ETC Request ID: STIS.sp.1014241
Exposure time (seconds) = 2,455.0000 at wavelength 2026.00 Å
gives: SNR = 62.0316 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 74.2671 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 | 0.865 | 4,244.82 | 65.15 |
| Background | 0.011 | 51.56 | 7.18 |
| Sky | 6.462e-10 | 3.17e-06 | 1.78e-03 |
| Dark Current | 0.011 | 51.55 | 7.18 |
| Total in selected region | 0.875 | 4,296.37 | 68.43 |
| Brightest Pixel (single exposure) (at 2319.51 Å) | 0.730 | 1,791.55 | |
| Count rate entire detector | 26,929.825 | ||
| Buffer Time (sec) | 74.27 | ||
| 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 | 19,966.114 | 49,016,808.741 | |
| Background (sky+dark) | 1,572.865 | 3,861,384.03 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 1978 |
| Grating: | [E230M] R ~ 30000 |
| Aperture: | 6X0.2 |
| Target: [point source] | |
| Spectrum: | Castelli-Kurucz Models B5V 15000 4.0 |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.35 applied before normalization |
| Normalization: | Renormalized to vegamag = 8.04 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
