ETC Request ID: STIS.ta.1165891

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.5352 seconds

gives: Time to Saturation (for a single exposure) = 68.29 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 3,899.621 2,086.96 45.68
    Background 0.227 0.12 0.35
        Sky 0.002 8.37e-04 0.03
        Dark Current 0.225 0.12 0.35
    Read Out 25.20
Total in selected region 3,899.847 2,087.08 52.17
Brightest Pixel (single exposure) 1,757.237 940.42
Global Count Rates
    Source only 7,799.242 4,173.914
    Background (sky+dark) 26,257.865 14,052.40
Background per unit area
    Sky Background (arcsec-2) 0.070 0.037
    Dark Current (arcsec-2) 10.000 5.352
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 6067.20 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 A3V 8750 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 9.41 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1