ETC Request ID: STIS.ta.1451609

Exposure time (seconds) = 2.0000

gives: SNR = 173.3066

gives: Time to Saturation (for a single exposure) = 19.76 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 15,351.454 30,702.91 175.22
    Background 0.675 1.35 1.16
        Sky 0.432 0.86 0.93
        Dark Current 0.243 0.49 0.70
    Read Out 26.10
Total in selected region 15,352.129 30,704.26 177.16
Brightest Pixel (single exposure) 6,073.987 12,147.97
Global Count Rates
    Source only 30,702.908 61,405.815
    Background (sky+dark) 55,864.519 111,729.04
Background per unit area
    Sky Background (arcsec-2) 19.219 38.439
    Dark Current (arcsec-2) 10.800 21.600
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 6949.21 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: User uploaded spectrum: Sk67d20_stis_e140m_newsed.fits
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 13.8 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 28.2