ETC Request ID: STIS.ta.1166001

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0151 seconds

gives: Time to Saturation (for a single exposure) = 2.13 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0150831 is less than the minimum exposure time for this detector (0.1)

WARNING MESSAGE: Partial overlap between instrument throughput band and target spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 138,359.178 2,086.89 45.68
    Background 0.659 9.94e-03 0.10
        Sky 0.434 6.55e-03 0.08
        Dark Current 0.225 3.39e-03 0.06
    Read Out 25.20
Total in selected region 138,359.837 2,086.90 52.17
Brightest Pixel (single exposure) 56,294.661 849.10
Global Count Rates
    Source only 276,718.356 4,173.775
    Background (sky+dark) 53,877.858 812.65
Background per unit area
    Sky Background (arcsec-2) 19.296 0.291
    Dark Current (arcsec-2) 10.000 0.151
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 6793.43 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: Standard HST Star Spectra Feige 34 (DO,11.18) [1148.6, 10242.6 Å]
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1