ETC Request ID: STIS.ta.1368232

Requested Signal/Noise Ratio = 100.000

gives: Time = 3.6183 seconds

gives: Time to Saturation (for a single exposure) = 101.66 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 2,929.943 10,601.30 102.96
    Background 0.666 2.41 1.55
        Sky 0.432 1.56 1.25
        Dark Current 0.234 0.85 0.92
    Read Out 25.20
Total in selected region 2,930.609 10,603.71 106.01
Brightest Pixel (single exposure) 1,180.405 4,271.01
Global Count Rates
    Source only 5,859.885 21,202.592
    Background (sky+dark) 54,817.750 198,344.90
Background per unit area
    Sky Background (arcsec-2) 19.221 69.545
    Dark Current (arcsec-2) 10.400 37.630
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 6849.29 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 O5V 41000 4.5
Extinction E(B-V): LMC Diffuse (Rv=3.41) = 0.15 applied before normalization
Normalization: Renormalized to vegamag = 13.244 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