Las Campanas Observatory Exposure Time Calculator

Observatories of the Carnegie Institution for Science

Slit Spectroscopy Fiber Spectroscopy Direct Imaging Instrument Specific ETCs

Target Spectral Template   Target AB Magnitude   Target AB Magnitude Filter

Add Emission Line   Line Wavelenght [A]   Line Flux [erg/(s cm^2)]   Line FWHM [A]

Instrumental Setup Telescope   Instrument   Instrument Mode   Slit Width [arcsec]

Binning Spatial Direction   Binning Spectral Direction

Observing Conditions Days from New Moon   Airmass   Seeing FWHM [arcsec]

Exposure and Extraction Parameters Single Frame Exposure Time [seconds]   Number of Exposures to Coadd   Extraction Aperture [arcsec]

It takes about 10 seconds... be patient.

2022-05-17: Efficiencies/Zeropoints updated.
2020-11-30: Efficiencies/Zeropoints updated. For maintanance issues, contact D. Sanmartim at
2016-10-18: This is a BETA Version written by Guillermo A. Blanc and Francesco Di Mille. It has not been fully validated. Use at your own risk.