ETC Request ID: STIS.ta.824676

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0833 seconds

gives: Time to Saturation (for a single exposure) = 11.86 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0833183 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 25,160.532 2,096.33 45.79
    Background 0.608 0.05 0.23
        Sky 0.437 0.04 0.19
        Dark Current 0.171 0.01 0.12
    Read Out 25.50
Total in selected region 25,161.140 2,096.38 52.41
Brightest Pixel (single exposure) 10,117.789 843.00
Global Count Rates
    Source only 50,321.063 4,192.667
    Background (sky+dark) 47,758.524 3,979.16
Background per unit area
    Sky Background (arcsec-2) 19.417 1.618
    Dark Current (arcsec-2) 7.600 0.633
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 0.20
Effective Wavelength 6859.35 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: Kurucz Models O5V 44500 5.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.18 applied before normalization
Normalization: Renormalized to vegamag = 13.13 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 24.2