ETC Request ID: STIS.ta.1370704

Requested Signal/Noise Ratio = 40.000

gives: Time = 6.5911 seconds

gives: Time to Saturation (for a single exposure) = 808.86 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Partial overlap between instrument throughput band and target spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 317.230 2,090.88 45.73
    Background 0.978 6.44 2.54
        Sky 0.744 4.90 2.21
        Dark Current 0.234 1.54 1.24
    Read Out 25.20
Total in selected region 318.208 2,097.33 52.27
Brightest Pixel (single exposure) 148.356 977.82
Global Count Rates
    Source only 599.580 3,951.868
    Background (sky+dark) 113,910.262 750,789.02
Background per unit area
    Sky Background (arcsec-2) 33.053 217.856
    Dark Current (arcsec-2) 10.400 68.547
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 0.23
Effective Wavelength 5747.40 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: Non-stellar Objects QSO (SDSS based) [800, 8554.5 Å z=0]
Extinction E(B-V): None
Normalization: Renormalized to abmag = 19.2 in filter Sloan/R
Redshift: z=0.71
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2