TY - JOUR
T1 - The first Japan's planetary orbiter AKATSUKI and its scientific results
AU - Nakamura, Masato
AU - Ishii, Nobuaki
AU - Imamura, Takeshi
AU - Satoh, Takehiko
AU - Abe, Takumi
AU - Hirose, Chikako
AU - Yamazaki, Atsushi
AU - Nakatsuka, Junichi
AU - Ichikawa, Tsutomu
AU - Toda, Tomoaki
AU - Toyoda, Hiroyuki
AU - Tachikawa, Sumitaka
AU - Kamata, Yukio
AU - Suzuki, Makoto
AU - Sato, Takao M.
AU - Murakami, Shin Ya
AU - Yamamoto, Yukio
AU - Iwagami, Naomoto
AU - Taguchi, Makoto
AU - Fukuhara, Tesuya
AU - Watanabe, Shigeto
AU - Takahashi, Yukihiro
AU - Ueno, Munetaka
AU - Yamada, Manabu
AU - Hashimoto, George L.
AU - Hirata, Naru
AU - Kouyama, Toru
AU - Ogohara, Kazunori
AU - Ando, Hiroki
AU - Sugiyama, Koichiro
AU - Kashimura, Hiroki
AU - Ohtsuki, Shoko
N1 - Publisher Copyright:
Copyright © 2016 by the International Astronautical Federation (IAF). All rights reserved.
PY - 2016
Y1 - 2016
N2 - Japan's Venus Climate Orbiter Akatsuki was proposed to ISAS (Institute of Space and Astronautical Science) in 2001 as an interplanetary mission. We made 5 cameras with narrow-band filters to image Venus at different wavelengths to track the cloud and minor components distribution at different heights to study the Venusian atmospheric dynamics in 3 dimension. It was launched on May 21st, 2010 and reached Venus on December 7th, 2010. With the thrust by the orbital maneuver engine, Akatsuki tried to go into the westward equatorial orbit around Venus with the 30 hours' orbital period, however it failed by the malfunction of the propulsion system. Later the spacecraft has been orbiting the sun for 5 years. On December 7th, 2015 Akatsuki met Venus again after the orbit control and Akatsuki was put into the westward equatorial orbit whose apoapsis is about 0.44 million km and orbital period of 14 days. Its main target is to shed light on the mechanism of the fast atmospheric circulation of Venus. The systematic imaging sequence by Akatsuki is advantageous for detecting meteorological phenomena with various temporal and spatial scales. We have five photometric sensors as mission instruments for imaging, which are 1 m-infrared camera (IR1), 2 m-infrared camera (IR2), ultra-violet imager (UVI), long-wave infrared camera (LIR), and lightning and airglow camera (LAC). These photometers except LIR have changeable filters in the optics to image in certain wavelengths. Akatsuki's long elliptical orbit around Venus is suitable for obtaining cloud-tracked wind vectors over a wide area continuously from high altitudes. With the observation, the characterizations of the meridional circulation, mid-latitude jets, and various wave activities are anticipated. The technical issues of Venus orbit insertion in 2015 and the scientific new results will be given in this paper.
AB - Japan's Venus Climate Orbiter Akatsuki was proposed to ISAS (Institute of Space and Astronautical Science) in 2001 as an interplanetary mission. We made 5 cameras with narrow-band filters to image Venus at different wavelengths to track the cloud and minor components distribution at different heights to study the Venusian atmospheric dynamics in 3 dimension. It was launched on May 21st, 2010 and reached Venus on December 7th, 2010. With the thrust by the orbital maneuver engine, Akatsuki tried to go into the westward equatorial orbit around Venus with the 30 hours' orbital period, however it failed by the malfunction of the propulsion system. Later the spacecraft has been orbiting the sun for 5 years. On December 7th, 2015 Akatsuki met Venus again after the orbit control and Akatsuki was put into the westward equatorial orbit whose apoapsis is about 0.44 million km and orbital period of 14 days. Its main target is to shed light on the mechanism of the fast atmospheric circulation of Venus. The systematic imaging sequence by Akatsuki is advantageous for detecting meteorological phenomena with various temporal and spatial scales. We have five photometric sensors as mission instruments for imaging, which are 1 m-infrared camera (IR1), 2 m-infrared camera (IR2), ultra-violet imager (UVI), long-wave infrared camera (LIR), and lightning and airglow camera (LAC). These photometers except LIR have changeable filters in the optics to image in certain wavelengths. Akatsuki's long elliptical orbit around Venus is suitable for obtaining cloud-tracked wind vectors over a wide area continuously from high altitudes. With the observation, the characterizations of the meridional circulation, mid-latitude jets, and various wave activities are anticipated. The technical issues of Venus orbit insertion in 2015 and the scientific new results will be given in this paper.
KW - AKATSUKI
KW - Exploration
KW - Venus
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M3 - Conference article
AN - SCOPUS:85016486908
VL - 0
JO - Proceedings of the International Astronautical Congress, IAC
JF - Proceedings of the International Astronautical Congress, IAC
SN - 0074-1795
T2 - 67th International Astronautical Congress, IAC 2016
Y2 - 26 September 2016 through 30 September 2016
ER -