ETC Request ID: STIS.sp.1005545
Exposure time (seconds) = 200.0000 at wavelength 1854.00 Å
gives: SNR = 16.4379 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 64.5818 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 | 0.757 | 302.63 | 17.40 |
| Background | 0.011 | 4.20 | 2.05 |
| Sky | 1.669e-12 | 6.67e-10 | 2.58e-05 |
| Dark Current | 0.011 | 4.20 | 2.05 |
| Total in selected region | 0.767 | 306.83 | 18.41 |
| Brightest Pixel (single exposure) (at 1887.41 Å) | 0.393 | 78.55 | |
| Count rate entire detector | 30,968.490 | ||
| Buffer Time (sec) | 64.58 | ||
| 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 | 18,747.272 | 3,749,454.328 | |
| Background (sky+dark) | 1,572.864 | 314,572.80 | |
| Encircled energy fraction | 0.92 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 1763 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 0.1X0.03 |
| Target: [point source] | |
| Spectrum: | Castelli-Kurucz Models A5V 8250 4.0 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to vegamag = 4.45 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
