The 4MOST Instrument

How long does it take for the fibre positioner to configure the whole field?
4MOST will feature a 2.5 degree diameter field-of-view with 2436 science fibres in the focal surface that will be configured by AESOP, a fibre positioner ba...
Thu, 30 Mar, 2023 at 10:39 AM
How many fibres will be allocated to sky?
While a Calibration Plan has not yet been established, a conservative assumption is that from the total amount of fibres, 50 fibres per spectrograph (i.e. 1...
Mon, 24 Sep, 2018 at 10:18 AM
How will the fibre deterioration be accounted for?
Due to the delicate nature of fibre spines and fibre cables, and their impact on the performance of the instrument, special attention will be paid to monito...
Wed, 23 Jan, 2019 at 10:58 AM
What is the type of the optical fibres used?
All fibres for 4MOST are silica/silica, step-index, multi-mode fibres with polymide coating (buffer), with broad-band transmission from 350-2000 nm and nume...
Wed, 23 Jan, 2019 at 10:58 AM
Are there two focal plates that exchange between observed fields?
No, there is one plate and the fibre allocation is fast enough that it can be efficiently executed during the telescope movement or CCD readout.
Sun, 23 Sep, 2018 at 11:31 AM
What is the throughput of 4MOST fibres?
Using fibre attenuation data provided by the manufacturer, we can make an estimation of the throughput for diferent fibre lengths, however, the following sh...
Wed, 23 Jan, 2019 at 10:58 AM
How will the fibre crosstalk be treated?
Fibre crosstalk can be dealt with on different levels of 4MOST operations. Therefore, efforts are being made to develop an efficient observing strategy, cou...
Wed, 23 Jan, 2019 at 10:58 AM