ETC Request ID: STIS.ta.1368229

Requested Signal/Noise Ratio = 100.000

gives: Time = 1.7926 seconds

gives: Time to Saturation (for a single exposure) = 50.91 seconds


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 5,913.416 10,600.21 102.96
    Background 0.666 1.19 1.09
        Sky 0.432 0.78 0.88
        Dark Current 0.234 0.42 0.65
    Read Out 25.20
Total in selected region 5,914.082 10,601.40 106.00
Brightest Pixel (single exposure) 2,357.101 4,225.27
Global Count Rates
    Source only 11,826.832 21,200.419
    Background (sky+dark) 54,817.750 98,264.63
Background per unit area
    Sky Background (arcsec-2) 19.221 34.454
    Dark Current (arcsec-2) 10.400 18.643
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 6908.48 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 O5V 41000 4.5
Extinction E(B-V): LMC Diffuse (Rv=3.41) = 0.27 applied before normalization
Normalization: Renormalized to vegamag = 12.98 in filter WFC3/UVIS1/F275W
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2