ETC Request ID: STIS.ta.1365730
Requested Signal/Noise Ratio = 40.000
gives: Time = 1.7836 seconds
gives: Time to Saturation (for a single exposure) = 202.65 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 | 1,170.179 | 2,087.14 | 45.69 |
| Background | 0.235 | 0.42 | 0.65 |
| Sky | 0.001 | 1.94e-03 | 0.04 |
| Dark Current | 0.234 | 0.42 | 0.65 |
| Read Out | 25.20 | ||
| Total in selected region | 1,170.414 | 2,087.56 | 52.18 |
| Brightest Pixel (single exposure) | 592.149 | 1,056.16 | |
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| Global Count Rates | |||
| Source only | 2,340.359 | 4,174.284 | |
| Background (sky+dark) | 27,332.328 | 48,750.18 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 0.048 | 0.086 | |
| Dark Current (arcsec-2) | 10.400 | 18.550 | |
| 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 | 0.25 | ||
| Effective Wavelength | 5006.77 Å | ||
| Instrument name: | STIS |
| Mode: | Target Acquisition |
| Detector: | CCD |
| Acquisition Mode: | ACQ |
| Aperture: | F28X50OIII |
| Gain: | 4.0 |
| # Frames: | 1 |
| Binning: | 1 |
| Dark: | medium |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: b0.5v.dat |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.33 applied before normalization |
| Normalization: | Renormalized to vegamag = 10.32 in filter Johnson/V |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 27.2
