Kep1er (케플러) is a 9 member K-pop project girl group formed through the Mnet survival show Girls Planet 999. The group consists of Yujin, Mashiro, Xiaoting, Chaehyun, Dayeon, Hikaru, Huening Bahiyyih, Youngeun, and Yeseo. The final lineup was announced on October 22, 2021, during the final episode of Girls Planet 999. The group is managed by WAKEONE Entertainment and Swing Entertainment.

Kepler Official Fandom Name: 케플리안
Kepler Official Colors: Lavender & White

Kepler Official Accounts:
Instagram: @official.kep1er
Twitter: @official_kep1er
Facebook: Kep1er
Fancafe: Kep1er
VLive: Kep1er
Youtube: Kep1er
TikTok: @official_kep1er
Weibo: @official_kep1er
Website: hello-kep1er.com

They officially debuted on January 3, 2022, with the mini-album "FIRST IMPACT" and title track "WA DA DA".