ETC Request ID: STIS.ta.847659

Exposure time (seconds) = 0.3000

gives: SNR = 148.9281

gives: Time to Saturation (for a single exposure) = 2.79 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 76,039.537 22,811.86 151.04
    Background 0.172 0.05 0.23
        Sky 0.001 3.16e-04 0.02
        Dark Current 0.171 0.05 0.23
    Read Out 25.50
Total in selected region 76,039.709 22,811.91 153.17
Brightest Pixel (single exposure) 43,034.289 12,910.29
Global Count Rates
    Source only 152,079.074 45,623.722
    Background (sky+dark) 19,990.111 5,997.03
Background per unit area
    Sky Background (arcsec-2) 0.047 0.014
    Dark Current (arcsec-2) 7.600 2.280
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 0.28
Effective Wavelength 3738.55 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50OII
Gain: 4.0
# Frames: 1
Binning: 1
Dark:


Target: [point source]
Spectrum: Castelli-Kurucz Models O3V 45000 4.5
Extinction E(B-V): Milky Way CCM (Rv=4.0) = 0.514 applied before normalization
Normalization: Renormalized to vegamag = 7.31 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 24.2