ETC Request ID: STIS.ta.1011194

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0112 seconds

gives: Time to Saturation (for a single exposure) = 1.37 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0112172 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 184,374.528 2,068.17 45.48
    Background 0.597 6.70e-03 0.08
        Sky 0.435 4.88e-03 0.07
        Dark Current 0.162 1.82e-03 0.04
    Read Out 24.60
Total in selected region 184,375.125 2,068.18 51.70
Brightest Pixel (single exposure) 87,844.991 985.38
Global Count Rates
    Source only 368,749.057 4,136.349
    Background (sky+dark) 46,585.728 522.56
Background per unit area
    Sky Background (arcsec-2) 19.330 0.217
    Dark Current (arcsec-2) 7.200 0.081
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 0.24
Effective Wavelength 5572.65 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 WD0947+857 (DA, 16.4) [1140.35, 5694.05 Å]
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.44 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2