  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.

Earth and Planetary Astrophysics