ETC Request ID: STIS.sp.821971
Exposure time (seconds) = 140.0000 at wavelength 4571.00 Å
gives: SNR = 688.9704 (per resolution element)
gives: Time to Saturation (for a single exposure) = 178.07 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Total counts per binned pixel 94346.4 is within 70 percent of the CCD fullwell limit 120000
WARNING MESSAGE: "Electrons per pixel due to background (2.8) 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 7 pixels high) | (1 pix x pix) | (2.0 pix resel x pix) | |
| Source | 1,699.032 | 475,729.05 | 689.73 |
| Background | 0.142 | 39.64 | 6.30 |
| Sky | 0.009 | 2.40 | 1.55 |
| Dark Current | 0.133 | 37.24 | 6.10 |
| Read Out | 31.80 | ||
| Total in selected region | 1,699.174 | 475,768.69 | 690.49 |
| Brightest Pixel (single exposure) (at 4571.30 Å) | 673.903 | 94,346.44 | |
|
|
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| Global Count Rates | |||
| Source only | 1,140,136.428 | 159,619,099.864 | |
| Background (sky+dark) | 20,731.853 | 2,902,459.39 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | CCD |
| Central Wavelength: | |
| Grating: | [G430L] R ~ 500 |
| Aperture: | 52X2 |
| Gain: | 4.0 |
| # Frames: | 1 |
| Binning: | dispersion: 1, spatial: 1 |
| Dark: |
| Target: [point source] | |
| Spectrum: | Kurucz Models F8V 6200 4.4 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to vegamag = 9.52 in filter Johnson/V |
| 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
