ETC Request ID: STIS.ta.1368218

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.2859 seconds

gives: Time to Saturation (for a single exposure) = 7.98 seconds


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 37,076.544 10,599.31 102.95
    Background 0.666 0.19 0.44
        Sky 0.432 0.12 0.35
        Dark Current 0.234 0.07 0.26
    Read Out 25.20
Total in selected region 37,077.211 10,599.50 105.99
Brightest Pixel (single exposure) 15,029.444 4,296.57
Global Count Rates
    Source only 74,153.088 21,198.626
    Background (sky+dark) 54,817.750 15,671.11
Background per unit area
    Sky Background (arcsec-2) 19.221 5.495
    Dark Current (arcsec-2) 10.400 2.973
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 6814.44 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: Castelli-Kurucz Models O3V 45000 4.5
Extinction E(B-V): SMC Bar (Rv=2.74) = 0.07 applied before normalization
Normalization: Renormalized to vegamag = 12.37 in filter Johnson/B
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2