Astro (: 아스트로) (stylized as ASTRO) is a formed by in 2015. The group is composed of six members: Jinjin, MJ, Cha Eunwoo, Moonbin, Rocky, and Yoon Sanha. On August 14, Fantagio released information about the new group via their social media, including pictures and profiles of each member and the announcement of the group's name. Astro means 'star' in Spanish, so the group was named that so they can be stars to those who love them. Astro released their debut mini album Spring Up on February 23, 2016. They released their first music video Hide & Seek on February 22, 2016.
Before Astro was formed, the members started out as trainees under Fantagio iTeen, a rookie talent development program under Fantagio Entertainment. They were previously known as iTeen Boys.
Through the same technique as how Fantagio formed , Astro starred in a web drama series, titled on August 2015. The members starred as themselves along with , 5urprise member and .
On January 2016, Astro starred in their own reality show, Astro OK! Ready, which was aired on at 7PM KST. The group also made an appearance on KBS , Golden Bell Challenge.
2016: Debut with Spring Up & 2nd Mini Album, Summer Vibes
Astro's first mini album, Spring Up was released on February 23, 2016 with the title song "Hide & Seek". They also announced their official fanclub name: AROHA, which is an abbreviation for ASTRO Hearts All Fans. Aroha also means 'love' in Maori (New Zealand native language).
Only three weeks after their debut, Spring Up entered the World Albums Chart at number 6.
Fantagio released a comeback photo of Astro on June 16. Their second mini album, Summer Vibes, is set to be released on July 1.
MembersMJ (엠제이) (birth name: Kim Myungjun; 김명준) born on March 5, 1994 (age 22)Jinjin (진진) (birth name: Park Jinwoo; 박진우) born on March 15, 1996 (age 20)Cha Eunwoo (은우) (birth name: Lee Dongmin; 이동민) born on March 30, 1997 (age 19)Moonbin (문빈) born on January 26, 1998 (age 18)Rocky (라키) (birth name: Park Minhyuk; 박민혁) born on February 25, 1999 (age 17)Sanha (산하) (birth name: Yoon Sanha: 윤산하) born on March 21, 2000 (age 16)