Nature of bright C-complex asteroids
arXiv:2012.07141 · doi:10.1093/pasj/psaa118
Abstract
Most C-complex asteroids have albedo values less than 0.1, but there are some high-albedo (bright) C-complex asteroids with albedo values exceeding 0.1. To reveal the nature and origin of bright C-complex asteroids, we conducted spectroscopic observations of the asteroids in visible and near-infrared wavelength regions. As a result, the bright B-, C-, and Ch-type (Bus) asteroids, which are subclasses of the Bus C-complex, are classified as DeMeo C-type asteroids with concave curvature, B-, Xn-, and K-type asteroids. Analogue meteorites and material (CV/CK chondrites, enstatite chondrites/achondrites, and salts) associated with these spectral types of asteroids are thought to be composed of minerals and material exposed to high temperatures. A comparison of the results obtained in this study with the SDSS photometric data suggests that salts may have occurred in the parent bodies of 24 Themis and 10 Hygiea, as well as 2 Pallas. The bright C-complex asteroids in other C-complex families were likely caused by impact heating. Bright C-complex asteroids that do not belong to any families are likely to be impact metamorphosed carbonaceous chondrites, CV/CK chondrites, or enstatite chondrites/achondrites.
arXiv comment20 pages, 5 figures, and 6 table, accepted for publication in PASJ
References in corpus (33)
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- The Infrared Astronomical Mission AKARI
- Main Belt Asteroids with WISE/NEOWISE I: Preliminary Albedos and Diameters
- NEOWISE Observations of Near-Earth Objects: Preliminary Results
- Compositional distributions and evolutionary processes for the near-Earth object population: Results from the MIT-Hawaii Near-Earth Object Spectroscopic Survey (MITHNEOS
- Ammonium salts are a reservoir of nitrogen on a cometary nucleus and possibly on some asteroids
- NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
- WISE/NEOWISE Observations of the Jovian Trojans: Preliminary Results
- Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-Cryogenic Observations of Main Belt Asteroids
- Main Belt Asteroids with WISE/NEOWISE: Near-Infrared Albedos
- Aqueous alteration on main belt primitive asteroids: results from visible spectroscopy
- The Distribution of Basaltic Asteroids in the Main Belt
- Albedo Properties of Main Belt Asteroids Based on the Infrared All-Sky Survey of the Astronomical Satellite AKARI
- WISE/NEOWISE Observations of the Hilda Population: Preliminary Results
- AKARI/IRC Near-Infrared Asteroid Spectroscopic Survey: AcuA-spec
- V-type asteroids in the middle Main Belt
- Near-infrared colors of minor planets recovered from VISTA - VHS survey (MOVIS)
- The Composition of M-type asteroids II: Synthesis of spectroscopic and radar observations
- Effects of friction and plastic deformation in shock-comminuted damaged rocks on impact heating
- Mars Encounters cause fresh surfaces on some near-Earth asteroids
- Asteroid Family Associations of Active Asteroids
- NEOWISE Studies of Asteroids with Sloan Photometry: Preliminary Results
- Thermophysical modeling of NEOWISE observations of DESTINY+ targets Phaethon and 2005 UD
- Compositional characterisation of the Themis family
- A Spectroscopically Unique Main Belt Asteroid: 10537 (1991 RY16)
- A dark asteroid family in the Phocaea region
- Are Large Trojan Asteroids Salty? An Observational, Theoretical, and Experimental Study
- Q-type asteroids: Possibility of non-fresh weathered surfaces
- The Asteroid Catalog Using AKARI IRC Slow-Scan Observations
- Physical properties of near-Earth asteroids with a low delta-: Survey of target candidates for the Hayabusa2 mission
- The Opposition Effect of the Asteroid 4 Vesta
- Follow-up observations for the Asteroid Catalog using AKARI Spectroscopic Observations
- Optical spectroscopy and photometry of main-belt asteroids with a high orbital inclination