ETC Request ID: STIS.ta.827673

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0671 seconds

gives: Time to Saturation (for a single exposure) = 2.05 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0671038 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.


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 32 x 32 pixels)
    Source 174,497.789 11,709.47 108.21
    Background 19.856 1.33 1.15
        Sky 0.400 0.03 0.16
        Dark Current 19.456 1.31 1.14
    Read Out 272.00
Total in selected region 174,517.645 11,710.80 292.74
Brightest Pixel (single exposure) 58,543.239 3,928.48
Global Count Rates
    Source only 221,248.660 14,846.632
    Background (sky+dark) 19,923.344 1,336.93
Background per unit area
    Sky Background (arcsec-2) 33.330 2.237
    Dark Current (arcsec-2) 7.600 0.510
Extraction region
box of 32 x 32 pixels
    Effective Sky Area (pixels) 4.80
    Fraction of flux 0.97
    Fraction of flux in brightest pixel 0.26
Effective Wavelength 2750.56 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ/PEAK
Aperture: 0.2X0.06
Gain: 4.0
# Frames: 1
Binning: 1
Dark:


Target: [point source]
Spectrum: User uploaded spectrum: v652.phi011.dat
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 24.2