ETC Request ID: STIS.ta.620459
Requested Signal/Noise Ratio = 40.000
gives: Time = 0.3048 seconds
gives: Time to Saturation (for a single exposure) = 51.37 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Partial overlap between instrument throughput band and input 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 | 6,725.396 | 2,049.76 | 45.27 |
| Background | 0.593 | 0.18 | 0.43 |
| Sky | 0.440 | 0.13 | 0.37 |
| Dark Current | 0.153 | 0.05 | 0.22 |
| Read Out | 24.00 | ||
| Total in selected region | 6,725.989 | 2,049.94 | 51.24 |
| Brightest Pixel (single exposure) | 2,335.980 | 711.96 | |
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| Global Count Rates | |||
| Source only | 13,450.791 | 4,099.511 | |
| Background (sky+dark) | 45,885.240 | 13,984.83 | |
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| Background per unit area | |||
| Sky Background (arcsec-2) | 19.573 | 5.965 | |
| Dark Current (arcsec-2) | 6.800 | 2.072 | |
| 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 | 0.17 | ||
| Effective Wavelength | 7617.20 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: sn2008j-20080216.205-ui.flm |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.11 applied before normalization |
| Normalization: | Renormalized to vegamag = 16.0 in filter Johnson/V |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
These results were computed using: ETC version 22.2
