The Lazuli ExtraSolar Coronagraph ETC

High-contrast exposure-time calculator for planet/star contrast, separation, and post-processing assumptions.

Mode

Total exposure and integration time are inputs. Planet SNR is computed.

Source

Magnitude (Vega)

Planet delta mag

Separation (arcsec)

Raw contrast

Bandpass

Fixed for the current ESC configuration.

Background

Zodiacal background (mag/arcsec^2)

Exo-zodiacal background (mag/arcsec^2)

Instrument

Filter

Telescope + ESC throughput curves, by filter-wheel slot.

Filter curves

Noise aperture

Footprint around the planet in which its light is extracted and every noise term is charged. Circle r = 0.7 λ/D: read-noise-limited optimum. Resel: λ/D-diameter disk. Box: n×n pixel square (UA calculator). Matched filter: every pixel weighted. Drawn next to the count-rate plot after Calculate; details on About.

Total exposure time (s)

Integration time (s)

Post processing gain

Result

-

Results will appear here after Calculate.

SNR	-
Source counts (e/s)	-
Sky counts (e/s)	-
Dark current (e/s)	-
Readout noise (e)	-
Read noise equiv. rate (e/s)	-
# psf pixels	-
Speckle counts (e/s)	-
Exozodi counts (e/s)	-

Configuration Summary

Host magnitude

0 Vega

Planet delta mag

20

Raw contrast

0.00000001

Separation

0.4 arcsec

Zodi

22.5

Exo-zodi

21.0

Filter

R2: F630N (630 nm, EOL)

Total exposure

3600 s

ETC version

esc_etc v0.1.0

Git commit

repository

Plots

No plots yet. Run a calculation to generate plots.