ETC Request ID: STIS.ta.1365452

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.0114 seconds

gives: Time to Saturation (for a single exposure) = 0.33 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0114495 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 925,733.967 10,599.15 102.95
    Background 0.236 2.70e-03 0.05
        Sky 0.002 1.78e-05 4.22e-03
        Dark Current 0.234 2.68e-03 0.05
    Read Out 25.20
Total in selected region 925,734.202 10,599.15 105.99
Brightest Pixel (single exposure) 367,436.680 4,206.95
Global Count Rates
    Source only 1,851,467.934 21,198.290
    Background (sky+dark) 27,306.262 312.64
Background per unit area
    Sky Background (arcsec-2) 0.069 7.930e-04
    Dark Current (arcsec-2) 10.400 0.119
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 6931.75 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 K0V 5250 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 3.73 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 27.2