Astro (Korean: 아스트로; stylized in all caps) is a South Korean boy band formed by Fantagio.[1] The group is composed of four members: MJ, Jinjin, Cha Eun-woo, and Yoon San-ha.[2] Originally a sextet, Rocky departed from the group on February 28, 2023,[3] and Moonbin died on April 19, 2023.[4] 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.[5]