深宇宙追跡技術グループ

研究キーワード

電波天文学 ,Radio Astronomy

研究分野

自然科学一般 / 天文学 /

経歴

1991年

-

1992年

学術振興会特別研究員

1991年

-

1992年

Researcher in Japan Society for the Promotion of Science

1992年

- 文部省宇宙科学研究所助手

1992年

- The Institute of Space and Astronautical Science

学歴

-

1991年

東京大学理学系研究科天文学

-

1991年

東京大学

-

1986年

東京大学理学部天文学

-

1986年

東京大学

論文

<6 7 8910 >

Evaluation of differential VLBI phase delay observable for Spacecraft Navigation - ΔVLBI observation of Hayabusa at touchdown to ITOKAWA -

Mamoru Sekido Ryuichi Ichikawa Makoto Yoshikawa Hiroshi Takeuchi Takaji Kato Nanako Mochizuki Yasuhiro Murata Tsutomu Ichikawa

Proceedings of the SICE Annual Conference 3029-3036 2007年

This report describes the evaluation of Δ VLBI delay measurement accuracy for Spacecraft Navigation. At the epochs of Hayabusa's touchdown to asteroid Itokawa, we made Δ VLBI observation for Hayabusa with Japanese domestic VLBI stations. Since the...

Intraday variability feature and milliarcsecond-scale structure in PKS 1622-297

Wajima Kiyoaki Bignall Hayley E Kobayashi Hideyuki Hirabayashi Hisashi Murata Yasuhiro Edwards Philip G Tsuboi Masato Fujisawa Kenta

JOURNAL OF THE KOREAN PHYSICAL SOCIETY 49(4) 1851-1855 2006年10月 [査読有り]

Bigradient phase referencing

Akihiro Doi Kenta Fujisawa Asao Habe Mareki Honma Noriyuki Kawaguchi Hideyuki Kobayashi Yasuhiro Murata Toshihiro Omodaka Hiroshi Sudou Hiroshi Takaba

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 58(4) 777-785 2006年8月 [査読有り]

We propose bigradient phase referencing (BPR), a new radio-observation technique, and report on its performance using the Japanese very-long-baseline-interferometry network (JVN). In this method, a weak source is detected by phase-referencing usin...

Preshaping profiler for flexible spacecraft rest-to-rest maneuvers

Toshio Kamiya Ken Maeda Naoto Ogura Tatsuaki Hashimoto Shin Ichiro Sakai Yasuhiro Murata Nanako Mochizuki

Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference 2006 2 948-956 2006年

A new feedforward algorithm for flexible spacecraft maneuvers is presented. This algorithm is designed particularly for single-axis rest-to-rest rotational maneuvers (switching maneuvers) with linear actuators. Generally spacecraft with large flex...

Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297

Kiyoaki Wajima Hayley E. Bignall Hideyuki Kobayashi Hisashi Hirabayashi Yasuhiro Murata Philip G. Edwards Masato Tsuboi Kenta Fujisawa

Publications of the Astronomical Society of Japan 58(2) 223-232 2006年 [査読有り]

We made a high-resolution VLBI observation of the gamma-ray loud quasar PKS 1622-297 with the HALCA spacecraft and ground radio telescopes at 5 GHz in 1998 February, almost 3 yr after the source exhibited a spectacular GeV gamma-ray flare. The sou...