ETC Request ID: STIS.sp.1011399
Requested Signal/Noise Ratio = 50.000 at wavelength 2796.00 Å (per resolution element)
gives: Time = 1,362.0345 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 66.9665 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 | 0.953 | 2,595.19 | 50.94 |
| Background | 0.011 | 28.60 | 5.35 |
| Sky | 1.039e-09 | 2.83e-06 | 1.68e-03 |
| Dark Current | 0.011 | 28.60 | 5.35 |
| Total in selected region | 0.963 | 2,623.79 | 51.90 |
| Brightest Pixel (single exposure) (at 2653.66 Å) | 0.756 | 1,030.13 | |
| Count rate entire detector | 29,865.667 | ||
| Buffer Time (sec) | 66.97 | ||
| 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. | |||
|
|
|||
| Global Count Rates | |||
| Source only | 24,202.573 | 32,964,739.212 | |
| Background (sky+dark) | 1,572.864 | 2,142,295.05 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2713 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 0.2X0.09 |
| Target: [point source] | |
| Spectrum: | Kurucz Models F8V 6200 4.4 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to vegamag = 5.4 in filter Johnson/V |
| Redshift: | None |
| Emission Lines: | |
| Line at | Center 2796.3 Å FWHM 0.6 Å Flux 4.02e-12 Fλ |
| Selected background: | |
| Sky Background: | |
| Level: |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 25.2
