ETC Request ID: STIS.ta.824723

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0139 seconds

gives: Time to Saturation (for a single exposure) = 2.00 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.013922 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 150,574.659 2,096.31 45.79
    Background 0.608 8.46e-03 0.09
        Sky 0.437 6.08e-03 0.08
        Dark Current 0.171 2.38e-03 0.05
    Read Out 25.50
Total in selected region 150,575.267 2,096.32 52.41
Brightest Pixel (single exposure) 60,019.695 835.60
Global Count Rates
    Source only 301,149.317 4,192.615
    Background (sky+dark) 47,758.524 664.90
Background per unit area
    Sky Background (arcsec-2) 19.417 0.270
    Dark Current (arcsec-2) 7.600 0.106
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 6908.28 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 O9V 33000. 4.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.26 applied before normalization
Normalization: Renormalized to vegamag = 11.26 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 24.2