Where is Trisolaris?

Excuse me, but could you please clarify where exactly Trisolaris is located? I've heard it mentioned in discussions related to the science fiction series, but I'm unsure if it's a fictional planet or if there's any basis in reality for its existence. Is it a concept purely from the imagination of the author, or does it draw inspiration from any known astronomical bodies? I'm genuinely curious and would appreciate any insights you might have on this intriguing topic.