ETC Request ID: STIS.ta.827019
Exposure time (seconds) = 10.0000
gives: SNR = 79.1623
gives: Time to Saturation (for a single exposure) = 463.95 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Partial overlap between instrument throughput band and target spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.
| Detailed Information | Count rate | Total counts | Associated noise |
| (e-/s) | (e-) | (e-) | |
| Counts (box of 3 x 3 pixels) | |||
| Source | 686.573 | 6,865.73 | 82.86 |
| Background | 0.608 | 6.08 | 2.47 |
| Sky | 0.437 | 4.37 | 2.09 |
| Dark Current | 0.171 | 1.71 | 1.31 |
| Read Out | 25.50 | ||
| Total in selected region | 687.181 | 6,871.81 | 86.73 |
| Brightest Pixel (single exposure) | 258.651 | 2,586.51 | |
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| Global Count Rates | |||
| Source only | 1,373.146 | 13,731.465 | |
| Background (sky+dark) | 47,758.524 | 477,585.24 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 19.417 | 194.166 | |
| Dark Current (arcsec-2) | 7.600 | 76.000 | |
| Extraction region | |||
| box of 3 x 3 pixels | |||
| Effective Sky Area (pixels) | 9.00 | ||
| Fraction of flux | 0.50 | ||
| Fraction of flux in brightest pixel | 0.19 | ||
| Effective Wavelength | 7213.48 Å | ||
| Instrument name: | STIS |
| Mode: | Target Acquisition |
| Detector: | CCD |
| Acquisition Mode: | ACQ |
| Aperture: | F28X50LP |
| Gain: | 4.0 |
| # Frames: | 1 |
| Binning: | 1 |
| Dark: |
| Target: [point source] | |
| Spectrum: | Non-stellar Objects QSO (SDSS based) [800, 8554.5 Å z=0] |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to vegamag = 17.57 in filter ACS/WFC1/F555W |
| Redshift: | z=1.67 |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 24.2
