4MOST (for 4-metre Multi-object Spectroscopic Telescope)
is an fiber-fed opticalmulti-object spectrograph on
VISTA, having replaced VIRCAM, the telescope's original camera.
4MOST intends to simultaneously obtain spectra for
2400 objects over a 4 square degreefield.
It was installed in 2024 and commissioning is in progress,
with normal operation expected in 2026.