Space Bulletin 002 ARLS002
From ARRL Headquarters
Newington, CT December 2, 2025
To all radio amateurs
SB SPACE ARL ARLS002
ARLS002 “Space Sailors” Seeking Download Help from Ham Radio Operators
A group of students at Cornell University is seeking participation from radio amateurs who are equipped with satellite stations for help in listening for signals from a retroreflective laser sail that is scheduled to be deployed later this week. The sail is currently attached to a 1U CubeSat that was launched early Tuesday, December 2, 2025, from the International Space Station, but will separate and become its own free-flying spacecraft equipped with four tiny “ChipSat” flight computers that will transmit telemetry data back to Earth.
This is the first flight of their ChipSats, and it is this data that the students seek help detecting, according to Ph.D. candidate Joshua Umansky-Castro, who has an amateur radio license, call sign KD2WTQ. The light sail’s ChipSats will be transmitting data using the LoRa digital protocol on 437.400 MHz. The sail, stowed within the CubeSat, is expected to be released a couple of days after deployment – tentatively this Thursday, December 4 – and will likely function independently for no more than 48 hours due to the drag created by the sail.
Additional information, including LoRa parameters and links to a list of compatible receivers and the decoder file, may be found at the https://alphacubesat.cornell.edu site in the ChipSat Ground Station Guide located at https://cornell.app.box.com/s/n4se5ku0ltjb1of2piagfz1y7xa92n47.
It is hoped that the ChipSat and light sail will become the trailblazers for future missions around the solar system, and one day to our closest stellar neighbor, Alpha Centauri.
