2023 FY₃ is a near-Earth object roughly 5 meters (16 ft) in diameter discovered by K. W. Wierzchos observing with the 0.68-m Schmidt + 10K CCD of the Catalina Sky Survey.^[1]

The object orbits the Sun but makes slow close approaches to the Earth–Moon system. Due to its Earth-like orbit, the object might be of artificial origin or lunar ejecta. However, visible spectroscopy obtained with the Gran Telescopio Canarias shows that it is an asteroid.^[5] The closest approach to Earth in 2023 was 24 March 2023 at roughly 0.00369 au (343,000 mi) when it had a relative velocity of 1.46 km/s (3,300 mph).^[3]

The reflectance spectrum of 2023 FY₃ suggests that its origin is not artificial and also that it is not lunar ejecta;^[5] it is also different from the V type of 2020 CD3 and the K-type of 2022 NX₁.^[5] It is a S type asteroid and considering typical values of the albedo of the S-type asteroids and its absolute magnitude, 2023 FY₃ may have a size range of 5 m.^[5] Its light curve gives a rotation period of 9.3±0.6 min with an amplitude of 0.48±0.13 mag.^[5] This small asteroid roams the edge of Earth's co-orbital space and it is part of the Arjuna class. Currently exhibits horseshoe-like resonant behavior and experienced minimoon engagements of the temporarily captured flyby type in the past that may repeat in the future.

• 1991 VG – near-Earth asteroid temporarily captured by Earth after its discovery in 1991
• 2006 RH120 – the first temporary Earth satellite discovered in situ 2006
• 2020 CD3 – another temporary Earth satellite discovered in 2020
• 2022 NX1 – another temporary Earth satellite discovered in 2022
• 2020 SO – a suspected near-Earth object identified as a rocket booster from the Surveyor 2 mission