ETC Request ID: STIS.sp.827417
Exposure time (seconds) = 1,500.0000 at wavelength 2026.00 Å
gives: SNR = 32.6135 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 92.2038 is less than minimum 99 seconds.
Table of Source and Noise Counts per Pixel
| Detailed Information | Count rate | Total counts | Associated noise |
| (counts/s) | (counts) | (counts) | |
| Counts (box 7 pixels high) | (1 pix x pix) | (2.0 pix resel x pix) | |
| Source | 0.394 | 1,182.32 | 34.38 |
| Background | 0.011 | 31.50 | 5.61 |
| Sky | 9.400e-12 | 2.82e-08 | 1.68e-04 |
| Dark Current | 0.011 | 31.50 | 5.61 |
| Total in selected region | 0.405 | 1,213.82 | 36.25 |
| Brightest Pixel (single exposure) (at 2224.30 Å) | 0.221 | 331.63 | |
| Count rate entire detector | 21,691.081 | ||
| Buffer Time (sec) | 92.20 | ||
| For APT purposes, the recommended buffer time should be 4/5 of the buffer time calculated above. Please refer to the STIS Instrument Handbook for more details. | |||
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| Global Count Rates | |||
| Source only | 14,157.800 | 21,236,699.694 | |
| Background (sky+dark) | 1,572.864 | 2,359,296.00 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2113 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 0.1X0.03 |
| Target: [point source] | |
| Spectrum: | Bruzual Synthetic Stellar Spectra O9 III |
| Extinction E(B-V): | None |
| Normalization: | Flux 1e-11 flam at 2026.0 Å |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Earth Shine: | Average |
| Zodiacal Light: | Average |
| Air Glow: | Average |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 24.2
