ETC Request ID: STIS.ta.1038510

Exposure time (seconds) = 4.0000

gives: SNR = 67.9920

gives: Time to Saturation (for a single exposure) = 232.83 seconds


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 1,291.281 5,165.13 71.87
    Background 0.162 0.65 0.81
        Sky 8.945e-06 3.58e-05 5.98e-03
        Dark Current 0.162 0.65 0.80
    Read Out 24.60
Total in selected region 1,291.443 5,165.77 75.97
Brightest Pixel (single exposure) 515.387 2,061.55
Global Count Rates
    Source only 2,582.563 10,330.250
    Background (sky+dark) 18,874.616 75,498.47
Background per unit area
    Sky Background (arcsec-2) 3.975e-04 0.002
    Dark Current (arcsec-2) 7.200 28.800
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 6901.19 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND5
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models B3V 19000 4.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.48 applied before normalization
Normalization: Renormalized to vegamag = 5.02 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2