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.