A meteoroid is
From trajectory data alone, we found a bulk density of 3.5 g/cm3 to be the most likely value for the Pyrenean meteoroid. We present the multi-instrument detected 22 December 2018 fireball over Western Pyrenees, and compare several techniques aiming to obtain a reliable method to be used when measuring impacts of similar scale. The increase in detector sensitivity and availability in the past three decades has allowed us to derive knowledge of the meteoroid flux and impact energy into the Earth’s atmosphere. The significant difference between the modeled impact of a real shape body and its real place of finding compared to a spherically symmetric body indicates the importance of the method used. Also, an important result is a difference in the impact area of the real body with a specific orientation without rotation and the body with considered rotation. Simulation showed significant differences in trajectory and the impact area for the different real body orientations compared to the spherically symmetric body. Comparison of the results for real and spherical model meteorite impact location is discussed. Using these parameters we get the more realistic body trajectory and the impact area coordinates. The final outputs from these programs are the drag coefficient as a function of the altitude and the particle orientation.
A METEOROID IS SOFTWARE
The simulation is performed using virtual wind tunnel in the MicroCFD (Computational Fluid Dynamics) software to obtain more realistic drag coefficients and using the µ(m)-Trajectory software to model the particle trajectory in the atmosphere including the wind profile.
Using a 3D model of fragments, we consider the real shape of the body to define its resistance properties during atmospheric transition more specifically. In the simulation, we use 3D models of fragments of the Košice meteorite with different sizes and shapes. Our goal is to model the interaction of real shape meteoroids with Earth’s atmosphere and compare the results with the standard spherical body approach. One of the important factors that affect the movement of a body in the atmosphere is its shape and orientation. The complex dynamics of bodies, originating from the interplanetary matter and passing through Earth’s atmosphere, defines their further position, velocity, and final location on Earth’s surface in the form of meteorites. However, the occurrence ratio of meteoroid fragmentation in our experiment is approximately 6%, which is considerably lower than that observed in previous studies, which needs further investigation.Īims. It demonstrates that potential direct observation of meteoroid fragmentation could be observed by a relatively small aperture and power using pulse compression processing. We have observed 2 potential direct meteoroid fragmentation cases of all 55 meteor events. Among these events, 34 cases were head echoes, 18 cases were specular trail echoes, and 3 cases were head echo and nonspecular trail echo concurrent events. During a continuous observation interval of 16 h, 55 meteor echo events were found. Based on SYISR-8, we configured the system to detect the meteor echo with high range resolution. In the development of Sanya Incoherent Scatter Radar (SYISR), which is a major scientific instrument project founded by the National Natural Science Foundation of China (NSFC), we established a prototype system of 8 subarrays (named SYISR-8 hereafter), including 256 transceiver modules totally, beginning in July 2018 to verify the functions of the radar. This marks the fifth fall recovered in Australia by the Desert Fireball Network, and the smallest meteoroid ($\simeq 2$ kg) to ever survive entry and be recovered as a meteorite. The meteorite, Arpu Kuilpu, has been classified as an H5 ordinary chondrite. Based on measurements of short-lived radionuclides, the fragment was confirmed to be a fresh fall. One 42 g fragment was recovered within the predicted fall area based on the dark flight model. A search campaign was conducted with several Desert Fireball Network team members and other volunteers. A light curve was also extracted and showed that the body experienced very little fragmentation during its atmospheric passage. This trajectory's backward numerical integrations indicate that the object originated from the outer main belt with a semi-major axis of 2.75 au. One station was nearly directly underneath the trajectory, greatly constraining the trajectory solution. The event was observed by six fireball observatories, and lasted for five seconds.
On 1 June 2019, just before 7:30 PM local time, the Desert Fireball Network detected a -9.3 magnitude fireball over South Australia near the Western Australia border.