilling, A. A. Sickafoose, C. Van Gend, J. L. Hora

Research output: Contribution to journalArticle

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Abstract

We present here VRI spectrophotometry of 39 near-Earth asteroids (NEAs) observed with the Sutherland, South Africa, node of the Korea Microlensing Telescope Network (KMTNet). Of the 39 NEAs, 19 were targeted, but because of KMTNet's large 2° ×2° field of view, 20 serendipitous NEAs were also captured in the observing fields. Targeted observations were performed within 44 days (median: 16 days, min: 4 days) of each NEA's discovery date. Our broadband spectrophotometry is reliable enough to distinguish among four asteroid taxonomies and we were able to confidently categorize 31 of the 39 observed targets as either an S-, C-, X-, or D-type asteroid by means of a Machine Learning algorithm approach. Our data suggest that the ratio between "stony" S-type NEAs and "not-stony" (C+X+D)-type NEAs, with H magnitudes between 15 and 25, is roughly 1:1. Additionally, we report ∼1 hr light curve data for each NEA, and of the 39 targets, we were able to resolve the complete rotation period and amplitude for six targets and report lower limits for the remaining targets.

Original languageEnglish (US)
Article number162
JournalAstronomical Journal
Volume154
Issue number4
DOIs
StatePublished - Oct 1 2017

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asteroids
asteroid
spectrophotometry
taxonomy
machine learning
Republic of South Africa
Korea
field of view
light curve
telescopes
broadband

Keywords

  • minor planets, asteroids: individual (near-Earth objects)
  • surveys
  • techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Erasmus, N., Mommert, M., Trilling, D. E., Sickafoose, A. A., Van Gend, C., & Hora, J. L. (2017). Characterization of Near-Earth Asteroids Using KMTNET-SAAO. Astronomical Journal, 154(4), [162]. https://doi.org/10.3847/1538-3881/aa88be

Characterization of Near-Earth Asteroids Using KMTNET-SAAO. / Erasmus, N.; Mommert, M.; Trilling, David E; Sickafoose, A. A.; Van Gend, C.; Hora, J. L.

In: Astronomical Journal, Vol. 154, No. 4, 162, 01.10.2017.

Research output: Contribution to journalArticle

Erasmus, N, Mommert, M, Trilling, DE, Sickafoose, AA, Van Gend, C & Hora, JL 2017, 'Characterization of Near-Earth Asteroids Using KMTNET-SAAO', Astronomical Journal, vol. 154, no. 4, 162. https://doi.org/10.3847/1538-3881/aa88be
Erasmus, N. ; Mommert, M. ; Trilling, David E ; Sickafoose, A. A. ; Van Gend, C. ; Hora, J. L. / Characterization of Near-Earth Asteroids Using KMTNET-SAAO. In: Astronomical Journal. 2017 ; Vol. 154, No. 4.
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