ETC Request ID: STIS.ta.1011770

Exposure time (seconds) = 25.0000

gives: SNR = 44.9708

gives: Time to Saturation (for a single exposure) = 2,597.72 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.


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 100.800 2,520.00 50.20
    Background 0.597 14.92 3.86
        Sky 0.435 10.87 3.30
        Dark Current 0.162 4.05 2.01
    Read Out 24.60
Total in selected region 101.397 2,534.93 56.04
Brightest Pixel (single exposure) 46.194 1,154.86
Global Count Rates
    Source only 201.600 5,040.005
    Background (sky+dark) 46,585.728 1,164,643.21
Background per unit area
    Sky Background (arcsec-2) 19.330 483.248
    Dark Current (arcsec-2) 7.200 180.000
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 0.23
Effective Wavelength 5933.05 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: Non-stellar Objects QSO (FOS based) [100, 3387 Å z=0]
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.051 applied before normalization
Normalization: Renormalized to abmag = 18.941 in filter Sloan/U
Redshift: z=0.871
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2