ETC Request ID: STIS.ta.1371732

Exposure time (seconds) = 0.5000

gives: SNR = 128.4927

gives: Time to Saturation (for a single exposure) = 8.75 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 34,246.019 17,123.01 130.85
    Background 0.666 0.33 0.58
        Sky 0.432 0.22 0.47
        Dark Current 0.234 0.12 0.34
    Read Out 25.20
Total in selected region 34,246.685 17,123.34 133.26
Brightest Pixel (single exposure) 13,718.563 6,859.28
Global Count Rates
    Source only 68,492.038 34,246.019
    Background (sky+dark) 54,817.750 27,408.87
Background per unit area
    Sky Background (arcsec-2) 19.221 9.610
    Dark Current (arcsec-2) 10.400 5.200
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 6880.74 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50LP
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models O3V 45000 4.5
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.2 applied before normalization
Normalization: Renormalized to vegamag = 12.8 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2