ETC Request ID: STIS.sp.431288
Exposure time (seconds) = 1.0000 at wavelength 1500.00 Å
gives: SNR = 7.8293 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 57403.4 exceeds bright limit 30000
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 | 30.650 | 61.30 | 7.83 |
| Background | 0.001 | 2.10e-03 | 0.05 |
| Sky | 1.400e-10 | 2.80e-10 | 1.67e-05 |
| Dark Current | 0.001 | 2.10e-03 | 0.05 |
| Total in selected region | 30.651 | 61.30 | 7.83 |
| Brightest Pixel (single exposure) (at 1265.10 Å) | 35.176 | 35.18 | |
| Count rate entire detector | 57,403.363 | ||
| Buffer Time (sec) | |||
| 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 | 56,083.095 | 56,083.095 | |
| Background (sky+dark) | 1,320.269 | 1,320.27 | |
| Encircled energy fraction | 0.84 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | FUVMAMA |
| Central Wavelength: | |
| Grating: | [G140L] R ~ 1000 |
| Aperture: | 52X2 |
| Glow region: |
| Target: [point source] | |
| Spectrum: | Standard HST Star Spectra GD153 (DA1, 13.346) |
| 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 20.2
