ETC Request ID: STIS.ta.1368326

Requested Signal/Noise Ratio = 100.000

gives: Time = 2.5261 seconds

gives: Time to Saturation (for a single exposure) = 68.51 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 4,196.063 10,599.67 102.95
    Background 0.234 0.59 0.77
        Sky 8.890e-06 2.25e-05 4.74e-03
        Dark Current 0.234 0.59 0.77
    Read Out 25.20
Total in selected region 4,196.297 10,600.26 106.00
Brightest Pixel (single exposure) 1,751.454 4,424.35
Global Count Rates
    Source only 8,392.126 21,199.341
    Background (sky+dark) 27,263.223 68,869.60
Background per unit area
    Sky Background (arcsec-2) 3.951e-04 9.981e-04
    Dark Current (arcsec-2) 10.400 26.271
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 0.21
Effective Wavelength 6647.25 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND5
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Kurucz Models A3V 8720 4.2
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 3.55 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2