ETC Request ID: STIS.ta.1368224

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.7235 seconds

gives: Time to Saturation (for a single exposure) = 20.23 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 14,651.015 10,599.57 102.95
    Background 0.666 0.48 0.69
        Sky 0.432 0.31 0.56
        Dark Current 0.234 0.17 0.41
    Read Out 25.20
Total in selected region 14,651.682 10,600.06 106.00
Brightest Pixel (single exposure) 5,932.598 4,292.06
Global Count Rates
    Source only 29,302.031 21,199.147
    Background (sky+dark) 54,817.750 39,659.01
Background per unit area
    Sky Background (arcsec-2) 19.221 13.906
    Dark Current (arcsec-2) 10.400 7.524
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 6820.52 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 O5V 41000 4.5
Extinction E(B-V): SMC Bar (Rv=2.74) = 0.08 applied before normalization
Normalization: Renormalized to vegamag = 12.313 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2