ETC Request ID: STIS.ta.1443564

Exposure time (seconds) = 1.5000

gives: SNR = 143.6563

gives: Time to Saturation (for a single exposure) = 20.86 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 14,198.787 21,298.18 145.94
    Background 0.675 1.01 1.01
        Sky 0.432 0.65 0.81
        Dark Current 0.243 0.36 0.60
    Read Out 26.10
Total in selected region 14,199.463 21,299.19 148.26
Brightest Pixel (single exposure) 5,752.586 8,628.88
Global Count Rates
    Source only 28,397.574 42,596.361
    Background (sky+dark) 55,864.519 83,796.78
Background per unit area
    Sky Background (arcsec-2) 19.219 28.829
    Dark Current (arcsec-2) 10.800 16.200
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 6817.49 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): Milky Way Diffuse (Rv=3.1) = 0.07 applied before normalization
Normalization: Renormalized to vegamag = 13.66 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 28.2