Wisseed Sat is a nanosatellite owned by Wisseed-the terra and built by Task and MASUYAMA-MFG. A satellite for education purposes, Wisseed Sat carries the milk teeth of around a dozen children, following the Japanese tradition of throwing one's milk tooth up towards the roof after they have come off to wish for the growth of the new tooth. ^[1] Wisseed Sat is planned to be launched by a SpaceX Falcon 9 rocket and will be carried to the International Space Station (ISS) on board the Cygnus NG-21 spacecraft. ^[2] Wisseed Sat will be deployed from the ISS on a later date. ^[1]

Wisseed Sat was developed by Task and MASUYAMA-MFG. Task is a newspace company founded by Daisuke Furutomo, an engineer who was a member of team Hakuto which competed in the Google Lunar X Prize. ^[3] MASUYAMA-MFG is a company based in Tottori Prefecture and was in charge of manufacturing the spacecraft parts. ^[1] The The spacecraft is a 10 cm size cube, or a 1U size CubeSat, and wighs less than 1.1kg. ^[2] After completion, Wisseed Sat was passed on to the Japanese space agency JAXA on 19 April 2024 to be launched by SpaceX. ^{[4] [1]}

Wisseed Sat carries the milk teeth of around a dozen children to space. In Japan, there is a custom for children to throw their own milk tooth up torwards the roof after they have fallen off, to wish for a healthy new tooth to grow. ^[1] Wisseed Sat is inspired by that tradition and will fly the teeth all the way to space, to wish that the children will accomplish big things once they have grown up. The satellite is part of Wisseed academy, an education program run by Wisseed-the terra. Wisseed-the terra is an education company based in Tokyo. According to Wisseed-the terra, 'Wisseed' is a portmanteau of wisdom and seed. ^[4]

• Space experience (in Japanese)

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