ETC Request ID: STIS.ta.1038633

Exposure time (seconds) = 0.5000

gives: SNR = 230.7307

gives: Time to Saturation (for a single exposure) = 2.39 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 107,670.324 53,835.16 232.02
    Background 0.164 0.08 0.29
        Sky 0.002 7.84e-04 0.03
        Dark Current 0.162 0.08 0.28
    Read Out 24.60
Total in selected region 107,670.487 53,835.24 233.32
Brightest Pixel (single exposure) 50,227.312 25,113.66
Global Count Rates
    Source only 215,340.647 107,670.324
    Background (sky+dark) 18,917.910 9,458.95
Background per unit area
    Sky Background (arcsec-2) 0.070 0.035
    Dark Current (arcsec-2) 7.200 3.600
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 0.23
Effective Wavelength 5763.23 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND3
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Kurucz Models O5V 44500 5.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.37 applied before normalization
Normalization: Renormalized to vegamag = 5.96 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2