The Distribution of Highly Red-sloped Asteroids in the Middle and Outer Main Belt
arXiv:2403.18553 · doi:10.3847/PSJ/ad2e99
Abstract
Red (S > 10%/0.1 micron) spectral slopes are common among Centaurs and trans-Neptunian objects (TNOs) in the outer solar system. Interior to and co-orbital with Jupiter, the red (S approx. = 10%/0.1 micron) slopes of D-type main-belt and Jupiter Trojan asteroids are thought to reflect their hypothesized shared origin with TNOs beyond the orbit of Jupiter. In order to quantify the abundance of red-sloped asteroids within the main belt, we conducted a survey using the NASA Infrared Telescope Facility and the Lowell Discovery Telescope. We followed up on 32 candidate red objects identified via spectrophotometry from the Sloan Digital Sky Survey's Moving Object Catalog to confirm their steep spectral slopes and determine their taxonomic classifications. We find that our criteria for identifying candidate red objects from the Moving Object Catalog result in an approx. 50% confirmation rate for steeply red-sloped asteroids. We also compare our observations of main-belt asteroids to existing literature spectra of the Jupiter Trojans and steeply red-sloped main-belt asteroids. We show that some red-sloped asteroids have linearly increasing reflectance with increasing wavelength, while other red-sloped asteroids show a flattening in slope at longer near-infrared wavelengths, indicating a diversity among the population of spectrally red main-belt asteroids suggestive of a variety of origins among the population of steep-sloped asteroids.
arXiv comment23 pages, 8 figures, draft version accepted to PSJ
References in corpus (21)
- The SIMBAD astronomical database
- Solar System evolution from compositional mapping of the asteroid belt
- Solar System Objects Observed in the SDSS Commissioning Data
- The taxonomic distribution of asteroids from multi-filter all-sky photometric surveys
- Capture of Trojans by Jumping Jupiter
- Near-Infrared Spectroscopy of Trojan Asteroids: Evidence for Two Compositional Groups
- Asteroid Taxonomy from Cluster Analysis of Spectrometry and Albedo
- A hypothesis for the color diversity of the Kuiper belt
- Colors and taxonomy of Centaurs and Trans-Neptunian Objects
- Colours of minor bodies in the outer solar system - II: A statistical analysis revisited
- A hypothesis for the color bimodality of Jupiter Trojans
- First results from the MIT Optical Rapid Imaging System (MORIS) on the IRTF: a stellar occultation by Pluto and a transit by exoplanet XO-2b
- The Colors of Extreme Outer Solar System Objects
- The consequences of planetary migration on the minor bodies of the early Solar System
- Unexpected D-type Interlopers in the Inner Main Belt
- The differing magnitude distributions of the two Jupiter Trojan color populations
- Twenty years of SpeX: Accuracy limits of spectral slope measurements in asteroid spectroscopy
- The infrared colors of the Sun
- Asteroids Observed by The Sloan Digital Sky Survey
- Discovery of two TNO-like bodies in the asteroid belt
- Visible Analysis of NASA Lucy Mission Targets Eurybates, Polymele, Orus and Donaldjohanson