ETC Request ID: STIS.ta.1008977

Exposure time (seconds) = 20.0000

gives: SNR = 124.3508

gives: Time to Saturation (for a single exposure) = 264.23 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 802.465 16,049.31 126.69
    Background 0.163 3.26 1.81
        Sky 0.001 0.02 0.14
        Dark Current 0.162 3.24 1.80
    Read Out 24.60
Total in selected region 802.629 16,052.57 129.06
Brightest Pixel (single exposure) 454.153 9,083.07
Global Count Rates
    Source only 1,604.931 32,098.620
    Background (sky+dark) 18,941.131 378,822.62
Background per unit area
    Sky Background (arcsec-2) 0.047 0.931
    Dark Current (arcsec-2) 7.200 144.000
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 0.28
Effective Wavelength 3737.98 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: Bruzual Synthetic Stellar Spectra M2 V
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 9.31 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 25.2