[U-06_28AM2] New Progress toward the Understanding of Small Solar System Bodies

[U06-09] The final impact tests of Small Carry-on Impactor(SCI) equipped on HAYABUSA-2

*Masahiko HAYAKAWA¹, Takanao SAIKI¹, Hiroshi IMAMURA², Kei SHIRAI², Koji WADA³, Masahiko ARAKAWA⁴, Chisato OKAMOTO², Yuichi TSUDA¹, Yasuhiko TAKAGI⁵, Toshihiko KADONO⁶, Satoru NAKAZAWA², Yuichi IIJIMA¹, Hajime YANO², Hideo KAMITOMAI⁷, Shinichi MATSUZAKI⁷ (1.ISAS/JAXA, 2.JSPEC/JAXA, 3.Planetary Exploration Research Center/Chiba Institute of Technology, 4.Graduate School of Science, Kobe University, 5.Aichi Toho University, 6.University of Occupational and Environmental Health, 7.NIPPONN KOHKI Co. ltd)

Keywords:HAYABUSA-2, Small Carry-on Impactor, impact experiment, crater, explosion

HAYABUSA-2(the next Japanese Aseroid Sumple Return Explorer) is now at the final integrated test. Before this test, all sub-systems experienced final test individually. The Small Carry-on Impactor:SCI has been adopted the new sub-system of HAYABUSA-2, it is one of the self forging fragment which will be able to eject the 2kg projectile by 2km/sec velocity by detonation. In this paper we show the outline and results of the final performance test of the SCI explosive part on Oct. 2013. The test bodies have be made by the same rot of flight model, and experienced environmental stress tests. The projectiles formed explosion impacted on the sand target and made craters. A point of view of understunding of impact phenomina, these tests are larger scale impact experiments than thats made in labolatory, between space scale and labolatory scale. Therefore we observed and measured the crater formation prosesses by two high-speed video cameras, a infrared video camera, accelerometers, geophons, and digital handy video cameras. We succeeded to obtaine five cratering prosesses.