ETC Request ID: STIS.sp.1014235
Exposure time (seconds) = 1,849.0000 at wavelength 2026.00 Å
gives: SNR = 43.7883 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 98.1569 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 7 pix) | (2 pix resel x 7 pix) | |
| Source | 0.575 | 2,126.91 | 46.12 |
| Background | 0.011 | 38.83 | 6.23 |
| Sky | 5.006e-14 | 1.85e-10 | 1.36e-05 |
| Dark Current | 0.011 | 38.83 | 6.23 |
| Total in selected region | 0.586 | 2,165.74 | 48.57 |
| Brightest Pixel (single exposure) (at 2319.47 Å) | 0.577 | 1,067.04 | |
| Count rate entire detector | 20,375.543 | ||
| Buffer Time (sec) | 98.16 | ||
| 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 | 14,805.264 | 27,374,934.004 | |
| Background (sky+dark) | 1,572.864 | 2,908,225.54 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 1978 |
| Grating: | [E230M] R ~ 30000 |
| Aperture: | 0.3X0.05ND |
| Target: [point source] | |
| Spectrum: | Castelli-Kurucz Models B0V 30000 4.0 |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.1 applied before normalization |
| Normalization: | Renormalized to vegamag = 2.89 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 25.2
