ETC Request ID: WFC3UVIS.im.135115

Requested Signal/Noise Ratio = 10.000

gives: Time = 2,715.3854 seconds

gives: Time to Saturation (for a single exposure) = 671,656.45 seconds

gives: Optimum SNR = 21.1891


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (circle with radius 0.2 arcsec)
    Source 0.375 1,018.39 31.91
    Background 0.788 2,140.71 46.27
        Sky 0.748 2,031.91 45.08
        Dark Current 0.040 108.80 10.43
    Read Out 84.92
Total in selected region 1.163 3,159.10 101.84
Brightest Pixel (single exposure) 0.094 25.47
Global Count Rates
    Source only
    Background (sky+dark)
Background per unit area
    Sky Background (arcsec-2)
    Dark Current (arcsec-2)
Extraction region
circle with radius 0.2 arcsec
    Effective Sky Area (pixels) 80.14
    Fraction of flux 0.86
    Fraction of flux in brightest pixel 0.19
Effective Wavelength 4415.57 Å

Instrument name: WFC3UVIS
Mode: imaging
Detector: UVIS1
Bandpass: [F438W] WFPC2 B
# Frames: 10


Target: [point source]
Spectrum: Pickles Models M2V 3548.13K
Extinction E(B-V): Average Galactic = 0.18 applied before normalization
Normalization: Renormalized to Johnson B = 25.74 in magnitudes relative to Vega
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 19.1.1