ETC Request ID: STIS.sp.1314362

Exposure time (seconds) = 300.0000 at wavelength 6768.00 Å

gives: SNR = 15.3938 (per resolution element)

gives: Time to Saturation (for a single exposure) = 36.61 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: CCD Full Well limits: total counts per native pixel 327738 exceeds bright limit 120000 for selected gain

WARNING MESSAGE: "Electrons per pixel due to background (2.6) 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 1.633 980.04 31.31
    Background 0.183 109.64 10.47
        Sky 7.389e-04 0.44 0.67
        Dark Current 0.182 109.20 10.45
    Read Out 54.44
Total in selected region 1.816 1,089.69 63.66
Brightest Pixel (single exposure) (at 6562.85 Å) 3,277.384 327,738.43
Global Count Rates
    Source only 25,006.608 7,501,982.296
    Background (sky+dark) 27,373.012 8,211,903.63
Encircled energy fraction 0.90

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength: 6768
Grating: [G750M] R ~ 5000
Aperture: 52X0.5
Gain: 4.0
# Frames: 3
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: Black body at 130000.0K
Extinction E(B-V): None
Normalization: Flux 2.02e-15 flam at 6510.0 Å
Redshift: None
Emission Lines:
Line at Center 6583.14 Å    FWHM 1.3 Å   Flux 1.36e-13 Fλ
Line at Center 6730.647 Å    FWHM 1.3 Å   Flux 6.84e-15 Fλ
Line at Center 6562.6 Å    FWHM 1.3 Å   Flux 1.25e-11 Fλ


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 27.1