Observational Completion Limit of Minor Planets from the Asteroid Belt to Jupiter Trojans
Abstract
With the growing numbers of asteroids being discovered, identifying an observationally complete sample is essential for statistical analyses and for informing theoretical models of the dynamical evolution of the solar system. We present an easily implemented method of estimating the empirical observational completeness in absolute magnitude, ${H}_{\mathrm{lim}}$, as a function of semimajor axis. Our method requires fewer assumptions and decisions to be made in its application, making results more transportable and reproducible among studies that implement it, as well as scalable to much larger data sets of asteroids expected in the next decade with the Vera C. Rubin Observatory's Legacy Survey of Space and Time. Using the values of ${H}_{\mathrm{lim}}$ (a) determined at high resolution in semimajor axis, a, we demonstrate that the observationally complete sample size of the main belt asteroids is larger by more than a factor of 2 compared with using a conservative single value of ${H}_{\mathrm{lim}}$, an approach often adopted in previous studies. Additionally, by fitting a simple, physically motivated model of ${H}_{\mathrm{lim}}$ (a) to ∼7 × 10^{5} objects in the Minor Planet Database, our model reveals statistically significant deviations between the main belt and the asteroid populations beyond the main belt (Hungarias, Hildas, and Trojans), suggesting potential demographic differences, such as in their size, eccentricity, or inclination distributions.
 Publication:

The Planetary Science Journal
 Pub Date:
 December 2020
 DOI:
 10.3847/PSJ/abbe25
 arXiv:
 arXiv:2010.07822
 Bibcode:
 2020PSJ.....1...75H
 Keywords:

 Astronomical methods;
 Main belt asteroids;
 Asteroid belt;
 Asteroids;
 Small solar system bodies;
 Solar system;
 Astronomy data analysis;
 1043;
 2036;
 70;
 72;
 1469;
 1528;
 1858;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 AAS PSJ accepted, 8 pages, 4 figures, 68k compatible