ETC Request ID: STIS.ta.1368219

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.8278 seconds

gives: Time to Saturation (for a single exposure) = 23.28 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 12,805.201 10,599.64 102.95
    Background 0.666 0.55 0.74
        Sky 0.432 0.36 0.60
        Dark Current 0.234 0.19 0.44
    Read Out 25.20
Total in selected region 12,805.867 10,600.19 106.00
Brightest Pixel (single exposure) 5,154.575 4,266.75
Global Count Rates
    Source only 25,610.402 21,199.271
    Background (sky+dark) 54,817.750 45,375.95
Background per unit area
    Sky Background (arcsec-2) 19.221 15.910
    Dark Current (arcsec-2) 10.400 8.609
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 6853.72 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 O9V 33000 4.0
Extinction E(B-V): SMC Bar (Rv=2.74) = 0.15 applied before normalization
Normalization: Renormalized to vegamag = 12.71 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2