ETC Request ID: STIS.sp.1038374
Exposure time (seconds) = 2,523.0000 at wavelength 2026.00 Å
gives: SNR = 67.6346 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 55.9114 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 | 0.999 | 5,038.82 | 70.98 |
| Background | 0.011 | 52.98 | 7.28 |
| Sky | 6.367e-10 | 3.21e-06 | 1.79e-03 |
| Dark Current | 0.011 | 52.98 | 7.28 |
| Total in selected region | 1.009 | 5,091.80 | 74.50 |
| Brightest Pixel (single exposure) (at 2346.01 Å) | 1.022 | 2,578.52 | |
| Count rate entire detector | 35,770.872 | ||
| Buffer Time (sec) | 55.91 | ||
| 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 | 26,927.572 | 67,938,263.045 | |
| Background (sky+dark) | 1,572.864 | 3,968,335.97 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 1978 |
| Grating: | [E230M] R ~ 30000 |
| Aperture: | 0.2X0.2 |
| Target: [point source] | |
| Spectrum: | Kurucz Models O9V 33000. 4.0 |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.7 applied before normalization |
| Normalization: | Renormalized to vegamag = 7.22 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
