11:15 AM - 11:30 AM
[PPS05-09] The lunar impact flash observations among two nations and application of the results to future lunar seismic experiments
Keywords:Lunar impact flash, Ground observation, Impact seismic events, Lunar seismic experiment
On the other hand, previous lunar impact flash observations have been performed separately at each ground station, and each observation of the Moon is limited in both time and space. In addition, ground observation can be prevented due to cloud weather. Therefore, we have planned lunar impact flash observations among two nations; Japan and France during same term. The observations at two separate stations in longitudinal direction can enlarge time and area of the flash monitoring. In this plan, we prepared some ground station in each country to ensure detection of the impact flashes and acquire redundancy against weather. We have a plan to improve the detection efficiency of the lunar impact flash and knowledge about the frequent distribution of meteoroid impacts by comparison and integration of the observational results in the two countries. Then, we will evaluate the expected number of impact seismic events detected in future seismic experiments using the new ground observational results, and study how accurate we can determine the lunar interior structure by the new travel time data.
Currently, in Japanese side, 4 ground stations have been constructed at the University of Electro-Communications, Nihon University, ISAS and NAOJ-Mizusawa-observatory. We observe the Moon during lunar phases between crescent and half moons at every month using various telescopes at visible, near-infrared and thermal infrared wavelengths. We could detect lunar impact flashes simultaneously at 3 ground stations during Geminids in December 2017. In this presentation, we will report current observational and analysis results from our observations and discuss application of the results to future lunar seismic experiments.