Characterization of Near-Earth Asteroids Using KMTNET-SAAO
| Autor: | David E. Trilling, Joseph L. Hora, Michael Mommert, N. Erasmus, Amanda A. Sickafoose, C. van Gend |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics Rotation period Near-Earth object 010504 meteorology & atmospheric sciences FOS: Physical sciences Astronomy Astronomy and Astrophysics Light curve Gravitational microlensing 01 natural sciences law.invention Telescope Space and Planetary Science Asteroid law 0103 physical sciences 010303 astronomy & astrophysics Astrophysics - Earth and Planetary Astrophysics 0105 earth and related environmental sciences |
| Zdroj: | The Astronomical Journal. 154:162 |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/aa88be |
| Popis: | 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 deg by 2 deg 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 a S-, C-, X- or D-type asteroid by means of a Machine Learning (ML) 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-hour 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. |
| Databáze: | OpenAIRE |
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