ETC Request ID: STIS.ta.1165999

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0278 seconds

gives: Time to Saturation (for a single exposure) = 3.92 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0278068 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 75,049.624 2,086.89 45.68
    Background 0.659 0.02 0.14
        Sky 0.434 0.01 0.11
        Dark Current 0.225 6.26e-03 0.08
    Read Out 25.20
Total in selected region 75,050.283 2,086.91 52.17
Brightest Pixel (single exposure) 30,576.430 850.23
Global Count Rates
    Source only 150,099.247 4,173.786
    Background (sky+dark) 53,877.858 1,498.17
Background per unit area
    Sky Background (arcsec-2) 19.296 0.537
    Dark Current (arcsec-2) 10.000 0.278
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 0.20
Effective Wavelength 6785.90 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: Standard HST Star Spectra Feige 110 (D0p, 11.83) [1148.6, 24999.5 Å]
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1