ETC Request ID: STIS.ta.1029810

Exposure time (seconds) = 1.0000

gives: SNR = 351.0212

gives: Time to Saturation (for a single exposure) = 1.89 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 123,818.987 123,818.99 351.88
    Background 0.910 0.91 0.95
        Sky 0.748 0.75 0.86
        Dark Current 0.162 0.16 0.40
    Read Out 24.60
Total in selected region 123,819.897 123,819.90 352.74
Brightest Pixel (single exposure) 63,468.484 63,468.48
Global Count Rates
    Source only 235,087.190 235,087.190
    Background (sky+dark) 106,019.251 106,019.25
Background per unit area
    Sky Background (arcsec-2) 33.243 33.243
    Dark Current (arcsec-2) 7.200 7.200
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 0.26
Effective Wavelength 4867.84 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 Grw+70°5824 (DA3, 12.77) [1140.56, 24976.7 Å]
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 25.2