Hisaki

Decommissioned by deactivation on 8 December 2023.

• Auto — all • Name — Hisaki • Mission Type — Ultraviolet astronomy • Operator — JAXA • Website — http: www.jaxa.jp/projects/sat/sprint_a/ • Cospar Id — 2013-049A • Satcat — 39253 • Mission Duration — ~1 year planned (science phase) (achieved) • Spacecraft Bus — NEXTAR NX-300L • Manufacturer — NEC • Launch Mass — 348 kg • Dimensions — 4 * • Power — 900 watts • Launch Date — 14 September 2013, 05:00 UTC • Launch Rocket — Epsilon • Launch Site — Uchinoura • Disposal Type — Decommissioned • Deactivated — 8 December 2023 • Orbit Epoch — 23 January 2015, 18:21:14 UTC • Orbit Reference — Geocentric • Orbit Regime — Low Earth • Orbit Periapsis — 957.9 km • Orbit Apoapsis — 1161.8 km • Orbit Inclination — 29.72 degrees • Orbit Semimajor — 7431.52 km • Orbit Eccentricity — 0.0136807 • Orbit Period — 106.27 minutes • Apsis — gee

Hisaki was launched with an Epsilon rocket, which was its first flight. The four-stage Epsilon rocket flew from the Mu rocket launch complex at the Uchinoura Space Center. The launch occurred at 05:00 UTC on 14 September 2013, following a scrubbed launch attempt on 27 August 2013. Following its successful insertion into orbit and deployment of its solar arrays, the satellite was renamed Hisaki, having been designated SPRINT-A until that point. Hisaki was named after a cape literally Cape Fire used by local fishermen to pray for safe travels in the eastern part of Kimotsuki, Kagoshima near the Uchinoura Space Center, but has the additional meaning of "beyond the Sun". An old name for the mission was EXCEED (Extreme Ultraviolet Spectroscope for Exospheric Dynamics).

Hisaki carries an extreme ultraviolet spectrometer, which is used to study the composition of the atmospheres and the behavior of the magnetospheres of the planets of the Solar System. Designed for a one-year mission, Hisaki was operated in a low Earth orbit with a perigee of 950 km, an apogee of 1150 km, 31 degrees of inclination and a period of 106 minutes. In 2016, Hisaki recorded dust storms on Mars altering the upper atmosphere. In October 2020, it performed joint observation with the BepiColombo probe which performed a flyby of Venus en route to Mercury. In 2023, Hisaki performed joint observations with Juno orbiter. It was decommissioned on 8 December 2023 due to accuracy issues.