ETC Request ID: STIS.ta.824692

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0534 seconds

gives: Time to Saturation (for a single exposure) = 7.67 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0534465 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 39,222.808 2,096.32 45.79
    Background 0.608 0.03 0.18
        Sky 0.437 0.02 0.15
        Dark Current 0.171 9.14e-03 0.10
    Read Out 25.50
Total in selected region 39,223.416 2,096.35 52.41
Brightest Pixel (single exposure) 15,649.304 836.40
Global Count Rates
    Source only 78,445.616 4,192.645
    Background (sky+dark) 47,758.524 2,552.53
Background per unit area
    Sky Background (arcsec-2) 19.417 1.038
    Dark Current (arcsec-2) 7.600 0.406
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 6903.01 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 B0V 30000 4.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.24 applied before normalization
Normalization: Renormalized to vegamag = 12.71 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 24.2