ETC Request ID: STIS.sp.823953
Requested Signal/Noise Ratio = 25.000 at wavelength 7751.00 Å (per resolution element)
gives: Time = 0.5982 seconds
gives: Time to Saturation (for a single exposure) = 67.65 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: "Electrons per pixel due to background (0.011) 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
| Detailed Information | Count rate | Total counts | Associated noise |
| (e-/s) | (e-) | (e-) | |
| Counts (box 2 pixels high) | (1 pix x pix) | (2.0 pix resel x pix) | |
| Source | 629.163 | 752.71 | 27.44 |
| Background | 0.038 | 0.05 | 0.21 |
| Sky | 1.559e-04 | 1.87e-04 | 0.01 |
| Dark Current | 0.038 | 0.05 | 0.21 |
| Read Out | 12.40 | ||
| Total in selected region | 629.202 | 752.76 | 30.11 |
| Brightest Pixel (single exposure) (at 6436.50 Å) | 487.778 | 291.78 | |
|
|
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| Global Count Rates | |||
| Source only | 5,854,298.989 | 3,501,943.091 | |
| Background (sky+dark) | 19,994.409 | 11,960.32 | |
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | CCD |
| Central Wavelength: | |
| Grating: | [G750L] R ~ 500 |
| Aperture: | 52X0.1 |
| Gain: | 1.0 |
| # Frames: | 1 |
| Binning: | dispersion: 1, spatial: 1 |
| Dark: |
| Target: [extended source] | |
| Source diameter (arcsec): | 1.0 |
| Spectrum: | Kurucz Models G2V 5860 4.4 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to abmag = 5.5 in filter Sloan/R |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 24.2
