ETC Request ID: STIS.ta.1368284

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.1084 seconds

gives: Time to Saturation (for a single exposure) = 11.02 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 19,248.037 2,086.90 45.68
    Background 0.235 0.03 0.16
        Sky 0.001 1.14e-04 0.01
        Dark Current 0.234 0.03 0.16
    Read Out 25.20
Total in selected region 19,248.272 2,086.92 52.17
Brightest Pixel (single exposure) 10,893.089 1,181.04
Global Count Rates
    Source only 38,496.074 4,173.795
    Background (sky+dark) 27,330.034 2,963.16
Background per unit area
    Sky Background (arcsec-2) 0.047 0.005
    Dark Current (arcsec-2) 10.400 1.128
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 0.28
Effective Wavelength 3741.46 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50OII
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models A3V 8750 4.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.03 applied before normalization
Normalization: Renormalized to vegamag = 8.012 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2