1. The problem statement, all variables and given/known data The WIYN 3.5m telescope has a multi-object spectrograph called “Hydra.” The instrument has 100 independently deployable fibers that can be placed anywhere over a 1 degree field of view (FoV). Assume the FoV is a circle one degree in diameter. You can get a spectrum through each fiber, but the spectrograph will only allow you to look at 100nm at a time (e.g. 400nm-500nm). Assume you have detected a cluster of galaxies at a redshift of z~0.01. Your initial estimate is that the cluster spans a bit less than one degree on the sky. Question : In order to carry out some observations you’ll first want to predict what the apparent magnitudes of the three brightest galaxies to be. You also need to predict how many galaxies you expect to see that are 3 magnitudes fainter than the brightest galaxy in the cluster. I have absolutely no idea where to start, this is a weird question.