Sofía Marchant

Sofía maintains all five instruments and rebuilt Vaciado's secondary cell in 2019 after the original one lost collimation every time the temperature crossed zero.

The site swings about eighteen degrees between afternoon and pre-dawn. That is the single biggest engineering constraint here, and most of the maintenance calendar is a response to it.

Takes First Dark sessions when the schedule needs a second pair of hands, mainly because it is the session where someone is most likely to ask how the telescope works rather than what it is pointed at.