ETC Request ID: STIS.ta.1166030

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.3893 seconds

gives: Time to Saturation (for a single exposure) = 54.72 seconds

Exposure time calculation HAD WARNINGS.

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 5,360.976 2,087.04 45.68
    Background 0.659 0.26 0.51
        Sky 0.434 0.17 0.41
        Dark Current 0.225 0.09 0.30
    Read Out 25.20
Total in selected region 5,361.635 2,087.30 52.18
Brightest Pixel (single exposure) 2,192.819 853.67
Global Count Rates
    Source only 10,721.951 4,174.082
    Background (sky+dark) 53,877.858 20,974.78
Background per unit area
    Sky Background (arcsec-2) 19.296 7.512
    Dark Current (arcsec-2) 10.000 3.893
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 6763.61 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 HZ21 (DO2, 14.69) [1140.27, 10238.1 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