PFS spectrograph observed sky spectra!
![](https://pfs.ipmu.jp/blog/wp-content/uploads/2021/02/SuNSSSky_example1-176x176.png)
As shown in the last article, the first fiber cable unit was installed on the Subaru telescope. In fact, in the same period, we have installed another instrument — a miniature telescope called “SuNSS” to study sky spectra at Mt. Maunakea. Since night-sky emission originates from the atmosphere, any spectra observed by ground-based telescopes contain sky component as a noise…. Read more »