Quasi-moon 2023 FW13 is very small and dark, so it reflects very little sunlight. Its orbit is unusual, as it drifts far from Earth and blends in with the background stars. Modern sky surveys, like Pan-STARRS and the Canada-France-Hawaii Telescope, have only recently become sensitive enough to spot such faint objects. As a result, 2023 FW13 remained hidden for decades, silently orbiting with Earth until now.