ETC Request ID: STIS.ta.1184754

Exposure time (seconds) = 3.0000

gives: SNR = 314.7943

gives: Time to Saturation (for a single exposure) = 8.91 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 33,242.800 99,728.40 315.80
    Background 0.659 1.98 1.41
        Sky 0.434 1.30 1.14
        Dark Current 0.225 0.68 0.82
    Read Out 25.20
Total in selected region 33,243.459 99,730.38 316.81
Brightest Pixel (single exposure) 13,465.524 40,396.57
Global Count Rates
    Source only 66,485.601 199,456.802
    Background (sky+dark) 53,877.858 161,633.57
Background per unit area
    Sky Background (arcsec-2) 19.296 57.889
    Dark Current (arcsec-2) 10.000 30.000
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 6818.56 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: Standard HST Star Spectra Grw+70°5824 (DA3, 12.77) [1140.56, 24976.7 Å]
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1