ETC Request ID: STIS.ta.712465

Exposure time (seconds) = 4.0000

gives: SNR = 127.1989

gives: Time to Saturation (for a single exposure) = 70.46 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 4,201.961 16,807.84 129.65
    Background 0.611 2.44 1.56
        Sky 0.440 1.76 1.33
        Dark Current 0.171 0.68 0.83
    Read Out 25.50
Total in selected region 4,202.571 16,810.28 132.14
Brightest Pixel (single exposure) 1,703.090 6,812.36
Global Count Rates
    Source only 8,403.921 33,615.685
    Background (sky+dark) 47,928.993 191,715.97
Background per unit area
    Sky Background (arcsec-2) 19.535 78.142
    Dark Current (arcsec-2) 7.600 30.400
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 0.20
Effective Wavelength 6815.38 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50LP
Gain: 4.0
# Frames: 1
Binning: 1
Dark:


Target: [point source]
Spectrum: Standard HST Star Spectra Grw+70°5824 (DA3, 12.77) [1140.56, 24976.7 Å]
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 15.0 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 23.1