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| H-IIA F5 | |
|---|---|
| Name | H-IIA F5 |
| Operator | Mitsubishi Heavy Industries / Japan Aerospace Exploration Agency |
| Rocket | H-IIA |
| Launch date | 2006-02-24 |
| Launch site | Tanegashima Space Center |
| Payload | Interplanetary probe Akatsuki and IKAROS (secondary) |
| Outcome | Partial success / secondary success |
H-IIA F5 H-IIA F5 was the fifth operational flight of the H-IIA family carried out by Mitsubishi Heavy Industries in cooperation with the Japan Aerospace Exploration Agency. The mission launched interplanetary payloads including the Venus probe Akatsuki and the solar sail demonstrator IKAROS, continuing Japan's planetary exploration program linked to earlier projects such as Hayabusa and Nozomi. The flight built on technologies tested on missions like H-IIA F4 and contributed to later programs including Epsilon (rocket) and international collaborations with NASA and European Space Agency.
The mission integrated industrial experience from Mitsubishi Heavy Industries and institutional expertise from JAXA and drew on engineering heritage from the H-II series and the H-IIB development. Primary objectives reflected strategic goals set by Japan's Basic Plan on Space Policy and the Institute of Space and Astronautical Science roadmap, aligning with international milestones such as the Venus Express mission timeline and cooperative science goals with NASA laboratories and the Royal Society. Launch readiness involved coordination with agencies including the Ministry of Education, Culture, Sports, Science and Technology (MEXT) and oversight by the Japan Meteorological Agency for range safety.
Primary payload Akatsuki (also known as the Venus Climate Orbiter) carried instruments developed by institutions like the Institute of Space and Astronautical Science and universities including The University of Tokyo, Tohoku University, Kyoto University, Osaka University, and the National Astronomical Observatory of Japan. Science goals targeted Venusian atmospheric dynamics, cloud physics, and surface thermal properties, complementing datasets from Venus Express and historical missions such as Pioneer Venus and Venera 15. Instrument suites referenced research from the National Institute of Polar Research and the Japan Aerospace Exploration Agency's Institute of Space and Astronautical Science, deploying cameras and spectrometers akin to instruments used on Akatsuki's contemporaries like Magellan (spacecraft). Secondary payload IKAROS involved solar sail technology demonstrations led by JAXA engineers and academics from Waseda University and ISAS, aiming to validate membrane deployment, thin-film photovoltaics, and attitude control concepts of interest to projects at Kyushu University and Tohoku University.
The launch vehicle was an H-IIA 202 configuration developed by Mitsubishi Heavy Industries with propulsion from LE-7A and SRB-A technologies previously used in the H-II program. The vehicle architecture referenced subsystems from the Tanegashima Space Center launch complex and avionics influenced by designs from contractors including NEC and IHI Corporation. Guidance and telemetry systems integrated heritage components from prior missions such as Kaguya (SELENE) and Hayabusa2 testbeds. Range safety and mission assurance involved coordination with Japan Aerospace Exploration Agency flight control teams and the Tanegashima Space Center operations group.
Liftoff occurred from Tanegashima Space Center's Yoshinobu Launch Complex after campaign activities coordinated with the Ministry of Education, Culture, Sports, Science and Technology (MEXT) and local authorities on Tanegashima Island. The campaign followed checkouts referencing procedures from earlier launches such as H-IIA F3 and preflight schedules patterned on the H-IIA F4 campaign. The mission timeline placed the Venus encounter window in accordance with celestial mechanics studies from NAOJ and orbital dynamics teams at JAXA and coordinated launch opportunities with analysis groups at ISAS.
The ascent profile employed core stage burns, solid rocket booster separation, and second stage reignition sequences analogous to procedures validated on H-IIA F2 and H-IIA F6 missions. Following parking orbit insertion, transfer maneuver planning for Akatsuki and IKAROS used deep space navigation support from the JAXA Usuda Deep Space Center and trajectory analysis groups collaborating with NASA/JPL scientists and advisers from the European Space Agency mission planning community. On approach to Venus, cruise operations relied on attitude control algorithms tested in conjunction with teams from The University of Tokyo and Osaka University laboratories. The flight sequence incorporated contingency plans informed by prior planetary attempts like Nozomi and other Japanese interplanetary efforts.
Post-launch, IKAROS successfully demonstrated solar sail deployment and power generation technologies, influencing follow-on sail concepts explored by teams at Waseda University and industry partners including Mitsubishi Heavy Industries. Akatsuki experienced a main engine failure during Venus orbit insertion but later achieved a scientifically valuable orbit after recovery efforts led by ISAS and international collaborators, contributing to atmospheric studies comparable to insights from Venus Express and earlier Venera missions. Data from the mission informed subsequent Japanese projects such as SLIM (spacecraft) planning and contributed expertise to propulsion and mission operations adopted by Epsilon (rocket) and later JAXA planetary proposals. The flight reinforced cooperation channels with NASA, ESA, and academic institutions including Kyoto University and Tohoku University, shaping Japan's role in comparative planetology and advanced spacecraft engineering.
Category:Spacecraft launched by H-IIA