On 22 and 26 December 2023, on the rooftop of National Institute of Polar Research, Tachikawa, we have successfully received echoes from 4 low-orbit passes using the Omni-SLR system, which is a new style of Satellite Laser Ranging (SLR) – very compact and drastically low-cost.  It is jointly developed by Hitotsubashi University, National Astronomical Observatory of Japan and University of Tokyo.

• Saral (O-C plots below) and Swarm-C on 22 December
• Beacon-C  and Swarm-C on 26 December

We are thankful for those who have supported us, and we plan to continue the development.

A paper on acoustically detecting the direction of closely-flying aircraft is now published in Advances in Space Research.   

Toshimichi Otsubo, Mihoko Kobayashi, Yusuke Yokota, Kenji Kouno, Hiroshi Araki,
Acoustic positioning of closely-flying aircraft for eye safety of space laser applications,
Advances in Space Research,
2023,
https://doi.org/10.1016/j.asr.2023.09.067

10月12日，日本測地学会講演会において，大坪が座長を務める GGOS Japan が日本測地学会坪井賞（団体賞）を受賞しました．幹事の宮原さんとともに記念講演をしてまいりました．

GGOS Japan 記事：https://ggos.org/about/org/affiliates/ggos-japan/

GGOS 記事 (thanks to M Sehnal)：https://ggos.org/news/ggos-japan-tsuboi-prize/

Thanks to Yokota-san (IIS, Univ of Tokyo) and the Geodetic Society of Japan, a Data DOI (https://doi.org/10.57553/2023001) is now assigned to our SLR Quality Feedback Reports (https://geo.science.hit-u.ac.jp/slr/bias/).

This is the very first DOI mining case of Geodetic Data Portal https://geod.jpn.org/datadoi/index_en.html hosted by the Geodetic Society of Japan.

新学期になりました．

2013年に「GGOS ワーキンググループ」として結成して，今年で10年になります．「GGOS Japan」に改名したのは 2019 年でした．ウェブサイト： https://ggos.org/about/org/affiliates/ggos-japan/

今年限定の GGOS Japan 10th Anniversary ロゴができました．