ETC Request ID: STIS.ta.1166004

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0438 seconds

gives: Time to Saturation (for a single exposure) = 4.96 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0437974 is less than the minimum exposure time for this detector (0.1)


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 47,648.681 2,086.89 45.68
    Background 0.227 9.92e-03 0.10
        Sky 0.002 6.85e-05 8.28e-03
        Dark Current 0.225 9.85e-03 0.10
    Read Out 25.20
Total in selected region 47,648.908 2,086.90 52.17
Brightest Pixel (single exposure) 24,216.902 1,060.64
Global Count Rates
    Source only 95,297.363 4,173.775
    Background (sky+dark) 26,257.865 1,150.03
Background per unit area
    Sky Background (arcsec-2) 0.070 0.003
    Dark Current (arcsec-2) 10.000 0.438
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 0.25
Effective Wavelength 4959.74 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND3
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models O9V 33000 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 6.99 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1