ETC Request ID: STIS.ta.1033545

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0266 seconds

gives: Time to Saturation (for a single exposure) = 3.78 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0265996 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 77,752.302 2,068.18 45.48
    Background 0.597 0.02 0.13
        Sky 0.435 0.01 0.11
        Dark Current 0.162 4.31e-03 0.07
    Read Out 24.60
Total in selected region 77,752.899 2,068.20 51.70
Brightest Pixel (single exposure) 31,728.320 843.96
Global Count Rates
    Source only 155,504.604 4,136.361
    Background (sky+dark) 46,585.728 1,239.16
Background per unit area
    Sky Background (arcsec-2) 19.330 0.514
    Dark Current (arcsec-2) 7.200 0.192
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 6776.83 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: Standard HST Star Spectra G191B2B (DA0, 11.781) [100.0, 400104.0 Å]
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 25.2