ETC Request ID: STIS.ta.1364758

Requested Signal/Noise Ratio = 40.000

gives: Time = 3.2164 seconds

gives: Time to Saturation (for a single exposure) = 326.72 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 648.970 2,087.35 45.69
    Background 0.235 0.76 0.87
        Sky 0.001 3.39e-03 0.06
        Dark Current 0.234 0.75 0.87
    Read Out 25.20
Total in selected region 649.205 2,088.11 52.18
Brightest Pixel (single exposure) 367.290 1,181.35
Global Count Rates
    Source only 1,297.940 4,174.703
    Background (sky+dark) 27,330.034 87,904.52
Background per unit area
    Sky Background (arcsec-2) 0.047 0.150
    Dark Current (arcsec-2) 10.400 33.451
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 0.28
Effective Wavelength 3737.81 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50OII
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Kurucz Models O5V 44500 5.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.478 applied before normalization
Normalization: Renormalized to abmag = 12.67 in filter Sloan/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2