ETC Request ID: STIS.ta.1165887

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0921 seconds

gives: Time to Saturation (for a single exposure) = 11.76 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0921463 is less than the minimum exposure time for this detector (0.1)


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 22,647.610 2,086.89 45.68
    Background 0.227 0.02 0.14
        Sky 0.002 1.44e-04 0.01
        Dark Current 0.225 0.02 0.14
    Read Out 25.20
Total in selected region 22,647.837 2,086.92 52.17
Brightest Pixel (single exposure) 10,205.288 940.38
Global Count Rates
    Source only 45,295.221 4,173.789
    Background (sky+dark) 26,257.865 2,419.57
Background per unit area
    Sky Background (arcsec-2) 0.070 0.006
    Dark Current (arcsec-2) 10.000 0.921
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 0.23
Effective Wavelength 6067.20 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND3
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models A3V 8750 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 7.5 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1