ESO Exposure Time Calculators     

25/01/2017: Bug Fix in VIMOS and OmegaCAM ETCs
The throughput efficieny model in the OmegaCAM ETC and VIMOS ETCs has been wrong by a large factor (100) in the period from 17/01/2017 to 25/01/2017, during which the instrument performances predicted by these ETCs have been very misleading.

17/01/2017: Bug Fix in SOFI and GIRAFFE ETCs

A software bug had led to wrong results in the SOFI ETCs and certain modes of the GIRAFFE ETC in the period from 20/12/2016 until it was corrected on 17/1/2017.

Users who have used the ETCs in a problematic period should re-check their results with the corrected ETCs.
Documentation and Tools News and Notes
  • Frequently Asked Questions
  • Formula Book
  • Database of efficiency profiles
  • Retired ETCs
  • Historic ETC versions:
  • SkyCalc Sky Model Calculator
  December 20, 2016 Release for CfP P99 phase2
  • The KMOS ETC updated with default PWV=10mm value
    and a warning for detetctor persistence
  • The GRAVITY ETC was updated: Baseline configuration,
    Low Resolution in Dual Mode, information requested in the OBs
  • VISIR Spectroscopy ETC: Noise factors and PSF model
    updated
  • New interactive plots have replaced the obsolete Java applets
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