ETC Request ID: STIS.ta.1005473

Requested Signal/Noise Ratio = 50.000

gives: Time = 1.4491 seconds

gives: Time to Saturation (for a single exposure) = 145.23 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 2,072.883 3,003.85 54.81
    Background 0.162 0.23 0.48
        Sky 8.945e-06 1.30e-05 3.60e-03
        Dark Current 0.162 0.23 0.48
    Read Out 24.60
Total in selected region 2,073.045 3,004.08 60.08
Brightest Pixel (single exposure) 826.261 1,197.35
Global Count Rates
    Source only 4,145.765 6,007.698
    Background (sky+dark) 18,874.616 27,351.52
Background per unit area
    Sky Background (arcsec-2) 3.975e-04 5.761e-04
    Dark Current (arcsec-2) 7.200 10.434
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 6908.39 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 F0V 7250 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 4.45 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2