ETC Request ID: STIS.ta.1368237

Requested Signal/Noise Ratio = 100.000

gives: Time = 1.0567 seconds

gives: Time to Saturation (for a single exposure) = 29.81 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 10,031.334 10,599.77 102.96
    Background 0.666 0.70 0.84
        Sky 0.432 0.46 0.68
        Dark Current 0.234 0.25 0.50
    Read Out 25.20
Total in selected region 10,032.000 10,600.48 106.00
Brightest Pixel (single exposure) 4,025.404 4,253.51
Global Count Rates
    Source only 20,062.667 21,199.543
    Background (sky+dark) 54,817.750 57,924.07
Background per unit area
    Sky Background (arcsec-2) 19.221 20.310
    Dark Current (arcsec-2) 10.400 10.989
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 6871.17 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): LMC Diffuse (Rv=3.41) = 0.2 applied before normalization
Normalization: Renormalized to vegamag = 12.08 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