Sombra

Sombra is the instrument that does the work nobody watches. Most nights it runs unattended on a target list, and most of its output is a stack of sub-frames that will not look like anything for another two weeks.

The encoders mean it points to within about eight arcseconds and tracks unguided for four minutes at this focal length. Beyond that it takes a guide star.

If you have booked The Long Exposure, this is the telescope you are booking. You will spend more of the night looking at a laptop than at the sky, and we would rather say that now.