Astro (Korean: 아스트로; stylized in all caps) is a South Korean boy band formed by Fantagio. The group is composed of four members: MJ, Jinjin, Cha Eun-woo, and Yoon San-ha. Originally a six-piece group, Rocky departed from the group on February 28, 2023, and Moonbin died on April 19, 2023. They debuted on February 23, 2016, with the extended play Spring Up and were subsequently named as one of the best new K-pop acts of 2016 by Billboard.