ESO Exposure Time Calculators     

Documentation and Tools		News and Notes
Frequently Asked Questions Formula Book Database of efficiency profiles Previous ETC versions: select... P93 phase 1 (Sep.2013) [last FORS1, last ISAAC] P93 phase 2 (Dec.2013) [last EMMI, 1st MUSE] P94 phase 1 (Mar.2014) P94 phase 2 (Jun.2014) P95 phase 1 (Sep.2014) [1st VISIR] P95 phase 2 (Dec.2014) [last oCRIRES] P96 phase 1 (Mar.2015) P96 phase 2 (Jun.2015) P97 phase 1 (Sep.2015) P97 phase 2 (Dec.2015) P98 phase 1 (Mar.2016) [last NACOsp, 1st GRAVITY] P98 phase 2 (Jul.2016) P99 phase 1 (Aug.2016) P99 phase 2 pre-bugfix (Dec.20,2016-Jan.17,2017) P99 phase 2 post-bugfix (Jan.17,2017) P100 (until Jun, 2017) P101 (until Dec 20, 2017) P101.6 (until Feb 28, 2018) [last VIMOS] P102.0 (until Mar 22, 2018) P102.1 (until Mar 27, 2018) P102.7 (until Aug 14, 2018) P103.3 (until Dec 21, 2018) P103.5 (until Feb 28, 2019) P104.0 (until Mar 28, 2019) P104.1 (until Aug 29, 2019) P105.0 (until Sept 24, 2019) SkyCalc Sky Model Calculator - with advanced Almanac - command-line interface skycalc_cli		P109 - August 26, 2021 CRIRES ETC:    Introduced support for polarimetry and off-axis NGS AO guiding MUSE ETC:    Updated Instrument Transfer Function (ITF) model