[P-PS03] 太陽系小天体：太陽系の形成と進化における最新成果と今後の展望

[PPS03-P12] A deep analysis for New Horizons’ TNO search images

*吉田 二美^1,2、柳沢 俊史³、伊藤 孝士^4,2、黒崎 裕久³、吉川 真³、神谷 浩紀³、Jiang Ji-an ^5,4、Stern Alan⁶ (1.産業医科大学、2.千葉工業大学、3.宇宙航空研究開発機構、4.国立天文台、5.中国科学技術大学、6.Southwest Research Institute)

キーワード：太陽系外縁天体、地上観測、惑星探査

Observation data sets acquired by the Hyper Suprime-Cam (HSC) on the Subaru Telescope for the New Horizons mission target search were analyzed using JAXA's FPGA-based Moving Object Detection System. This JAXA's detection system has been used to detect fast-moving objects, such as space debris and near-Earth asteroids, in an ideal image set observed at precise and regular time intervals. In this study, we had adjust the system to detect slow-moving objects, such as trans-Neptunian objects (TNOs) in datasets, such as the Subaru Telescope images that are not intended to be acquired at precisely timed intervals. The New Horizons target search observations took continuous images of one field of view of the HSC for half a night. This cadence of observations makes it easy to match the observation dataset with JAXA's moving object detection system. Observations for the New Horizons mission began in May 2020 and are still ongoing, but here we have used the dataset observed between May 2020 and June 2021, which has passed the proprietary period and is already available to the public. This analysis was carried out in a completely different way to that of the New Horizons mission science team did (Fraser et al. 2024 in preparation). We detected 84 TNO candidates in the June 2020 and June 2021 datasets, when the observation field was close to the opposition. Two of these were newly discovered objects in this study, additional discoveries from Fraser et al. (2024).
This poster mainly describes the analysis methods.