ETC Request ID: STIS.ta.1288940

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0265 seconds

gives: Time to Saturation (for a single exposure) = 4.68 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0265395 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 78,633.408 2,086.89 45.68
    Background 0.659 0.02 0.13
        Sky 0.434 0.01 0.11
        Dark Current 0.225 5.97e-03 0.08
    Read Out 25.20
Total in selected region 78,634.067 2,086.91 52.17
Brightest Pixel (single exposure) 25,627.463 680.14
Global Count Rates
    Source only 157,266.815 4,173.785
    Background (sky+dark) 53,877.858 1,429.89
Background per unit area
    Sky Background (arcsec-2) 19.296 0.512
    Dark Current (arcsec-2) 10.000 0.265
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 7906.63 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_M2.5.csv
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 13.54 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