ETC Request ID: STIS.sp.1034782

Exposure time (seconds) = 368.0000 at wavelength 6500.00 Å

gives: SNR = 7,577.6590 (per resolution element)

gives: Time to Saturation (for a single exposure) = 3.30 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: CCD Full Well limits: total counts per native pixel 1.33776e+07 exceeds bright limit 120000 for selected gain

WARNING MESSAGE: "Electrons per pixel due to background (7.1) 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 78,018.970 57,421,961.89 7,577.73
    Background 0.141 104.09 10.20
        Sky 0.015 11.35 3.37
        Dark Current 0.126 92.74 9.63
    Read Out 30.68
Total in selected region 78,019.111 57,422,065.98 7,577.80
Brightest Pixel (single exposure) (at 5828.90 Å) 36,352.078 13,377,564.70
Global Count Rates
    Source only 52,661,393.070 19,379,392,649.888
    Background (sky+dark) 20,299.709 7,470,292.96
Encircled energy fraction 0.91

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G750L] R ~ 500
Aperture: 52X2
Gain: 4.0
# Frames: 1
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: Kurucz Models G8V 5570 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 5.4 in filter Cousins/R
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