ETC Request ID: STIS.ta.1032422

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.0035 seconds

gives: Time to Saturation (for a single exposure) = 0.10 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.00353033 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 2,994,737.065 10,572.40 102.82
    Background 0.597 2.11e-03 0.05
        Sky 0.435 1.54e-03 0.04
        Dark Current 0.162 5.72e-04 0.02
    Read Out 24.60
Total in selected region 2,994,737.662 10,572.40 105.72
Brightest Pixel (single exposure) 1,149,498.145 4,058.10
Global Count Rates
    Source only 5,989,474.130 21,144.796
    Background (sky+dark) 46,585.728 164.46
Background per unit area
    Sky Background (arcsec-2) 19.330 0.068
    Dark Current (arcsec-2) 7.200 0.025
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 0.19
Effective Wavelength 7113.34 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: Kurucz Models F5V 6440 4.3
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.37 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