PHARO contains 4 wheels that carry slits, pupil masks, filters, and grisms. The elements currently installed in each wheel are listed in the following tables. Updated 08/09/2011 C. Heffner.
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Filter Wheel | |||||||
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# | Filter | Central Wavelength* (microns) | Bandpass (microns) | Half Power Wavelengths* (microns) | Transmission | Sensitivity | Manufacturer |
1 | Open | . | . | . | . | . | . |
2 | J | 1.246 | 0.162 | 1.165 - 1.327 | 87.3% | . | OCLI |
3 | H | 1.635 | 0.296 | 1.487 - 1.783 | 84.9% | . | OCLI |
4 | K | 2.196 | 0.336 | 2.028 - 2.364 | 90.4% | . | OCLI |
5 | K S | 2.145 | 0.310 | 1.990 - 2.300 | 91.8% | . | OCLI |
6 | Methane Short | 1.570 | 0.100 | 1.520 - 1.620 |   | . | NDC |
7 | Methane Long | 1.690 | 0.100 | 1.640 - 1.740 |   | . | NDC |
8 | Br Gamma | 2.18 | 0.03 | 2.165 - 2.195 |   | . | NDC |
9 | - | - | - | - | - | . | - |
10 | Kcont | 2.29 | 0.035 | 2.272 - 2.307 |   | . | NDC |
Grism Wheel | |||||||
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# | Filter | Central Wavelength* (microns) | Bandpass (microns) | 5% Power Wavelengths* (microns) | Transmission | Sensitivity | Manufacturer |
1 | ND 1% | . | . | . | 1% | . | JANOS |
2 | H Grism | See table below for specs on Grisms | |||||
3 | Open | . | . | . | . | . | . |
4 | K Grism | See table below for specs on Grisms | |||||
5 | Fe II | 1.648 | 0.025 | 1.638 - 1.662 | . | . | NDC |
6 | H Continuum | 1.668 | 0.018 | 1.651 - 1.669 | . | . | NDC |
7 | H & K Grism + Blocking Filter | . | . | . | . | . | G. Serabyn |
8 | H2 | 2.124 | 0.007 | 2.121 - 2.128 | 80.1% | . | Barr |
9 | J Grism | See table below for specs on Grisms | |||||
10 | ND 0.1% | . | . | . | 0.1% | . | JANOS |
Grisms | |||||
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# | Filter | Wavelength Range* (microns) | Dispersion (nm/pixel) | Comment | |
2 | H Grism | 1.49 - 1.78 | 0.28467 | . | |
4 | K Grism | 2.03 - 2.37 | 0.33215 | . | |
7 | H&K Grism | 1.49 - 2.37 | ? | G.Serabyn | .|
9 | J Grism | 1.17 - 1.33 | 0.15771 | . |
For more information about specific manufacturers, visit the OCLI , JANOS , and BARR home pages.