ESO Exposure Time Calculators     

Documentation and Tools News and Notes
  • Frequently Asked Questions
  • Formula Book
  • Database of efficiency profiles
  • Historic ETC versions:
  • SkyCalc Sky Model Calculator
    - with advanced Almanac
    - command-line interface skycalc_cli
  April 24th, 2018: Version P102.4
  • X-SHOOTER:
    Added missing factors in a displayed detailed
    S/N formula. The ETC results are not changed.
ESO Exposure Time Calculators
Imaging Spectroscopy
La Silla EFOSC2  SUSI  WFI  SOFI  EFOSC2  HARPS  FEROS  SOFI 
Paranal UT1 NACO  FORS2  FORS2  KMOS 
Paranal UT2   UVES  UVES-FLAMES  GIRAFFE  X-SHOOTER 
Paranal UT3 VISIR   SPHERE-IRDIS  SPHERE-ZIMPOL  VISIR  SPHERE-IFS
Paranal UT4 HAWK-I  SINFONI  MUSE 
Paranal ICCF   ESPRESSO
Paranal VISTA VIRCAM   
Paranal VST OmegaCAM   
E-ELT E-ELT  E-ELT 
VLTI GRAVITY  VisCalc  CalVin 

Send comments and questions to usd-help@eso.org