ETC Request ID: STIS.sp.1314364

Exposure time (seconds) = 60.0000 at wavelength 6562.60 Å

gives: SNR = 872.9913 (per resolution element)

gives: Time to Saturation (for a single exposure) = 41.43 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (0.52) 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."

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.


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 6,375.730 765,087.65 874.69
    Background 0.183 21.92 4.68
        Sky 6.761e-04 0.08 0.28
        Dark Current 0.182 21.84 4.67
    Read Out 54.44
Total in selected region 6,375.913 765,109.57 876.40
Brightest Pixel (single exposure) (at 6562.85 Å) 2,896.330 57,926.60
Global Count Rates
    Source only 26,685.874 1,601,152.429
    Background (sky+dark) 27,373.088 1,642,385.28
Encircled energy fraction 0.91

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength: 6581
Grating: [G750M] R ~ 5000
Aperture: 52X0.5
Gain: 4.0
# Frames: 3
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: User uploaded spectrum: o6ci30010.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 27.1