ETC Request ID: STIS.ta.1010209

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0619 seconds

gives: Time to Saturation (for a single exposure) = 3.23 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.061941 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 32 x 32 pixels)
    Source 182,860.425 11,326.56 106.43
    Background 23.751 1.47 1.21
        Sky 5.319 0.33 0.57
        Dark Current 18.432 1.14 1.07
    Read Out 262.40
Total in selected region 182,884.176 11,328.03 283.16
Brightest Pixel (single exposure) 37,156.574 2,301.51
Global Count Rates
    Source only 199,508.815 12,357.773
    Background (sky+dark) 19,044.573 1,179.64
Background per unit area
    Sky Background (arcsec-2) 33.243 2.059
    Dark Current (arcsec-2) 7.200 0.446
Extraction region
box of 32 x 32 pixels
    Effective Sky Area (pixels) 64.00
    Fraction of flux 0.92
    Fraction of flux in brightest pixel 0.19
Effective Wavelength 7271.12 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ/PEAK
Aperture: 52X0.1
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Black body at 3300.0K
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 12.95 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 25.2