ETC Request ID: STIS.ta.821776

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0574 seconds

gives: Time to Saturation (for a single exposure) = 2.27 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.057405 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 32 x 32 pixels)
    Source 203,979.637 11,709.45 108.21
    Background 19.457 1.12 1.06
        Sky 0.001 8.14e-05 9.02e-03
        Dark Current 19.456 1.12 1.06
    Read Out 272.00
Total in selected region 203,999.095 11,710.57 292.74
Brightest Pixel (single exposure) 52,859.289 3,034.39
Global Count Rates
    Source only 215,435.500 12,367.078
    Background (sky+dark) 19,922.945 1,143.68
Background per unit area
    Sky Background (arcsec-2) 0.142 0.008
    Dark Current (arcsec-2) 7.600 0.436
Extraction region
box of 32 x 32 pixels
    Effective Sky Area (pixels) 4.00
    Fraction of flux 0.95
    Fraction of flux in brightest pixel 0.25
Effective Wavelength 5299.47 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ/PEAK
Aperture: 0.2X0.05ND
Gain: 4.0
# Frames: 1
Binning: 1
Dark:


Target: [point source]
Spectrum: Kurucz Models A1V 9230 4.1
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 6.85 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 24.2