ETC Request ID: STIS.sp.1368401
Requested Signal/Noise Ratio = 20.000 at wavelength 2483.00 Å (per resolution element)
gives: Time = 840.8601 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 | 0.262 | 441.27 | 21.01 |
| Background | 0.014 | 23.54 | 4.85 |
| Sky | 5.989e-10 | 1.01e-06 | 1.00e-03 |
| Dark Current | 0.014 | 23.54 | 4.85 |
| Total in selected region | 0.276 | 464.81 | 22.06 |
| Brightest Pixel (single exposure) (at 2581.69 Å) | 0.119 | 100.35 | |
| Count rate entire detector | 10,283.973 | ||
| Buffer Time (sec) | 194.48 | ||
| 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 | 6,426.079 | 5,403,433.594 | |
| Background (sky+dark) | 2,097.153 | 1,763,412.60 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2463 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 0.2X0.09 |
| Target: [point source] | |
| Spectrum: | Castelli-Kurucz Models A3V 8750 4.0 |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.03 applied before normalization |
| Normalization: | Renormalized to vegamag = 8.22 in filter Johnson/U |
| 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 27.2
