Jan 1, 2011 · Ejecta were collected in bins at various distances from the impact. The observed nearly-90° ejection angle and the fall-distance to the chamber floor were used to calculate the ejection velocity of material in the collection bins. The …

Mar 1, 2022 · The amount by which crater ejecta enhances asteroid deflection—that is, the momentum of the crater ejecta that escapes the gravitational attraction of the target body divided by the impactor momentum (β − 1)—has been found to vary significantly depending on the target asteroid’s properties, composition and structure (e.g., Jutzi and ...

Mar 1, 2019 · As an example, Fig. 3 shows the ejecta velocity histogram with cumulative size distribution for a Cu projectile impacting on a sandstone target. A luminescent transient plasma plume followed by a steepening ejecta cone and completed by the detachment of spall fragments characterizes the typical evolution of ejecta [12]. The high-speed camera ...

The rock avalanche/ ejecta (RAEJ) documented by Crosta et al. (2018a, b) represent peculiar types of landslides that can be found on Mars but are unknown on Earth (Fig. 14). These landslides initially acquired momentum by asteroid impact and started as impact ejecta or as destabilization of slope masses directly neighboring the impact crater ...

Sep 1, 2024 · Impact cratering is an important geological process on Earth. This review summarizes the state of knowledge of the Precambrian (Hadean, Archean, and P…

The size of ejecta that penetrated the foil targets at a velocity lower than the assumed values would have been underestimated, as the ratio of the hole size to ejecta size increases with velocity. Table 2 shows the constant values we determined for Eq. (1) for each ejecta velocity, while Fig. 3 a illustrates the empirical relationship ...

Jan 1, 2018 · The various ejecta facies were then examined in more detail using ∼0.5–1 m per pixel LROC Narrow Angle Camera (NAC) images (Robinson et al., 2010) to better define the facies boundaries and focus in on specific details and areas of interest. The individual images used to observe the morphology of Orientale ejecta were selected based on ...

Apr 1, 2025 · The ejecta size distributions follow a log-normal function near the peak diameter, while obey a power law for large particles. CRediT authorship contribution statement Bao Wu: Writing – review & editing, Writing – original draft, Software, Methodology, Investigation, Data curation, Conceptualization.

May 1, 2014 · Martian impact craters often exhibit unique ejecta morphologies relative to ballistically-dominated ejecta observed in lunar and mercurian impact craters (Carr et al., 1977, Schultz and Gault, 1979): martian lobate ejecta deposits frequently have distinctive ejecta deposit boundaries rather than an ejecta deposit of gradational thickness, and appear to have been …

Nov 1, 2024 · The ejecta distribution satisfies a rotationally symmetric distribution along the Y-axis. The XOZ plane represents the surface position of the target, which is the initial ejection position of the ejecta. The ejecta forms a hollow cone with an angle approaching 140°. From Table 9, The cone angle decreases with increasing impact velocity.