|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Spectral properties and geology of bright and dark materials on dwarf planet Ceres | | G. Thangjam
; A. Nathues
; T. Platz
; M. Hoffmann
; E. A. Cloutis
; K. Mengel
; M. R. M. Izawa
; D. M. Applin
; | | Date: |
14 Dec 2017 | | Abstract: | Variations and spatial distributions of bright and dark material on dwarf
planet Ceres play a key role for the understanding of the processes that have
led to its present surface composition. We define limits for bright and dark
material in order to distinguish them consistently, based on the reflectance
with respect to the average surface using Dawn Framing Camera data. A
systematic classification of four types of bright material is presented based
on their spectral properties, composition, spatial distribution, and
association with specific geomorphological features. We found obvious
correlations of reflectance with spectral shape (slopes) and age; however, this
is not unique throughout the bright spots. Although impact features show
generally more extreme reflectance variations, several areas can only be
understood in terms of inhomogeneous distribution of composition as inferred
from Dawn Visible and Infrared Spectrometer data. Additional materials with
anomalous composition and spectral properties are rare. The identification of
the origin of the dark, and particularly the darkest, material remains to be
explored. The spectral properties and the morphology of the dark sites suggest
an endogenic origin, but it is not clear whether they are more or less
primitive surficial exposures or excavated sub-surface but localized material.
The reflectance, spectral properties, inferred composition, and geologic
context collectively suggest that the bright and dark materials tend to
gradually change towards the average surface over time. This could be because
of multiple processes, i.e., impact gardening/space weathering, and lateral
mixing, including thermal and aqueous alteration, accompanied with changes in
composition and physical properties such as grain size, surface temperature,
porosity (compaction). | | Source: | arXiv, 1712.5203 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER