ETC Request ID: STIS.im.712301
Exposure time (seconds) = 30.0000
gives: SNR = 516.7768
gives: Time to Saturation (for a single exposure) = 37.63 seconds
gives: Optimum SNR = 580.3309
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Total counts per binned pixel 95665.5 is within 70 percent of the CCD fullwell limit 120000
WARNING MESSAGE: "Electrons per pixel due to background (0.57) 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."
| Detailed Information | Count rate | Total counts | Associated noise |
| (e-/s) | (e-) | (e-) | |
| Counts (circle with radius 0.194 arcsec) | |||
| Source | 9,015.444 | 270,463.32 | 520.06 |
| Background | 0.905 | 27.16 | 5.21 |
| Sky | 0.006 | 0.17 | 0.41 |
| Dark Current | 0.900 | 26.99 | 5.20 |
| Read Out | 58.49 | ||
| Total in selected region | 9,016.349 | 270,490.47 | 523.37 |
| Brightest Pixel (single exposure) | 3,188.852 | 95,665.55 | |
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| Global Count Rates | |||
| Source only | 11,269.305 | 338,079.144 | |
| Background (sky+dark) | 19,990.574 | 599,717.23 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 0.047 | 1.415 | |
| Dark Current (arcsec-2) | 7.600 | 228.000 | |
| Extraction region | |||
| circle with radius 0.194 arcsec | |||
| Effective Sky Area (pixels) | 47.35 | ||
| Fraction of flux | 0.80 | ||
| Fraction of flux in brightest pixel | 0.28 | ||
| Effective Wavelength | 3738.18 Å | ||
| Instrument name: | STIS |
| Mode: | imaging |
| Detector: | CCD |
| Aperture: | F28X50OII |
| Gain: | 4.0 |
| # Frames: | 1 |
| Binning: | 1 |
| Dark: |
| Target: [point source] | |
| Spectrum: | Kurucz Models G8V 5570 4.5 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to vegamag = 9.6 in filter WFC3/UVIS1/F336W |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 23.1
