WCC ETC v0.6.0 About

Lazuli WCC

The Lazuli Wide-field Context Camera ETC

Exposure-time calculator for the WCC filter mosaic. Choose a source, sky background, and detector setup to compute SNR and count rates.

Mode

Exposure time is an input. SNR is computed after Calculate.

Source

Spectral type

Temperature (K)

Flat spectrum

Alpha

Reference wavelength (A)

Custom spectrum (.csv, .txt, .dat)

Two columns with no header: wavelength in A and flux in FLAM. Comma-separated (e.g. 3500.23,1.366e-16) or whitespace-separated (e.g. 3500.23 1.366e-16) are both accepted. Lines beginning with # are ignored. Custom spectra are treated as absolute flux.

Magnitude (Vega)

Magnitude bandpass

Magnitude system

Background

Zodi background (Vega mag/arcsec2)

Always interpreted as Vega mag, regardless of the source magnitude system.

Background bandpass

Instrument

Sensor and filter

Aperture radius (mas)

Default scales with defocus: 70 mas in focus, 400 mas at ±1 wave, 700 mas at +2 waves. Edit to override.

Jitter (mas)

Exposure time (s)

Number of reads

Science Simulations

Exoplanet Transit optional

Transit — planet

Only confirmed transiting planets are listed. Picking one fills the transit parameters, sets a blackbody source at the host-star T_eff, and anchors the flux with the Johnson V magnitude — correct in every WCC band. Changes are summarized at the top.

Period (d)

Rp/R*

a/R*

Inclination (deg)

Eccentricity

ω (deg)

Limb-darkening u₁

Limb-darkening u₂

Observation window (hours)

Binned points

Result

No result yet. Select inputs and click Calculate.

Metric	Value	Units
SNR	-
Source count rate	-	e/s
Background count rate	-	e/s
Background count rate / pix	-	e/s/pix
Peak PSF pixel	-	e (per frame)
Saturated pixels	0	px (per frame)
Sensor gain	-	e/ADU
Dark current	-	e/s/pix
Well depth	-	e
Read noise	-	e/pix
Pixel size	-	um/pix

Configuration Summary

Source model

pickles

Flux scaling

25.4 Vega

Magnitude band

johnson_r

Background band

Sensor/filter

zwo:r

Exposure

60 s

Aperture radius

70 mas

Jitter

10 mas

ETC version

wcc_etc v0.6.0

Git commit

repository

WCC focal plane

Current WCC layout output from the backend.

Plots

No plots yet. Run a calculation to generate plots.