A Federation research outpost where Klingon raiders attacked the family of the young Michael Burnham, an assault long believed to have killed both her parents and which shaped her whole life.
Doctari Alpha was the site of a human-Vulcan research outpost where Michael Burnham lived as a child with her parents, Gabrielle and Mike Burnham. Klingons raided it in the 2230s, and Michael, hidden in a cupboard, heard the attack. She was afterwards taken in by Sarek and Amanda and raised on Vulcan.
Burnham speaks of the raid in the first season of Discovery, blaming herself because the family had stayed on to watch a nearby star go supernova at her request.
The second-season episodes The Red Angel and Perpetual Infinity reveal the truth. Her parents were working for Section 31 on a time-travel suit, the Klingons had come for the time crystal that powered it, and Gabrielle escaped in the suit, only to be anchored some 950 years in the future.