ETC Request ID: STIS.ta.1431312

Exposure time (seconds) = 0.3000

gives: SNR = 386.2654

gives: Time to Saturation (for a single exposure) = 0.60 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 499,597.747 149,879.32 387.14
    Background 0.675 0.20 0.45
        Sky 0.432 0.13 0.36
        Dark Current 0.243 0.07 0.27
    Read Out 26.10
Total in selected region 499,598.422 149,879.53 388.02
Brightest Pixel (single exposure) 198,415.824 59,524.75
Global Count Rates
    Source only 999,195.494 299,758.648
    Background (sky+dark) 55,864.519 16,759.36
Background per unit area
    Sky Background (arcsec-2) 19.219 5.766
    Dark Current (arcsec-2) 10.800 3.240
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 6928.46 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: Kurucz Models A1V 9230 4.1
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 9.95 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 28.1