ETC Request ID: STIS.ta.1368211

Requested Signal/Noise Ratio = 100.000

gives: Time = 3.6031 seconds

gives: Time to Saturation (for a single exposure) = 100.38 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 2,942.256 10,601.29 102.96
    Background 0.666 2.40 1.55
        Sky 0.432 1.56 1.25
        Dark Current 0.234 0.84 0.92
    Read Out 25.20
Total in selected region 2,942.923 10,603.69 106.01
Brightest Pixel (single exposure) 1,195.476 4,307.44
Global Count Rates
    Source only 5,884.512 21,202.574
    Background (sky+dark) 54,817.750 197,514.64
Background per unit area
    Sky Background (arcsec-2) 19.221 69.254
    Dark Current (arcsec-2) 10.400 37.472
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 0.20
Effective Wavelength 6801.56 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50LP
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models O3V 45000 4.5
Extinction E(B-V): SMC Bar (Rv=2.74) = 0.04 applied before normalization
Normalization: Renormalized to vegamag = 13.93 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2