ETC Request ID: STIS.ta.1003611
Requested Signal/Noise Ratio = 40.000
gives: Time = 0.0152 seconds
gives: Time to Saturation (for a single exposure) = 2.41 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Result of the calculation 0.0152261 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 | 135,830.848 | 2,068.18 | 45.48 |
| Background | 0.597 | 9.09e-03 | 0.10 |
| Sky | 0.435 | 6.62e-03 | 0.08 |
| Dark Current | 0.162 | 2.47e-03 | 0.05 |
| Read Out | 24.60 | ||
| Total in selected region | 135,831.445 | 2,068.19 | 51.70 |
| Brightest Pixel (single exposure) | 49,881.257 | 759.50 | |
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| Global Count Rates | |||
| Source only | 271,661.697 | 4,136.352 | |
| Background (sky+dark) | 46,585.728 | 709.32 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 19.330 | 0.294 | |
| Dark Current (arcsec-2) | 7.200 | 0.110 | |
| 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 | 7344.02 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: | Kurucz Models K4V 4560 4.5 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to vegamag = 12.2 in filter Johnson/V |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 25.2
