is a small Apollo near-Earth asteroid discovered on 16 February 2021 by the Pan-STARRS 1 survey at Haleakala Observatory, Hawaii. On 4 March 2021 at 8:59 UTC, it passed from Earth. During the close approach, it trailed across the Northern Hemisphere sky and brightened up to apparent magnitude of 14.6. Extensive observations of during the encounter revealed that it is an elongated, stony asteroid approximately in diameter, with a rapid rotation period of 50 seconds. The asteroid's spin axis is unusually oblique relative to its orbital plane, contrary to predictions from the YORP effect.
A lightcurve study made by the Harvard University, shows that may be a contact binary.
References
External links Near-Earth asteroid 2021 DW1 very close encounter: an image – 03 Mar. 2021, Gianluca Masi, Virtual Telescope Project, 4 March 2021