ETC Request ID: STIS.ta.1038400

Exposure time (seconds) = 6.0000

gives: SNR = 62.6445

gives: Time to Saturation (for a single exposure) = 368.48 seconds


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 742.985 4,457.91 66.77
    Background 0.162 0.97 0.99
        Sky 8.945e-06 5.37e-05 7.33e-03
        Dark Current 0.162 0.97 0.99
    Read Out 24.60
Total in selected region 743.147 4,458.88 71.16
Brightest Pixel (single exposure) 325.659 1,953.95
Global Count Rates
    Source only 1,485.970 8,915.819
    Background (sky+dark) 18,874.616 113,247.70
Background per unit area
    Sky Background (arcsec-2) 3.975e-04 0.002
    Dark Current (arcsec-2) 7.200 43.200
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 0.22
Effective Wavelength 6303.09 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND5
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models B0III 29000 3.5
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.25 applied before normalization
Normalization: Renormalized to vegamag = 5.51 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2