ESO Exposure Time Calculators     

10/03/2017, Version P100.2: Update of Gravity ETC and Calvin
Update of the limiting magnitudes in the Gravity ETC and Calvin. Polarization Splitting option for Gravity in Calvin.

07/03/2017, Version P100.1: Bug Fix in the Sky Model (Moon Phase)
A bug prevented many ETCs to properly take into account the user input for the Moon Phase in the period from 28/02/2017 to 07/03/2017. The following ETCs were affected: FORS2 Spectroscopy, VIMOS-MOS/IFU, EFOSC2 Spectroscopy, GIRAFFE, MUSE and KMOS
Documentation and Tools News and Notes
  • Frequently Asked Questions
  • Formula Book
  • Database of efficiency profiles
  • Retired ETCs
  • Historic ETC versions:
  • SkyCalc Sky Model Calculator
  February 28, 2017: ETCs Released for CfP P100 phase1
  • All ETCs: New version numbering scheme, corresponding explicitly to the period
    plus a suffix successively increasing for any update, e.g. P100.0, P100.1,...
  • All ETCs: Changed default values of seeing, airmass, moon phase and PWV.
  • All ETCs: Minor changes in results due to sky model parameter alignments.
  • SPHERE ETCs updated.
  • GRAVITY ETC updated.
  • CalVin updated.
  • SOFI ETCs updated with new sky model.
  • FORS spectroscopy ETC: Introduced a check for valid input combinations.
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   VIMOS 
SPHERE-IRDIS  SPHERE-ZIMPOL 
VISIR  SPHERE-IFS 
VIMOS-MOS  VIMOS-IFU 
Paranal UT4 HAWK-I  SINFONI  MUSE 
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