ETC Request ID: STIS.ta.1021624

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.2408 seconds

gives: Time to Saturation (for a single exposure) = 34.30 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 8,587.733 2,068.26 45.48
    Background 0.597 0.14 0.38
        Sky 0.435 0.10 0.32
        Dark Current 0.162 0.04 0.20
    Read Out 24.60
Total in selected region 8,588.330 2,068.40 51.71
Brightest Pixel (single exposure) 3,498.239 842.51
Global Count Rates
    Source only 17,175.467 4,136.522
    Background (sky+dark) 46,585.728 11,219.66
Background per unit area
    Sky Background (arcsec-2) 19.330 4.655
    Dark Current (arcsec-2) 7.200 1.734
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 6786.87 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: User uploaded spectrum: WD1844-223.etc
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 25.2