Performance of Akatsuki/IR2 in Venus orbit: the first year

被引：29

作者：

Satoh, Takehiko ^{[1
,2
]}

Sato, Takao M. ^{[1
]}

Nakamura, Masato ^{[1
]}

Kasaba, Yasumasa ^{[3
]}

Ueno, Munetaka ^{[4
]}

Suzuki, Makoto ^{[1
]}

Hashimoto, George L. ^{[5
]}

Horinouchi, Takeshi ^{[6
]}

Imamura, Takeshi ^{[7
]}

Yamazaki, Atsushi ^{[1
]}

Enomoto, Takayuki ^{[8
]}

Sakurai, Yuri ^{[9
]}

Takami, Kosuke ^{[3
]}

Sawai, Kenta ^{[9
]}

Nakakushi, Takashi ^{[10
]}

Abe, Takumi ^{[1
]}

Ishii, Nobuaki ^{[1
]}

Hirose, Chikako ^{[1
]}

Hirata, Naru ^{[11
]}

Yamada, Manabu ^{[12
]}

Murakami, Shin-ya ^{[1
]}

Yamamoto, Yukio ^{[1
]}

Fukuhara, Tetsuya ^{[13
]}

Ogohara, Kazunori ^{[14
]}

Ando, Hiroki ^{[15
]}

Sugiyama, Ko-ichiro ^{[16
]}

Kashimura, Hiroki ^{[4
]}

Ohtsuki, Shoko ^{[17
]}

机构：

[1] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan

[2] SOKEN DAI, Sch Phys, Dept Space & Astronaut Sci, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan

[3] Tohoku Univ, Grad Sch Sci, Dept Geophys, Aoba Ku, Aramaki Aza Aoba 6-3, Sendai, Miyagi 9808578, Japan

[4] Kobe Univ, Ctr Planetary Sci, Dept Planetol, Chuo Ku, 7-1-48 Minami Machi, Kobe, Hyogo 6500047, Japan

[5] Okayama Univ, Dept Earth Sci, Kita Ku, 3-1-1 Tsushimanaka, Okayama 7008530, Japan

[6] Hokkaido Univ, Fac Environm Earth Sci, N10W5, Sapporo, Hokkaido 0600810, Japan

[7] Univ Tokyo, Grad Sch Frontier Sci, Dept Complex Sci & Engn, Kiban Tou 4H7,5-1-5 Kashiwanoha, Kashiwa, Chiba 2778561, Japan

[8] FAST Corp, 2791-5 Shimotsuruma, Yamato, Kanagawa, Japan

[9] Okayama Univ, Grad Sch Nat Sci & Technol, Kita Ku, 3-1-1 Tsushimanaka, Okayama 7008530, Japan

[10] Wakayama Univ, Fac Tourism, Sakaedani 930, Wakayama 6408510, Japan

[11] Univ Aizu, CAIST, ARC Space, 90 Kami Iawase,Ikki Machi, Aizu Wakamatsu, Fukushima 9658580, Japan

[12] Chiba Inst Technol, Planetary Explorat Res Ctr, 2-17-1 Tsudanuma, Narashino, Chiba 2750016, Japan

[13] Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan

[14] Univ Shiga Prefecture, Sch Engn, 2500 Hassaka Cho, Hikone, Shiga 5228533, Japan

[15] Kyoto Sangyo Univ, Fac Sci, Kita Ku, Kyoto 6038555, Japan

[16] Matsue Coll, Natl Inst Technol, Dept Informat Engn, 14-4 Nishi Ikuma, Matsue, Shimane 6908518, Japan

[17] Senshu Univ, Sch Commerce, Tama Ku, 2-1-1 Higashimita, Kawasaki, Kanagawa 2148580, Japan

来源：

EARTH PLANETS AND SPACE | 2017年 / 69卷

关键词：

Venus; Atmosphere; Orbiter; Akatsuki; Near-infrared; Window; Cryo-cooler; Dynamics; Aerosols; LOWER ATMOSPHERE; CLOUD STRUCTURE; VIRTIS; WINDS; IR2;

D O I：

10.1186/s40623-017-0736-x

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The first year (December 2015 to November 2016) of IR2 after Akatsuki's successful insertion to an elongated elliptical orbit around Venus is reported with performance evaluation and results of data acquisition. The single-stage Stirling-cycle cryo-cooler of IR2 has been operated with various driving voltages to achieve the best possible cooling under the given thermal environment. A total of 3091 images of Venus (1420 dayside images at 2.02 mu m and 1671 night-side images at 1.735, 2.26, and 2.32 mu m) were acquired in this period. Additionally, 159 images, including images of stars for calibration and dark images for the evaluation of noise levels, were captured. Low-frequency flat images (not available in pre-launch calibration data) have been constructed using the images of Venus acquired from near the pericenter to establish the procedure to correct for the IR2 flat-field response. It was noticed that multiple reflections of infrared light in the PtSi detector caused a weak but extended tail of the point-spread function (PSF), contaminating the night-side disk of Venus with light from the much brighter dayside crescent. This necessitated the construction of an empirical PSF to remove this contamination and also to improve the dayside data by deconvolution, and this work is also discussed. Detailed astrometry is performed on star-field images in the H-band (1.65 mu m), hereby confirming that the geometrical distortion of IR2 images is negligible.

引用

页数：19

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