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High-resolution observations of bright boulders on asteroid Ryugu: 2. Spectral properties
- Source :
- Icarus, Icarus, Elsevier, 2021, 369, pp.114591. ⟨10.1016/j.icarus.2021.114591⟩
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
Abstract
- Many small boulders with reflectance values higher than 1.5 times the average reflectance have been found on the near-Earth asteroid 162173 Ryugu. Based on their visible wavelength spectral differences, Tatsumi et al. (2021) defined two bright boulder classes: C-type and S-type. These two classifications of bright boulders have different size distributions and spectral trends. In this study, we measured the spectra of 79 bright boulders and investigated their detailed spectral properties. Analyses obtained a number of important results. First, S-type bright boulders on Ryugu have spectra that are similar to those found for two different ordinary chondrites with different initial spectra that have been experimentally space weathered the same way. This suggests that there may be two populations of S-type bright boulders on Ryugu, perhaps originating from two different impactors that hit its parent body. Second, the model space-weathering ages of meter-size S-type bright boulders, based on spectral change rates derived in previous experimentally irradiated ordinary chondrites, are 0.1-1 Myr, which is consistent with the crater retention age (<br />Comment: 21 pages, 20 Figures, 1 Table, Published in Icarus, November 15 2021, 369 114591
- Subjects :
- Earth and Planetary Astrophysics (astro-ph.EP)
Radiogenic nuclide
010504 meteorology & atmospheric sciences
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Spectral properties
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
01 natural sciences
Parent body
Spectral line
Impact crater
Space and Planetary Science
Asteroid
Chondrite
[SDU]Sciences of the Universe [physics]
0103 physical sciences
Spectroscopy
010303 astronomy & astrophysics
Geology
0105 earth and related environmental sciences
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00191035 and 10902643
- Database :
- OpenAIRE
- Journal :
- Icarus, Icarus, Elsevier, 2021, 369, pp.114591. ⟨10.1016/j.icarus.2021.114591⟩
- Accession number :
- edsair.doi.dedup.....e4a7a1706b468ac915244c198aea88ad