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| Mission type | Ultraviolet astronomy |
|---|---|
| Operator | JAXA |
| COSPAR ID | 2013-049A |
| SATCATno. | 39253 |
| Website | www |
| Mission duration | ~1 year planned (science phase)12 years, 4 months and 30 days (achieved) |
| Spacecraft properties | |
| Bus | NEXTAR NX-300L |
| Manufacturer | NEC |
| Launch mass | 348 kg (767 lb) |
| Dimensions | 4×1×1 m (13.1×3.3×3.3 ft) |
| Power | 900 watts |
| Start of mission | |
| Launch date | 14 September 2013, 05:00 (2013-09-14UTC05Z) UTC |
| Rocket | Epsilon |
| Launch site | Uchinoura |
| End of mission | |
| Disposal | Decommissioned[1] |
| Deactivated | 8 December 2023 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Semi-major axis | 7,431.52 kilometres (4,617.73 mi)[2] |
| Eccentricity | 0.0136807[2] |
| Perigee altitude | 957.9 kilometres (595.2 mi)[2] |
| Apogee altitude | 1,161.8 kilometres (721.9 mi)[2] |
| Inclination | 29.72 degrees[2] |
| Period | 106.27 minutes[2] |
| Epoch | 23 January 2015, 18:21:14 UTC[2] |
Hisaki, also known as theSpectroscopic Planet Observatory for Recognition of Interaction of Atmosphere (SPRINT-A) was a Japaneseultraviolet astronomy satellite operated by theJapan Aerospace Exploration Agency (JAXA). The first mission of the Small Scientific Satellite program,[3] it was launched in September 2013 on the maiden flight of theEpsilon rocket. It was used forextreme ultraviolet observations of the Solar System planets.
Hisaki was decommissioned by deactivation on 8 December 2023.[1]
Hisaki was launched with anEpsilon rocket, which was its first flight. The four-stage Epsilon rocket[4] flew from theMu rocket launch complex at theUchinoura Space Center. The launch occurred at 05:00 UTC on 14 September 2013, following a scrubbed launch attempt on 27 August 2013.[5] Following its successful insertion into orbit and deployment of itssolar arrays, the satellite was renamedHisaki, having been designated SPRINT-A until that point.[6]
Hisaki was named after a cape Hisaki (火崎,literally Cape Fire) used by local fishermen to pray for safe travels in the eastern part ofKimotsuki, Kagoshima near theUchinoura Space Center, but has the additional meaning of "beyond the Sun".[7][8] An old name for the mission wasEXCEED (Extreme Ultraviolet Spectroscope for Exospheric Dynamics).[9]
Hisaki carries anextreme ultravioletspectrometer, which is used to study the composition oftheatmospheres and the behavior of themagnetospheres of the planets of the Solar System.[10] Designed for a one-year mission, Hisaki was operated in alow Earth orbit with aperigee of 950 km (590 mi), anapogee of 1,150 km (710 mi), 31 degrees ofinclination and aperiod of 106 minutes.[11]
In 2016, Hisaki recorded dust storms on Mars altering the upper atmosphere.[12]
In October 2020, it performed joint observation with theBepiColombo probe which performed a flyby of Venus en route to Mercury.[13]
In 2023, Hisaki performed joint observations withJuno orbiter.[14]
It was decommissioned on 8 December 2023 due to accuracy issues.[15]
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