korekan is a user on mastodon.cosmicanimal.jp. You can follow them or interact with them if you have an account anywhere in the fediverse.
If you don't, you can sign up here.
ロケット詳細は日本語Wikiにもありますね。
https://ja.wikipedia.org/wiki/%E3%83%9E%E3%82%AF%E3%82%B5%E3%82%B9
