ETC Request ID: STIS.ta.1368225

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.6396 seconds

gives: Time to Saturation (for a single exposure) = 17.99 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 16,571.498 10,599.52 102.95
    Background 0.666 0.43 0.65
        Sky 0.432 0.28 0.53
        Dark Current 0.234 0.15 0.39
    Read Out 25.20
Total in selected region 16,572.164 10,599.95 106.00
Brightest Pixel (single exposure) 6,670.302 4,266.48
Global Count Rates
    Source only 33,142.995 21,199.047
    Background (sky+dark) 54,817.750 35,062.73
Background per unit area
    Sky Background (arcsec-2) 19.221 12.294
    Dark Current (arcsec-2) 10.400 6.652
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 6854.00 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): SMC Bar (Rv=2.74) = 0.16 applied before normalization
Normalization: Renormalized to vegamag = 12.363 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2