ETC Request ID: STIS.ta.1165605

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0174 seconds

gives: Time to Saturation (for a single exposure) = 2.19 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0173666 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 120,166.305 2,086.88 45.68
    Background 0.227 3.93e-03 0.06
        Sky 0.002 2.72e-05 5.21e-03
        Dark Current 0.225 3.91e-03 0.06
    Read Out 25.20
Total in selected region 120,166.531 2,086.89 52.17
Brightest Pixel (single exposure) 54,752.054 950.86
Global Count Rates
    Source only 240,332.609 4,173.768
    Background (sky+dark) 26,257.865 456.01
Background per unit area
    Sky Background (arcsec-2) 0.070 0.001
    Dark Current (arcsec-2) 10.000 0.174
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 5971.03 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 A0V 9500 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 5.69 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1