is a near-Earth object roughly in diameter discovered by K. W. Wierzchos observing with the 0.68-m Schmidt + 10K CCD of the Catalina Sky Survey.
Details 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. The closest approach to Earth in 2023 was 23 March 2023 at roughly when it had a relative velocity of .
The reflectance spectrum of 2023 FY3 suggests that its origin is not artificial and also that it is not lunar ejecta; it is also different from the V type of and the K-type of 2022 NX1. 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. Its light curve gives a rotation period of 9.3±0.6 min with an amplitude of 0.48±0.13 mag. 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.
See also near-Earth asteroid temporarily captured by Earth after its discovery in 1991 the first temporary Earth satellite discovered in situ 2006 another temporary Earth satellite discovered in 2020 another temporary Earth satellite discovered in 2022 2020 SO a suspected near-Earth object identified as a rocket booster from the Surveyor 2 mission
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