ETC Request ID: STIS.ta.1009278

Exposure time (seconds) = 0.1000

gives: SNR = 147.3049

gives: Time to Saturation (for a single exposure) = 1.57 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 222,879.044 22,287.90 149.29
    Background 0.162 0.02 0.13
        Sky 8.945e-06 8.94e-07 9.46e-04
        Dark Current 0.162 0.02 0.13
    Read Out 24.60
Total in selected region 222,879.206 22,287.92 151.30
Brightest Pixel (single exposure) 76,509.306 7,650.93
Global Count Rates
    Source only 445,758.088 44,575.809
    Background (sky+dark) 18,874.616 1,887.46
Background per unit area
    Sky Background (arcsec-2) 3.975e-04 3.975e-05
    Dark Current (arcsec-2) 7.200 0.720
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 0.17
Effective Wavelength 7671.93 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND5
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Pickles Models K3III 4365.16K
Extinction E(B-V): None
Normalization: Renormalized to vegamag = -0.05 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 25.2