ETC Request ID: STIS.ta.1407240

Exposure time (seconds) = 1.0000

gives: SNR = 156.9838

gives: Time to Saturation (for a single exposure) = 8.89 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 25,308.189 25,308.19 159.09
    Background 0.987 0.99 0.99
        Sky 0.744 0.74 0.86
        Dark Current 0.243 0.24 0.49
    Read Out 26.10
Total in selected region 25,309.176 25,309.18 161.22
Brightest Pixel (single exposure) 13,491.412 13,491.41
Global Count Rates
    Source only 48,258.470 48,258.470
    Background (sky+dark) 114,977.204 114,977.20
Background per unit area
    Sky Background (arcsec-2) 33.060 33.060
    Dark Current (arcsec-2) 10.800 10.800
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 0.27
Effective Wavelength 4435.15 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: 50CCD
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Standard HST Star Spectra WD1057+719 (DA1.2, 14.8) [900.0, 300000.0 Å]
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 28.1