Sky Rates

Updated on June 9, 2021, 9:24 am

Sky Rates for 16 channel mode

(last measured 21 Oct 2000)

To aid in planning observations, we've measured sky rates with the Mosaic II for moonless sky. Note that these are given in electrons/sec and are the average for all 8 CCDs. Given that several of the CCDs have low full wells (above), one must be especially careful with the I filter to not limit the dynamic range of the observations (e.g., a 20 min exposure only leaves you a usable range of 10000 counts).

 

  U B V R I
SKY (e-/s) 0.5 2.6 8.1 17.2 27.6