ETC Request ID: STIS.sp.1039947
Exposure time (seconds) = 150.0000 at wavelength 2000.00 Å
gives: SNR = 2.9632 (per resolution element)
gives: Time to Saturation (for a single exposure) = 190.95 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: "Electrons per pixel due to background (1.4) is less than the recommended threshold of 20 electrons to avoid poor charge transfer efficiency (CTE). We suggest you consider CTE mitigation strategies described in the STIS Instrument Handbook."
Table of Source and Noise Counts per Pixel
| Detailed Information | Count rate | Total counts | Associated noise |
| (e-/s) | (e-) | (e-) | |
| Counts (box 2 pixels high) | (1 pix x 2 pix) | (2 pix resel x 2 pix) | |
| Source | 0.191 | 57.44 | 7.58 |
| Background | 0.036 | 10.80 | 3.29 |
| Sky | 1.307e-07 | 3.92e-05 | 6.26e-03 |
| Dark Current | 0.036 | 10.80 | 3.29 |
| Read Out | 17.54 | ||
| Total in selected region | 0.227 | 68.24 | 19.38 |
| Brightest Pixel (single exposure) (at 3037.80 Å) | 172.822 | 12,961.64 | |
|
|
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| Global Count Rates | |||
| Source only | 36,068.252 | 5,410,237.735 | |
| Background (sky+dark) | 18,925.392 | 2,838,808.75 | |
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | CCD |
| Central Wavelength: | |
| Grating: | [G230LB] R ~ 700 |
| Aperture: | 52X2 |
| Gain: | 1.0 |
| # Frames: | 2 |
| Binning: | dispersion: 1, spatial: 1 |
| Dark: | medium |
| Target: [extended source] | |
| Source diameter (arcsec): | 0.07 |
| Spectrum: | Standard HST Star Spectra Solar Spectrum (G2V, -26.75) [1195.0, 26957.4 Å] |
| Extinction E(B-V): | None |
| Normalization: | Flux 1.88e-12 flam at 2000.0 Å |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 25.2
