LIRIS
Long-slit Intermediate Resolution Infrared Spectrograph for the WHT
INSTRUMENT PERFORMANCE

Imaging Mode

We have estimated the limiting magnitude using broad band filters for a S/N ratio equals 5 and good observing conditions with seeing of 0.75 arcsecond. The sky brightness is taken  as  Z=17.3 mag/sq. arcsec, J=16.0 mag/sq. arcsec, H=14.0 mag/sq. arcsec and K=13 mag/sq. arcsec.



We also show the variation of limiting magnitude as function of the  seeing.

 


Spectroscopic Mode

We have estimated the limiting magnitude in spectroscopy using R=1000 , for a S/N ratio equals 3 and good observing conditions with seeing of 0.5 arcsecond (slit width matches the seeing).

 
 

LIRIS Exposure Time calculator

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Last modified: 18/10/04

Page mantained by: Jose Acosta