ETC Request ID: STIS.ta.827650

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0674 seconds

gives: Time to Saturation (for a single exposure) = 9.51 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0673774 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 31,113.232 2,096.33 45.79
    Background 0.608 0.04 0.20
        Sky 0.437 0.03 0.17
        Dark Current 0.171 0.01 0.11
    Read Out 25.50
Total in selected region 31,113.840 2,096.37 52.41
Brightest Pixel (single exposure) 12,618.182 850.18
Global Count Rates
    Source only 62,226.465 4,192.655
    Background (sky+dark) 47,758.524 3,217.84
Background per unit area
    Sky Background (arcsec-2) 19.417 1.308
    Dark Current (arcsec-2) 7.600 0.512
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 6811.74 Å

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


Target: [point source]
Spectrum: User uploaded spectrum: WD1337+705.etc
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 24.2