FEROS Exposure Time Calculator

The default values have been updated in Feb. 2004 to the configuration at the 2.2m telescope. A copy of the code can be obtained here.

The calculator computes the S/N per pixel (1 resolution element = 2.2 pixels) for a given exposure time.

Calculations are based on measured performances during the FEROS Commissioning.

Object

Magnitude in V:
spectral type:
reddening E(B-V):

Observing conditions

Moon brightness:
seeing (arcsec):
airmass:
Temperature (centigrade):
atmospheric pressure (hPa):
relative humidity (percent):

CCD

readout noise (electrons):
dark current (electrons/hour/pixel):
full well capacity (electrons):

Exposure

Exposure time (sec):
Number of fibers: 1 2

Telescope

mirror diameter (cm):
telescope efficiency:

   

Feros documentation