ETC Request ID: STIS.ta.1366543

Requested Signal/Noise Ratio = 40.000

gives: Time = 169.8658 seconds

gives: Time to Saturation (for a single exposure) = 80,865.57 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 12.689 2,155.43 46.43
    Background 0.666 113.21 10.64
        Sky 0.432 73.46 8.57
        Dark Current 0.234 39.75 6.30
    Read Out 25.20
Total in selected region 13.355 2,268.64 53.89
Brightest Pixel (single exposure) 1.484 252.07
Global Count Rates
    Source only 70.869 12,038.211
    Background (sky+dark) 54,817.750 9,311,663.21
Background per unit area
    Sky Background (arcsec-2) 19.221 3,264.938
    Dark Current (arcsec-2) 10.400 1,766.605
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
Effective Wavelength 7520.16 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50LP
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [extended source]
Source diameter (arcsec): 0.4
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Renormalized to abmag = 19.26 in filter Sloan/G
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 27.2