ETC Request ID: STIS.sp.1011242

Requested Signal/Noise Ratio = 60.000 at wavelength 6564.00 Å (per resolution element)

gives: Time = 12.7654 seconds

gives: Time to Saturation (for a single exposure) = 223.69 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.

WARNING MESSAGE: "Electrons per pixel due to background (0.11) is less than the recommended threshold of 20 electrons to avoid poor charge transfer efficiency (CTE). We suggest you consider CTE mitigation strategies described in the STIS Instrument Handbook."


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box 7 pixels high) (1 pix x 7 pix) (2 pix resel x 7 pix)
    Source 175.064 4,469.52 66.85
    Background 0.126 3.22 1.79
        Sky 4.582e-05 1.17e-03 0.03
        Dark Current 0.126 3.22 1.79
    Read Out 32.81
Total in selected region 175.190 4,472.74 74.49
Brightest Pixel (single exposure) (at 6337.90 Å) 147.526 941.61
Global Count Rates
    Source only 293,581.951 3,747,690.515
    Background (sky+dark) 18,881.893 241,034.89
Encircled energy fraction 0.91

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength: 6581
Grating: [G750M] R ~ 5000
Aperture: 52X0.05
Gain: 1.0
# Frames: 2
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: User uploaded spectrum: obt801050merged.dat
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 25.2