Daniel, you are correct! I dug around and found that FITSAT-1 did it. The best write-up of the results I could find is here:
https://www.sciencedirect.com/science/article/abs/pii/S0094576514004019

The wiki page also gives a little info: https://en.wikipedia.org/wiki/Niwaka

-David, N9KT

On Wed, Feb 26, 2025 at 1:47 PM Daniel Lind via AMSAT-BB <amsat-bb@amsat.org> wrote:

Wasn't that done already?


On Wed, Feb 26, 2025, 10:43 David Spoelstra via AMSAT-BB <amsat-bb@amsat.org> wrote:
That's a cool idea. However, I'll bet it would really upset astronomers.

If you used a red LED and flashed out morse code, you could probably read the actual code as streaks in the sky as it passed over!

-David, N9KT

On Wed, Feb 26, 2025 at 1:17 PM Joseph Fitzgerald (KM1P) via AMSAT-BB <amsat-bb@amsat.org> wrote:
Here is an interesting idea to help us figure out what cubesat is which - a light which blinks a unique code to identify a space object.


Maybe it is time for me to dust off the laser receiver stuff I built for AO-40?

Joe Fitzgerald (KM1P)

AMSAT Orbital Elements Manager



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