ETC Request ID: STIS.ta.1368238

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.1142 seconds

gives: Time to Saturation (for a single exposure) = 11.60 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 18,278.478 2,086.90 45.68
    Background 0.235 0.03 0.16
        Sky 0.001 1.20e-04 0.01
        Dark Current 0.234 0.03 0.16
    Read Out 25.20
Total in selected region 18,278.714 2,086.93 52.17
Brightest Pixel (single exposure) 10,344.439 1,181.05
Global Count Rates
    Source only 36,556.957 4,173.796
    Background (sky+dark) 27,330.034 3,120.34
Background per unit area
    Sky Background (arcsec-2) 0.047 0.005
    Dark Current (arcsec-2) 10.400 1.187
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 3741.39 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 A5V 8250 4.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.042 applied before normalization
Normalization: Renormalized to vegamag = 7.992 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2