ETC Request ID: STIS.ta.1314347

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.2662 seconds

gives: Time to Saturation (for a single exposure) = 37.91 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.


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 7,840.622 2,086.99 45.68
    Background 0.667 0.18 0.42
        Sky 0.433 0.12 0.34
        Dark Current 0.234 0.06 0.25
    Read Out 25.20
Total in selected region 7,841.289 2,087.17 52.17
Brightest Pixel (single exposure) 3,165.731 842.64
Global Count Rates
    Source only 15,681.244 4,173.984
    Background (sky+dark) 54,873.474 14,606.05
Background per unit area
    Sky Background (arcsec-2) 19.260 5.126
    Dark Current (arcsec-2) 10.400 2.768
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 6836.80 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 Planetary Nebula and Pt Source
Extinction E(B-V): None
Normalization: Flux 1.5e-15 flam at 4995.0 Å
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.1