ETC Request ID: STIS.ta.1291330

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0885 seconds

gives: Time to Saturation (for a single exposure) = 15.96 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0885136 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 23,577.362 2,086.92 45.68
    Background 0.659 0.06 0.24
        Sky 0.434 0.04 0.20
        Dark Current 0.225 0.02 0.14
    Read Out 25.20
Total in selected region 23,578.021 2,086.98 52.17
Brightest Pixel (single exposure) 7,517.951 665.44
Global Count Rates
    Source only 47,154.724 4,173.836
    Background (sky+dark) 53,877.858 4,768.92
Background per unit area
    Sky Background (arcsec-2) 19.296 1.708
    Dark Current (arcsec-2) 10.000 0.885
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 0.16
Effective Wavelength 8001.89 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_M3.5.csv
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 15.0 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