ETC Request ID: STIS.ta.998162

Exposure time (seconds) = 10.0000

gives: SNR = 223.0627

gives: Time to Saturation (for a single exposure) = 59.79 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.


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 5,036.079 50,360.79 224.41
    Background 0.597 5.97 2.44
        Sky 0.435 4.35 2.09
        Dark Current 0.162 1.62 1.27
    Read Out 24.60
Total in selected region 5,036.676 50,366.76 225.77
Brightest Pixel (single exposure) 2,006.941 20,069.41
Global Count Rates
    Source only 10,072.158 100,721.581
    Background (sky+dark) 46,585.728 465,857.28
Background per unit area
    Sky Background (arcsec-2) 19.330 193.299
    Dark Current (arcsec-2) 7.200 72.000
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 6909.73 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: User uploaded spectrum: smooth_slsn1.dat
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 14.0 in filter Johnson/U
Redshift: z=0.03
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 25.2