ETC Request ID: STIS.ta.1288948

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0254 seconds

gives: Time to Saturation (for a single exposure) = 4.98 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0254253 is less than the minimum exposure time for this detector (0.1)


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 82,079.204 2,086.89 45.68
    Background 0.659 0.02 0.13
        Sky 0.434 0.01 0.11
        Dark Current 0.225 5.72e-03 0.08
    Read Out 25.20
Total in selected region 82,079.863 2,086.91 52.17
Brightest Pixel (single exposure) 24,099.635 612.74
Global Count Rates
    Source only 164,158.408 4,173.784
    Background (sky+dark) 53,877.858 1,369.86
Background per unit area
    Sky Background (arcsec-2) 19.296 0.491
    Dark Current (arcsec-2) 10.000 0.254
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 0.15
Effective Wavelength 8343.06 Å

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


Target: [point source]
Spectrum: User uploaded spectrum: muscles_M4.5.csv
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 14.28 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 26.1