ETC Request ID: STIS.ta.1005300
Exposure time (seconds) = 0.5000
gives: SNR = 287.7648
gives: Time to Saturation (for a single exposure) = 2.00 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 | 166,819.365 | 83,409.68 | 288.81 |
| Background | 0.597 | 0.30 | 0.55 |
| Sky | 0.435 | 0.22 | 0.47 |
| Dark Current | 0.162 | 0.08 | 0.28 |
| Read Out | 24.60 | ||
| Total in selected region | 166,819.962 | 83,409.98 | 289.85 |
| Brightest Pixel (single exposure) | 59,946.060 | 29,973.03 | |
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| Global Count Rates | |||
| Source only | 333,638.730 | 166,819.365 | |
| Background (sky+dark) | 46,585.728 | 23,292.86 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 19.330 | 9.665 | |
| Dark Current (arcsec-2) | 7.200 | 3.600 | |
| 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 | 0.18 | ||
| Effective Wavelength | 7453.52 Å | ||
| Instrument name: | STIS |
| Mode: | Target Acquisition |
| Detector: | CCD |
| Acquisition Mode: | ACQ |
| Aperture: | F28X50LP |
| Gain: | 4.0 |
| # Frames: | 1 |
| Binning: | 1 |
| Dark: | medium |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: gmaur_HSTv4_.txt |
| Extinction E(B-V): | None |
| Normalization: | None |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 25.2
