ETC Request ID: STIS.ta.1301957

Requested Signal/Noise Ratio = 40.000

gives: Time = 1.7535 seconds

gives: Time to Saturation (for a single exposure) = 223.19 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 1,190.291 2,087.13 45.69
    Background 0.225 0.39 0.63
        Sky 8.928e-06 1.57e-05 3.96e-03
        Dark Current 0.225 0.39 0.63
    Read Out 25.20
Total in selected region 1,190.516 2,087.52 52.18
Brightest Pixel (single exposure) 537.655 942.76
Global Count Rates
    Source only 2,380.582 4,174.253
    Background (sky+dark) 26,214.648 45,966.32
Background per unit area
    Sky Background (arcsec-2) 3.968e-04 6.957e-04
    Dark Current (arcsec-2) 10.000 17.535
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 6046.75 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: Castelli-Kurucz Models B3V 19000 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 4.93 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.2