ETC Request ID: STIS.ta.1003632

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0160 seconds

gives: Time to Saturation (for a single exposure) = 2.40 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0160278 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 129,036.965 2,068.18 45.48
    Background 0.597 9.57e-03 0.10
        Sky 0.435 6.97e-03 0.08
        Dark Current 0.162 2.60e-03 0.05
    Read Out 24.60
Total in selected region 129,037.562 2,068.19 51.70
Brightest Pixel (single exposure) 50,097.118 802.95
Global Count Rates
    Source only 258,073.931 4,136.353
    Background (sky+dark) 46,585.728 746.67
Background per unit area
    Sky Background (arcsec-2) 19.330 0.310
    Dark Current (arcsec-2) 7.200 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 0.19
Effective Wavelength 7052.25 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: Kurucz Models F0V 7200 4.3
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 11.67 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