ETC Request ID: STIS.ta.1398605

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.4237 seconds

gives: Time to Saturation (for a single exposure) = 12.14 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 25,111.262 10,640.48 103.15
    Background 0.675 0.29 0.53
        Sky 0.432 0.18 0.43
        Dark Current 0.243 0.10 0.32
    Read Out 26.10
Total in selected region 25,111.937 10,640.76 106.40
Brightest Pixel (single exposure) 9,883.431 4,187.94
Global Count Rates
    Source only 50,222.524 21,280.951
    Background (sky+dark) 55,864.519 23,671.65
Background per unit area
    Sky Background (arcsec-2) 19.219 8.144
    Dark Current (arcsec-2) 10.800 4.576
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 6978.02 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) = 0.4 applied before normalization
Normalization: Renormalized to vegamag = 11.932 in filter WFC3/UVIS1/F275W
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 28.1