ETC Request ID: STIS.ta.1006978

Requested Signal/Noise Ratio = 100.000

gives: Time = 0.0786 seconds

gives: Time to Saturation (for a single exposure) = 1.97 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0785953 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 134,517.064 10,572.41 102.82
    Background 0.164 0.01 0.11
        Sky 0.002 1.23e-04 0.01
        Dark Current 0.162 0.01 0.11
    Read Out 24.60
Total in selected region 134,517.228 10,572.42 105.72
Brightest Pixel (single exposure) 61,040.760 4,797.52
Global Count Rates
    Source only 269,034.129 21,144.816
    Background (sky+dark) 18,917.910 1,486.86
Background per unit area
    Sky Background (arcsec-2) 0.070 0.005
    Dark Current (arcsec-2) 7.200 0.566
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 6006.60 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: Kurucz Models A1V 9230 4.1
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 5.565 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2