ETC Request ID: STIS.ta.1013562

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0049 seconds

gives: Time to Saturation (for a single exposure) = 0.21 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.00487685 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 32 x 32 pixels)
    Source 2,322,495.192 11,326.45 106.43
    Background 18.433 0.09 0.30
        Sky 0.001 6.88e-06 2.62e-03
        Dark Current 18.432 0.09 0.30
    Read Out 262.40
Total in selected region 2,322,513.626 11,326.54 283.16
Brightest Pixel (single exposure) 560,033.701 2,731.20
Global Count Rates
    Source only 2,460,007.627 11,997.077
    Background (sky+dark) 18,874.369 92.05
Background per unit area
    Sky Background (arcsec-2) 0.141 6.883e-04
    Dark Current (arcsec-2) 7.200 0.035
Extraction region
box of 32 x 32 pixels
    Effective Sky Area (pixels) 4.00
    Fraction of flux 0.94
    Fraction of flux in brightest pixel 0.23
Effective Wavelength 5977.25 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ/PEAK
Aperture: 0.2X0.05ND
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models G8V 5500 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 5.2 in filter Johnson/U
Redshift: None
Emission Lines:
Line at Center 1215.14 Å    FWHM 0.5 Å   Flux 1.9e-12 Fλ


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2