ETC Request ID: STIS.sp.1186000
Exposure time (seconds) = 1,428.0000 at wavelength 2132.00 Å
gives: SNR = 48.7461 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 51.2947 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 | 0.905 | 2,585.71 | 50.85 |
| Background | 0.011 | 29.99 | 5.48 |
| Sky | 5.952e-10 | 1.70e-06 | 1.30e-03 |
| Dark Current | 0.011 | 29.99 | 5.48 |
| Total in selected region | 0.916 | 2,615.70 | 53.04 |
| Brightest Pixel (single exposure) (at 2353.76 Å) | 0.397 | 566.83 | |
| Count rate entire detector | 38,990.403 | ||
| Buffer Time (sec) | 51.29 | ||
| 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 | 27,553.407 | 39,346,265.783 | |
| Background (sky+dark) | 1,572.864 | 2,246,049.83 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2263 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 0.2X0.2 |
| Target: [point source] | |
| Spectrum: | Standard HST Star Spectra BD+28°4211 (Op, 10.51) [1140.6, 10242.7 Å] |
| 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 26.1
