ETC Request ID: STIS.sp.824542
Exposure time (seconds) = 1,200.0000 at wavelength 1400.00 Å
gives: SNR = 35.3965 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Partial overlap between instrument throughput band and target spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.
WARNING MESSAGE: Buffer time 59.0539 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 | 0.613 | 1,471.86 | 38.36 |
| Background | 0.001 | 2.52 | 1.59 |
| Sky | 1.672e-18 | 4.01e-15 | 6.34e-08 |
| Dark Current | 0.001 | 2.52 | 1.59 |
| Total in selected region | 0.614 | 1,474.38 | 41.58 |
| Brightest Pixel (single exposure) (at 1309.47 Å) | 0.410 | 492.35 | |
| Count rate entire detector | 33,867.388 | ||
| Buffer Time (sec) | 59.05 | ||
| 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 | 20,307.201 | 24,368,641.453 | |
| Background (sky+dark) | 157.286 | 188,743.70 | |
| Encircled energy fraction | 0.94 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | FUVMAMA |
| Central Wavelength: | 1425 |
| Grating: | [E140M] R ~ 45800 |
| Aperture: | 0.3X0.05ND |
| Glow region: | low |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: bet_cep_for_etc.dat |
| Extinction E(B-V): | None |
| Normalization: | None |
| 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
