ETC Request ID: STIS.ta.827808
Requested Signal/Noise Ratio = 40.000
gives: Time = 0.0680 seconds
gives: Time to Saturation (for a single exposure) = 9.62 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Result of the calculation 0.0680176 is less than the minimum exposure time for this detector (0.1)
| Detailed Information | Count rate | Total counts | Associated noise |
| (e-/s) | (e-) | (e-) | |
| Counts (box of 3 x 3 pixels) | |||
| Source | 30,820.684 | 2,096.35 | 45.79 |
| Background | 1.118 | 0.08 | 0.28 |
| Sky | 0.947 | 0.06 | 0.25 |
| Dark Current | 0.171 | 0.01 | 0.11 |
| Read Out | 25.50 | ||
| Total in selected region | 30,821.803 | 2,096.43 | 52.41 |
| Brightest Pixel (single exposure) | 12,471.891 | 848.31 | |
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| Global Count Rates | |||
| Source only | 61,641.369 | 4,192.699 | |
| Background (sky+dark) | 80,290.581 | 5,461.17 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 42.109 | 2.864 | |
| Dark Current (arcsec-2) | 7.600 | 0.517 | |
| 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 | 6824.23 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: | User uploaded spectrum: WD2149+021.etc |
| Extinction E(B-V): | None |
| Normalization: | None |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 24.2
