ETC Request ID: STIS.ta.1407242

Exposure time (seconds) = 4.0000

gives: SNR = 143.3477

gives: Time to Saturation (for a single exposure) = 42.34 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 5,303.067 21,212.27 145.64
    Background 0.987 3.95 1.99
        Sky 0.744 2.98 1.72
        Dark Current 0.243 0.97 0.99
    Read Out 26.10
Total in selected region 5,304.054 21,216.22 147.98
Brightest Pixel (single exposure) 2,834.352 11,337.41
Global Count Rates
    Source only 10,114.972 40,459.887
    Background (sky+dark) 114,977.204 459,908.82
Background per unit area
    Sky Background (arcsec-2) 33.060 132.241
    Dark Current (arcsec-2) 10.800 43.200
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 4406.16 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 WD1657+343 (DAI, 16.1) [900.0, 300000.0]
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 28.1