ETC Request ID: STIS.ta.827773

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0208 seconds

gives: Time to Saturation (for a single exposure) = 2.94 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0208135 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 100,719.324 2,096.32 45.79
    Background 1.118 0.02 0.15
        Sky 0.947 0.02 0.14
        Dark Current 0.171 3.56e-03 0.06
    Read Out 25.50
Total in selected region 100,720.443 2,096.34 52.41
Brightest Pixel (single exposure) 40,833.064 849.88
Global Count Rates
    Source only 201,438.649 4,192.634
    Background (sky+dark) 80,290.581 1,671.12
Background per unit area
    Sky Background (arcsec-2) 42.109 0.876
    Dark Current (arcsec-2) 7.600 0.158
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 6813.71 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50LP
Gain: 4.0
# Frames: 1
Binning: 1
Dark:


Target: [point source]
Spectrum: User uploaded spectrum: WD2032+248.etc
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 24.2