ETC Request ID: STIS.ta.1010042

Requested Signal/Noise Ratio = 40.000

gives: Time = 1.9063 seconds

gives: Time to Saturation (for a single exposure) = 255.92 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 1,085.028 2,068.37 45.48
    Background 0.162 0.31 0.56
        Sky 8.945e-06 1.71e-05 4.13e-03
        Dark Current 0.162 0.31 0.56
    Read Out 24.60
Total in selected region 1,085.190 2,068.67 51.71
Brightest Pixel (single exposure) 468.902 893.86
Global Count Rates
    Source only 2,170.056 4,136.730
    Background (sky+dark) 18,874.616 35,980.27
Background per unit area
    Sky Background (arcsec-2) 3.975e-04 7.578e-04
    Dark Current (arcsec-2) 7.200 13.725
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 6420.76 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 O7V 37000 4.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.34 applied before normalization
Normalization: Renormalized to vegamag = 5.13 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2