ETC Request ID: STIS.ta.1398602

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.6188 seconds

gives: Time to Saturation (for a single exposure) = 17.55 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 17,194.413 10,640.59 103.15
    Background 0.675 0.42 0.65
        Sky 0.432 0.27 0.52
        Dark Current 0.243 0.15 0.39
    Read Out 26.10
Total in selected region 17,195.089 10,641.01 106.41
Brightest Pixel (single exposure) 6,836.599 4,230.76
Global Count Rates
    Source only 34,388.827 21,281.184
    Background (sky+dark) 55,864.519 34,571.20
Background per unit area
    Sky Background (arcsec-2) 19.219 11.894
    Dark Current (arcsec-2) 10.800 6.683
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
    Fraction of flux 0.50
    Fraction of flux in brightest pixel 0.20
Effective Wavelength 6922.20 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50LP
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models O3V 45000 4.5
Extinction E(B-V): LMC Diffuse (Rv=3.41) = 0.3 applied before normalization
Normalization: Renormalized to vegamag = 11.914 in filter WFC3/UVIS1/F275W
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 28.1