ETC Request ID: STIS.ta.1013682
Requested Signal/Noise Ratio = 40.000
gives: Time = 0.0449 seconds
gives: Time to Saturation (for a single exposure) = 7.98 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Result of the calculation 0.0449105 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 | 46,051.044 | 2,068.17 | 45.48 |
| Background | 0.164 | 7.35e-03 | 0.09 |
| Sky | 0.002 | 7.04e-05 | 8.39e-03 |
| Dark Current | 0.162 | 7.28e-03 | 0.09 |
| Read Out | 24.60 | ||
| Total in selected region | 46,051.207 | 2,068.18 | 51.70 |
| Brightest Pixel (single exposure) | 15,044.318 | 675.65 | |
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| Global Count Rates | |||
| Source only | 92,102.088 | 4,136.350 | |
| Background (sky+dark) | 18,917.910 | 849.61 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 0.070 | 0.003 | |
| Dark Current (arcsec-2) | 7.200 | 0.323 | |
| 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 | 0.16 | ||
| Effective Wavelength | 7896.12 Å | ||
| Instrument name: | STIS |
| Mode: | Target Acquisition |
| Detector: | CCD |
| Acquisition Mode: | ACQ |
| Aperture: | F25ND3 |
| Gain: | 4.0 |
| # Frames: | 1 |
| Binning: | 1 |
| Dark: | medium |
| Target: [point source] | |
| Spectrum: | Castelli-Kurucz Models M2V 3500 4.5 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to vegamag = 10.03 in filter Johnson/U |
| Redshift: | None |
| Emission Lines: | |
| Line at | Center 1215.14 Å FWHM 0.5 Å Flux 4.1e-12 Fλ |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 25.2
