ETC Request ID: STIS.ta.1368220

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.1620 seconds

gives: Time to Saturation (for a single exposure) = 4.70 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 65,419.539 10,599.24 102.95
    Background 0.666 0.11 0.33
        Sky 0.432 0.07 0.26
        Dark Current 0.234 0.04 0.19
    Read Out 25.20
Total in selected region 65,420.205 10,599.35 105.99
Brightest Pixel (single exposure) 25,537.025 4,137.50
Global Count Rates
    Source only 130,839.077 21,198.478
    Background (sky+dark) 54,817.750 8,881.54
Background per unit area
    Sky Background (arcsec-2) 19.221 3.114
    Dark Current (arcsec-2) 10.400 1.685
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 7022.82 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) = 0.5 applied before normalization
Normalization: Renormalized to vegamag = 11.853 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2