ETC Request ID: STIS.ta.1017441
Requested Signal/Noise Ratio = 40.000
gives: Time = 0.4010 seconds
gives: Time to Saturation (for a single exposure) = 57.98 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 | 5,157.431 | 2,068.32 | 45.48 |
| Background | 0.597 | 0.24 | 0.49 |
| Sky | 0.435 | 0.17 | 0.42 |
| Dark Current | 0.162 | 0.06 | 0.25 |
| Read Out | 24.60 | ||
| Total in selected region | 5,158.028 | 2,068.56 | 51.71 |
| Brightest Pixel (single exposure) | 2,069.795 | 830.06 | |
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| Global Count Rates | |||
| Source only | 10,314.862 | 4,136.643 | |
| Background (sky+dark) | 46,585.728 | 18,682.61 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 19.330 | 7.752 | |
| Dark Current (arcsec-2) | 7.200 | 2.887 | |
| 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 | 0.20 | ||
| Effective Wavelength | 6870.69 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: WD0437+138_synth.dat |
| 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
