11.5.4 COS WAVECAL Exposure Parameters
This article lists the exposure times and current settings for the wavelength calibration lamp exposures as a function of spectral element and central wavelength. |
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Format definitions
Boldface type indicates the name of an APT parameter or a value for a parameter.
Black text indicates an important note.
Magenta text indicates available but unsupported parameters (requires prior approval from STScI).
Red text indicates restricted parameters (for STScI use only).
Brown text indicates text file parameters.
Items in brackets - <value> - are required values.
Items in square brackets - [<value>] - are optional.
Table 11.8: WAVECAL Exposure Parameters lists the exposure times and current settings for the wavelength calibration lamp exposures as a function of spectral element and central wavelength.
Table 11.8: WAVECAL Exposure Parameters
| Grating | Central Wavelength | Lamp Current Specification | Exposure Time (seconds)1 | BUFFER TIME (sec) | Flash Duration (sec) |
G130M | 1055 | MEDIUM | 142 | 510 | 142 |
1096 | MEDIUM | 52 | 180 | 52 | |
1222 | MEDIUM | 52 | 120 | 52 | |
1291 | MEDIUM | 12 | 120 | 12 | |
1300 | MEDIUM | 12 | 120 | 12 | |
1309 | MEDIUM | 12 | 120 | 12 | |
1318 | MEDIUM | 12 | 120 | 12 | |
1327 | MEDIUM | 12 | 120 | 12 | |
G160M | 1533 | MEDIUM | 12 | 120 | 12 |
1577 | MEDIUM | 12 | 120 | 12 | |
1589 | MEDIUM | 12 | 120 | 12 | |
1600 | MEDIUM | 12 | 120 | 12 | |
1611 | MEDIUM | 12 | 120 | 12 | |
1623 | MEDIUM | 12 | 120 | 12 | |
G140L | 800 | MEDIUM | 7 | 120 | 7 |
1105 | MEDIUM | 7 | 120 | 7 | |
1230 | MEDIUM | 7 | 120 | 7 | |
1280 | MEDIUM | 7 | 120 | 7 | |
G185M | 1786 | MEDIUM | 12 | 220 | 12 |
1817 | MEDIUM | 12 | 220 | 12 | |
1835 | MEDIUM | 12 | 240 | 12 | |
1850 | MEDIUM | 22 | 180 | 22 | |
1864 | MEDIUM | 32 | 180 | 32 | |
1882 | MEDIUM | 17 | 120 | 17 | |
1890 | MEDIUM | 12 | 120 | 12 | |
1900 | MEDIUM | 22 | 140 | 22 | |
1913 | MEDIUM | 17 | 140 | 17 | |
1921 | MEDIUM | 12 | 140 | 12 | |
1941 | MEDIUM | 12 | 180 | 12 | |
1953 | MEDIUM | 17 | 180 | 17 | |
1971 | MEDIUM | 17 | 180 | 17 | |
1986 | MEDIUM | 12 | 180 | 12 | |
2010 | MEDIUM | 12 | 180 | 12 | |
G225M | 2186 | MEDIUM | 7 | 120 | 7 |
2217 | MEDIUM | 12 | 120 | 12 | |
2233 | MEDIUM | 7 | 120 | 7 | |
2250 | MEDIUM | 22 | 120 | 22 | |
2268 | MEDIUM | 12 | 120 | 12 | |
2283 | MEDIUM | 12 | 120 | 12 | |
2306 | MEDIUM | 12 | 120 | 12 | |
2325 | MEDIUM | 12 | 280 | 12 | |
2339 | MEDIUM | 12 | 280 | 12 | |
2357 | MEDIUM | 12 | 240 | 12 | |
2373 | MEDIUM | 22 | 240 | 22 | |
2390 | MEDIUM | 7 | 240 | 7 | |
2410 | MEDIUM | 7 | 280 | 7 | |
G285M | 2617 | MEDIUM | 12 | 300 | 12 |
2637 | MEDIUM | 12 | 300 | 12 | |
2657 | MEDIUM | 7 | 300 | 7 | |
2676 | MEDIUM | 22 | 300 | 22 | |
26 95 | MEDIUM | 22 | 330 | 22 | |
2709 | MEDIUM | 12 | 330 | 12 | |
2719 | MEDIUM | 7 | 330 | 7 | |
2739 | MEDIUM | 7 | 430 | 7 | |
2850 | MEDIUM | 22 | 430 | 22 | |
2952 | MEDIUM | 7 | 430 | 7 | |
2979 | MEDIUM | 17 | 430 | 17 | |
2996 | MEDIUM | 17 | 140 | 17 | |
3018 | MEDIUM | 22 | 140 | 22 | |
3035 | MEDIUM | 27 | 160 | 27 | |
3057 | MEDIUM | 32 | 160 | 32 | |
3074 | MEDIUM | 32 | 160 | 32 | |
3094 | MEDIUM | 32 | 160 | 32 | |
G230L | 2635 | MEDIUM | 7 | 100 | 7 |
2950 | MEDIUM | 7 | 180 | 7 | |
3000 | MEDIUM | 7 | 180 | 7 | |
3360 | MEDIUM | 12 | 140 | 12 | |
MIRRORA | N/A | LOW | 7 | 80 | 7 |
MIRRORB | N/A | MEDIUM | 12 | 80 | 12 |
1 Based on Kenneth Sembach, "Cosmic Origins Spectrograph PtNe Wavelength Calibration Exposure Times," COS Technical Instrument Report 2006-01 (v1)
Related Links
11.5.1 COS Internal Calibration Targets
11.5.2 COS Spectral Elements and Central Wavelengths
11.5.3 COS Apertures
11.5.5 COS Coordinate System