ETC Request ID: STIS.ta.820548
Requested Signal/Noise Ratio = 40.000
gives: Time = 0.0197 seconds
gives: Time to Saturation (for a single exposure) = 2.79 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Result of the calculation 0.019697 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 | 106,427.669 | 2,096.31 | 45.79 |
| Background | 0.608 | 0.01 | 0.11 |
| Sky | 0.437 | 8.61e-03 | 0.09 |
| Dark Current | 0.171 | 3.37e-03 | 0.06 |
| Read Out | 25.50 | ||
| Total in selected region | 106,428.277 | 2,096.32 | 52.41 |
| Brightest Pixel (single exposure) | 42,947.217 | 845.93 | |
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| Global Count Rates | |||
| Source only | 212,855.339 | 4,192.620 | |
| Background (sky+dark) | 47,758.524 | 940.70 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 19.417 | 0.382 | |
| Dark Current (arcsec-2) | 7.600 | 0.150 | |
| 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 | 6839.81 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: | Kurucz Models B1V 25400 3.9 |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.08 applied before normalization |
| Normalization: | Renormalized to vegamag = 11.53 in filter Johnson/V |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 24.2
