ETC Request ID: STIS.ta.1370801

Exposure time (seconds) = 0.5000

gives: SNR = 76.0913

gives: Time to Saturation (for a single exposure) = 23.32 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 12,735.224 6,367.61 79.80
    Background 0.666 0.33 0.58
        Sky 0.432 0.22 0.47
        Dark Current 0.234 0.12 0.34
    Read Out 25.20
Total in selected region 12,735.891 6,367.95 83.68
Brightest Pixel (single exposure) 5,146.464 2,573.23
Global Count Rates
    Source only 25,470.449 12,735.224
    Background (sky+dark) 54,817.750 27,408.87
Background per unit area
    Sky Background (arcsec-2) 19.221 9.610
    Dark Current (arcsec-2) 10.400 5.200
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 6831.85 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): Milky Way Diffuse (Rv=3.1) = 0.1 applied before normalization
Normalization: Renormalized to vegamag = 13.8 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2