ETC Request ID: STIS.ta.1368227

Requested Signal/Noise Ratio = 100.000

gives: Time = 1.1412 seconds

gives: Time to Saturation (for a single exposure) = 32.00 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 9,288.473 10,599.82 102.96
    Background 0.666 0.76 0.87
        Sky 0.432 0.49 0.70
        Dark Current 0.234 0.27 0.52
    Read Out 25.20
Total in selected region 9,289.139 10,600.58 106.00
Brightest Pixel (single exposure) 3,749.491 4,278.85
Global Count Rates
    Source only 18,576.945 21,199.644
    Background (sky+dark) 54,817.750 62,556.94
Background per unit area
    Sky Background (arcsec-2) 19.221 21.934
    Dark Current (arcsec-2) 10.400 11.868
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 6838.01 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): LMC Diffuse (Rv=3.41) = 0.12 applied before normalization
Normalization: Renormalized to vegamag = 11.989 in filter WFC3/UVIS1/F275W
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2