ETC Request ID: STIS.ta.994477

Exposure time (seconds) = 2.0000

gives: SNR = 67.9696

gives: Time to Saturation (for a single exposure) = 103.43 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 2,580.893 5,161.79 71.85
    Background 0.164 0.33 0.57
        Sky 0.002 3.13e-03 0.06
        Dark Current 0.162 0.32 0.57
    Read Out 24.60
Total in selected region 2,581.057 5,162.11 75.94
Brightest Pixel (single exposure) 1,160.194 2,320.39
Global Count Rates
    Source only 5,161.787 10,323.574
    Background (sky+dark) 18,917.877 37,835.75
Background per unit area
    Sky Background (arcsec-2) 0.070 0.139
    Dark Current (arcsec-2) 7.200 14.400
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 0.22
Effective Wavelength 6087.99 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: Castelli-Kurucz Models O9V 33000 4.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.5 applied before normalization
Normalization: Renormalized to vegamag = 10.0 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.1.1