ETC Request ID: STIS.ta.1364693

Requested Signal/Noise Ratio = 40.000

gives: Time = 4.6864 seconds

gives: Time to Saturation (for a single exposure) = 475.93 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 445.453 2,087.57 45.69
    Background 0.235 1.10 1.05
        Sky 0.001 4.93e-03 0.07
        Dark Current 0.234 1.10 1.05
    Read Out 25.20
Total in selected region 445.688 2,088.67 52.19
Brightest Pixel (single exposure) 252.140 1,181.63
Global Count Rates
    Source only 890.907 4,175.132
    Background (sky+dark) 27,330.034 128,079.10
Background per unit area
    Sky Background (arcsec-2) 0.047 0.219
    Dark Current (arcsec-2) 10.400 48.738
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 3740.59 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: Castelli-Kurucz Models G0I 5500 1.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.659 applied before normalization
Normalization: Renormalized to vegamag = 12.773 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2