ETC Request ID: STIS.sp.1014735
Exposure time (seconds) = 700.0000 at wavelength 2000.00 Å
gives: SNR = 22.9175 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 15372.6 exceeds limit for irregularly-variable sources 40 percent of the bright limit 30000 counts per second
Table of Source and Noise Counts per Pixel
| Detailed Information | Count rate | Total counts | Associated noise |
| (counts/s) | (counts) | (counts) | |
| Counts (box 2 pixels high) | (1 pix x 2 pix) | (2 pix resel x 2 pix) | |
| Source | 0.378 | 529.38 | 23.01 |
| Background | 0.003 | 4.20 | 2.05 |
| Sky | 8.101e-09 | 1.13e-05 | 3.37e-03 |
| Dark Current | 0.003 | 4.20 | 2.05 |
| Total in selected region | 0.381 | 533.58 | 23.10 |
| Brightest Pixel (single exposure) (at 2907.20 Å) | 29.696 | 20,787.14 | |
| Count rate entire detector | 15,372.585 | ||
| Buffer Time (sec) | 130.10 | ||
| For APT purposes, the recommended buffer time should be 4/5 of the buffer time calculated above. Please refer to the STIS Instrument Handbook for more details. | |||
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| Global Count Rates | |||
| Source only | 13,798.849 | 9,659,194.631 | |
| Background (sky+dark) | 1,573.735 | 1,101,614.65 | |
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | |
| Grating: | [G230L] R ~ 500 |
| Aperture: | 52X0.1 |
| Target: [extended source] | |
| Source diameter (arcsec): | 0.064 |
| Spectrum: | Standard HST Star Spectra Solar Spectrum (G2V, -26.75) [1195.0, 26957.4 Å] |
| Extinction E(B-V): | None |
| Normalization: | Flux 1.77e-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
