Title: Characterization of Near-Earth Asteroids using KMTNet-SAAO,
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 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.