ETC Request ID: STIS.ta.756590

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0152 seconds

gives: Time to Saturation (for a single exposure) = 2.83 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0151542 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 138,332.076 2,096.31 45.79
    Background 0.609 9.23e-03 0.10
        Sky 0.438 6.63e-03 0.08
        Dark Current 0.171 2.59e-03 0.05
    Read Out 25.50
Total in selected region 138,332.685 2,096.32 52.41
Brightest Pixel (single exposure) 42,418.398 642.82
Global Count Rates
    Source only 276,664.152 4,192.616
    Background (sky+dark) 47,816.621 724.62
Background per unit area
    Sky Background (arcsec-2) 19.457 0.295
    Dark Current (arcsec-2) 7.600 0.115
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 0.15
Effective Wavelength 8167.01 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: Pickles Models M4V 3111.72K
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 13.49 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 ???