ETC Request ID: STIS.ta.1006969

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.0817 seconds

gives: Time to Saturation (for a single exposure) = 2.04 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0816952 is less than the minimum exposure time for this detector (0.1)


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 129,412.844 10,572.41 102.82
    Background 0.164 0.01 0.12
        Sky 0.002 1.28e-04 0.01
        Dark Current 0.162 0.01 0.12
    Read Out 24.60
Total in selected region 129,413.007 10,572.42 105.72
Brightest Pixel (single exposure) 58,724.582 4,797.52
Global Count Rates
    Source only 258,825.688 21,144.816
    Background (sky+dark) 18,917.910 1,545.50
Background per unit area
    Sky Background (arcsec-2) 0.070 0.006
    Dark Current (arcsec-2) 7.200 0.588
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 6006.60 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND3
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 = 5.607 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