ETC Request ID: STIS.ta.1010032

Requested Signal/Noise Ratio = 40.000

gives: Time = 5.8261 seconds

gives: Time to Saturation (for a single exposure) = 820.60 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 355.087 2,068.77 45.48
    Background 0.162 0.94 0.97
        Sky 8.945e-06 5.21e-05 7.22e-03
        Dark Current 0.162 0.94 0.97
    Read Out 24.60
Total in selected region 355.249 2,069.71 51.72
Brightest Pixel (single exposure) 146.234 851.97
Global Count Rates
    Source only 710.174 4,137.531
    Background (sky+dark) 18,874.616 109,965.11
Background per unit area
    Sky Background (arcsec-2) 3.975e-04 0.002
    Dark Current (arcsec-2) 7.200 41.948
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 0.21
Effective Wavelength 6725.33 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): Milky Way Diffuse (Rv=3.1) = 0.37 applied before normalization
Normalization: Renormalized to vegamag = 6.36 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2