منابع مشابه
Crater Counting on Asteroid 25143
1 , R. Nakamura 2 , M. Ishiguro, J. Saito, T. Hashimoto, T. Kubota, A. M. Nakamura, N. Hirata, K. Hiraoka, H. Demura, T. Michikami 6 , 1 Institute of Space and Astronautical Sciences, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan ([email protected]), 2 National Institute of Advanced Science and Technology, 3 Seoul University, 4 Kobe Un...
متن کاملComparison of Different Crater Counting Methods Applicated to Parana
Introduction: Martian valley networks are good indicators of the past climate. These features are located primarily in heavily cratered terrain of Noachian age (>3.7 Ga) [1] but the exact timing of these features is not well understood. Recent global studies using superposed craters along different fluvial valleys [2, 3] determined that most formed during the Late Noachian to Early Hesperian. H...
متن کاملThe timing of martian valley network activity: Constraints from buffered crater counting
Valley networks, concentrations of dendritic channels that often suggest widespread pluvial and fluvial activity, have been cited as indicators that the climate of Mars differed significantly in the past from the present hyperarid cold desert conditions. Some researchers suggest that the change in climate was abrupt, while others favor a much more gradual transition. Thus, the precise timing of...
متن کاملUnderstanding and Reducing Crater Counting Errors in Citizen Science Data and the Need for Standardisation
Citizen science has become a popular tool for preliminary data processing tasks, such as identifying and counting Lunar impact craters in modern high-resolution imagery. However, use of such data requires that citizen science products are understandable and reliable. Contamination and missing data can reduce the usefulness of datasets so it is important that such effects are quantified. This pa...
متن کاملAlamo Impact Crater Documented
Introduction: The early Late Devonian, wet-target Alamo Event at southern Nevada resulted in one of the best-exposed and well-dated impact deposits ever documented, the Alamo Breccia [1]. Because post-impact geologic processes have modified, obscured [2, 3] and perhaps wiped away its original morphological and architectural relationships, the crater stratigraphy has remained uncertain. Thus, th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy and Geophysics
سال: 2003
ISSN: 1366-8781,1468-4004
DOI: 10.1046/j.1468-4004.2003.44421.x