ETC Request ID: STIS.ta.1364779

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0444 seconds

gives: Time to Saturation (for a single exposure) = 4.51 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0444322 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 46,967.917 2,086.89 45.68
    Background 0.235 0.01 0.10
        Sky 0.001 4.68e-05 6.84e-03
        Dark Current 0.234 0.01 0.10
    Read Out 25.20
Total in selected region 46,968.152 2,086.90 52.17
Brightest Pixel (single exposure) 26,583.003 1,181.14
Global Count Rates
    Source only 93,935.834 4,173.776
    Background (sky+dark) 27,330.034 1,214.33
Background per unit area
    Sky Background (arcsec-2) 0.047 0.002
    Dark Current (arcsec-2) 10.400 0.462
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 0.28
Effective Wavelength 3740.39 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50OII
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models G0I 5500 1.0
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.128 applied before normalization
Normalization: Renormalized to vegamag = 7.7 in filter Johnson/U
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2