ETC Request ID: STIS.ta.1006683

Exposure time (seconds) = 20.0000

gives: SNR = 65.1369

gives: Time to Saturation (for a single exposure) = 1,142.06 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 239.128 4,782.56 69.16
    Background 0.162 3.24 1.80
        Sky 8.945e-06 1.79e-04 0.01
        Dark Current 0.162 3.24 1.80
    Read Out 24.60
Total in selected region 239.290 4,785.80 73.42
Brightest Pixel (single exposure) 105.073 2,101.46
Global Count Rates
    Source only 478.256 9,565.116
    Background (sky+dark) 18,874.616 377,492.33
Background per unit area
    Sky Background (arcsec-2) 3.975e-04 0.008
    Dark Current (arcsec-2) 7.200 144.000
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 6283.23 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: Bruzual Synthetic Stellar Spectra B2 V
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.2 applied before normalization
Normalization: Renormalized to vegamag = 6.733 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2