Hayabusa2 Orbit Determination study published

A paper led by Keiko Yamamoto of National Astronomical Observatory is published on Earth, Planets and Space.  The orbits of Hayabusa2 spacecraft and the GM of Ryugu are investigated.  Otsubo is involved in the key part of orbit analysis. 

K. Yamamoto, T. Otsubo, et al., Dynamic precise orbit determination of Hayabusa2 using laser altimeter (LIDAR) and image tracking data sets, Earth, Planets and Space, 72:85, https://doi.org/10.1186/s40623-020-01213-2, 2020.

VLBI Orbit Determination Simulation study published

A paper written by Grzegorz Klopotek of Chalmers University of Technology, Sweden, in collaboration with Otsubo, is published on Journal of Geodesy.   This is a challenging research seeking a possibility of VLBI technique for precise orbit determination of Earth orbiting satellites. 

G. Klopotek, T. Hobiger, R. Haas, T. Otsubo, Geodetic VLBI for precise orbit determination of Earth satellites: a simulation study, Journal of Geodesy, 94:56, https://doi.org/10.1007/s00190-020-01381-9, 2020.


New Satellite Photometry Study Published

The paper describing how to optically detect small irregularity on the surface of a satellite is now published in Acta Astronautica.   Available online 23 April 2020.

D. Kucharski, G. Kirchner, T. Otsubo, S. K. Flegel, H. Kunimori, M. K. Jah, F. Koidl, J. C. Bennett, M. Steindorfer, P. Wang, Quanta Photogrammetry of Experimental Geodetic Satellite for remote detection of micrometeoroid and orbital debris impacts, 174, 24-31, Acta Astronautica, 2020.


New SLR CoM study published

A UK-Japan joint paper is now published. This study tackled one of the largest unsolved issues in geodesy: TRF Scale. Thank you José, great achievement.

Authors: José Rodríguez, Graham Appleby and Toshimichi Otsubo
Title: Upgraded modelling for the determination of centre of mass corrections of geodetic SLR satellites: impact on key parameters of the terrestrial reference frame
Journal of Geodesy (available online on 16 Nov 2019)

GGOS Japan ウェブページ開設

国土地理院 栗原さんのご尽力により,GGOS Japan(2019年5月に GGOS ワーキンググループより改称)のウェブサイトが開設されました.GGOS Affiliate として,GGOS 本体のサイト ggos.org の下に設置させていただいています.ウィーンの GGOS 事務局の方々にもお世話になりました.

昨年大量に印刷したリーフレットを少しだけ更新した 2019.06 版も置かれています.


2019 測地学サマースクール@国土地理院


Ajisai reflectivity study published

A new study on Japanese Geodetic Satellite Ajisai, led by Dr D Kucharski, has just been published online. Using a photometry observation system in Graz, Austria, the reflectivity of Ajisai surface could be very precisely monitored.
Otsubo is one of the coauthors.

Authors: D. Kucharski, G. Kirchner, T. Otsubo, H. Kunimori, M. K. Jah, F. Koidl, J. C. Bennett, H-C Lim, P. Wang, M. Steindorfer, K. Sośnica
Title: Hypertemporal photometric measurement of spaceborne mirrors specular reflectivity for Laser Time Transfer link model
Journal: Advances in Space Research (Available online 28 May 2019)