ETC Request ID: STIS.ta.827646

Requested Signal/Noise Ratio = 40.000

gives: Time = 1.1827 seconds

gives: Time to Saturation (for a single exposure) = 135.47 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 1,772.522 2,096.43 45.79
    Background 0.173 0.20 0.45
        Sky 0.002 1.86e-03 0.04
        Dark Current 0.171 0.20 0.45
    Read Out 25.50
Total in selected region 1,772.694 2,096.63 52.41
Brightest Pixel (single exposure) 885.774 1,047.64
Global Count Rates
    Source only 3,545.043 4,192.857
    Background (sky+dark) 19,966.577 23,615.23
Background per unit area
    Sky Background (arcsec-2) 0.070 0.083
    Dark Current (arcsec-2) 7.600 8.989
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 0.25
Effective Wavelength 5127.31 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND3
Gain: 4.0
# Frames: 1
Binning: 1
Dark:


Target: [point source]
Spectrum: Kurucz Models B1V 25400 3.9
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 10.5 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 24.2