Taxonomy and Light-curve Data of 1000 Serendipitously Observed Main-belt Asteroids

N. Erasmus, A. McNeill, M. Mommert, David E Trilling, A. A. Sickafoose, C. Van Gend

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present VRI spectrophotometry of 1003 main-belt asteroids (MBAs) observed with the Sutherland, South Africa node of the Korea Microlensing Telescope Network (KMTNet). All of the observed MBAs were serendipitously captured in KMTNet's large 2° ×2° field of view during a separate targeted near-Earth Asteroid study. Our broadband spectrophotometry is reliable enough to distinguish among four asteroid taxonomies and we confidently categorize 836 of the 1003 observed targets as either a S-, C-, X-, or D-type asteroid by means of a machine learning algorithm approach. Our data show that the ratio between S-type MBAs and (C+X+D)-type MBAs, with H magnitudes between 12 and 18 (12 km ≳diameter ≳0.75 km), is almost exactly 1:1. Additionally, we report 0.5-3 hr (median: 1.3 hr) light-curve data for each MBA and we resolve the complete rotation periods and amplitudes for 59 targets. Of the 59 targets, 2 have rotation periods potentially below the theoretical zero-cohesion boundary limit of 2.2 hr. We report lower limits for the rotation periods and amplitudes for the remaining targets. Using the resolved and unresolved light curves we determine the shape distribution for this population using a Monte Carlo simulation. Our model suggests a population with an average elongation b/a = 0.74 0.07 and also shows that this is independent of asteroid size and taxonomy.

Original languageEnglish (US)
Article number19
JournalAstrophysical Journal, Supplement Series
Volume237
Issue number1
DOIs
StatePublished - Jul 1 2018

Fingerprint

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

Keywords

  • individual (Main-Belt Asteroids)
  • minor planets, asteroids
  • photometric
  • surveys
  • techniques

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Taxonomy and Light-curve Data of 1000 Serendipitously Observed Main-belt Asteroids. / Erasmus, N.; McNeill, A.; Mommert, M.; Trilling, David E; Sickafoose, A. A.; Gend, C. Van.

In: Astrophysical Journal, Supplement Series, Vol. 237, No. 1, 19, 01.07.2018.

Research output: Contribution to journalArticle

Erasmus, N. ; McNeill, A. ; Mommert, M. ; Trilling, David E ; Sickafoose, A. A. ; Gend, C. Van. / Taxonomy and Light-curve Data of 1000 Serendipitously Observed Main-belt Asteroids. In: Astrophysical Journal, Supplement Series. 2018 ; Vol. 237, No. 1.
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