Lightspeed ETC

Sensor Properties

Select Sensor

Pixel Size (μm)

Read Noise (e⁻/pix)

Dark Current (e⁻/pix/s)

Quantum Efficiency

Nonlinearity Scale Factor

Full Well Capacity

Telescope Properties

Select Telescope

Diameter (cm)

F/number

Telescope Throughput

Altitude (m)

Observing Properties

Exposure Time (s)

Exposures in Stack

Select Filter

Instrument Throughput

Limiting SNR

Seeing (arcsec)

Object Zenith Angle (deg)

Lunar Phase (deg)

Object-Moon Separation (deg)

Aperture Radius (pix)

General Results

Pixel Scale (arcsec/pix)

Pivot Wavelength (Å)

PSF FWHM (arcsec)

Central Pixel Ensquared Energy (%)

A_eff at Pivot Wavelength (cm²)

Limiting AB magnitude

Saturating AB magnitude

Airmass

Zero Point AB Magnitude (1 e⁻/s)

t_exp where bkg noise = read noise (s)

Spectrum Observation

Flat spectrum at AB magnitude:

Blackbody Spectrum

Temperature (K) Distance (Mpc) Bolometric Luminosity (erg/s)

Custom spectrum name from spectra.py:

Spectrum Results

Signal (e⁻)

Total Noise (e⁻)

SNR

Photometric Precision (ppm)

Aperture Size (pix)

Noise Breakdown

Lightspeed Exposure Time Calculator