ETC Request ID: WFC3UVIS.im.908565

Exposure time (seconds) = 7,280.0000

gives: SNR = 8.6659

gives: Time to Saturation (for a single exposure) = 1,991,749.61 seconds

gives: Optimum SNR = 18.9029


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (circle with radius 0.2 arcsec)
    Source 0.152 1,106.94 33.27
    Background 0.309 9,377.33 96.84
        Sky 0.123 893.07 29.88
        Dark Current 0.186 1,356.26 36.83
        Post Flash 7,128.00 84.43
    Read Out 76.37
Total in selected region 0.461 10,484.27 127.74
Brightest Pixel (single exposure) 0.034 41.61
Global Count Rates
    Source only 0.185 1,347.187
    Background (sky+dark) 64,365.096 468,577,895.78
    Post Flash 1,478,557,696.00
Background per unit area
    Sky Background (arcsec-2) 0.976 7,106.824
    Dark Current (arcsec-2) 1.467 10,677.550
    Post Flash (arcsec-2) 56,722.82
Extraction region
circle with radius 0.2 arcsec
    Effective Sky Area (pixels) 80.14
    Fraction of flux 0.82
    Fraction of flux in brightest pixel 0.16
Effective Wavelength 2875.67 Å

Instrument name: WFC3UVIS
Mode: imaging
Detector: UVIS2
Bandpass: [F275W] UV Wide
# Frames: 8
Post Flash: 11 e-


Target: [point source]
Spectrum: Pickles Models G2V 5636.38K
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.48 applied before normalization
Normalization: Renormalized to vegamag = 21.0 in filter ACS/WFC1/F555W
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.1.1