ETC Request ID: STIS.ta.1368217

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.7460 seconds

gives: Time to Saturation (for a single exposure) = 20.98 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 14,208.943 10,599.59 102.95
    Background 0.666 0.50 0.71
        Sky 0.432 0.32 0.57
        Dark Current 0.234 0.17 0.42
    Read Out 25.20
Total in selected region 14,209.609 10,600.08 106.00
Brightest Pixel (single exposure) 5,719.345 4,266.52
Global Count Rates
    Source only 28,417.885 21,199.173
    Background (sky+dark) 54,817.750 40,892.94
Background per unit area
    Sky Background (arcsec-2) 19.221 14.338
    Dark Current (arcsec-2) 10.400 7.758
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 = 12.53 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2