ETC Request ID: STIS.ta.1383618

Exposure time (seconds) = 45.0000

gives: SNR = 77.7710

gives: Time to Saturation (for a single exposure) = 2,300.01 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 147.843 6,652.92 81.57
    Background 0.666 29.99 5.48
        Sky 0.432 19.46 4.41
        Dark Current 0.234 10.53 3.24
    Read Out 25.20
Total in selected region 148.509 6,682.91 85.55
Brightest Pixel (single exposure) 52.174 2,347.82
Global Count Rates
    Source only 295.685 13,305.840
    Background (sky+dark) 54,817.750 2,466,798.75
Background per unit area
    Sky Background (arcsec-2) 19.221 864.931
    Dark Current (arcsec-2) 10.400 468.000
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 0.18
Effective Wavelength 7548.66 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 Elliptical Galaxy model 2
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.0404 applied before normalization
Normalization: Renormalized to abmag = 19.4 in filter Sloan/R
Redshift: z=0.071
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 27.2