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Instrument Apertures and Foci |
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Instrument Apertures and Foci |
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History
- UIST off scope in March 2003 to replace grisms and filters
- UIST off scope (cryogenic/vacuum problems) from Dec '03 until 2 April '04.
| Mode | Aperture for telescope, arcsec | |
|---|---|---|
| Imaging 0.12 | -5.77 | -1.07 |
| Imaging 0.06 | -2.59 | +0.75 |
| Spectroscopy | +6.65 | -0.75 |
| IFU | +0.69 | -1.07 |
| X-disp Spec | -- | -- |
| Polarimetry | +24.43* | +1.08* |
| Notes:
1. Use the same aperture for imaging-polarimetry and spectro-polarimetry. 2. The arcsec values are simply the mm values x -1.524 3. The first value is E-W, the second N-S, so in the rotated UIST frame the first value is along the slit (up and down, or in Y in pixels - see below) 4.The difference between apertures should be fixed (so strictly speaking we only need to measure onne, or maybe two for the two camera plate scales). Approximate offsets are: - Spectroscopy = Imaging(0.12arcsec) + 13.2, Imaging(0.12arcsec) + 2.6*Estimated values |
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| Mode | Location on array, (x,y) | |
|---|---|---|
| Spectroscopy, 1 pix slit | 506.4 | 590 |
| Spectroscopy, 2 pix slit | 505.2 | 590 |
| Spectroscopy, 4 pix slit | 502.2 | 590 |
| Spectroscopy, 5 pix slit | 501.5 | 590 |
| Spectroscopy, 7 pix slit | 507.7 | 590 |
| X-disp Spectros, 3 pix slit | 503.5 | 5412 |
| X-disp Spectros, 5 pix slit | 503.4 | 5412 |
| X-disp Spectros, 7 pix slit | 504.0 | 5412 |
| Spec-Pol, 2 pix slit | 510.6 | 7402 |
| Spect-Pol, 5 pix slit | 511.6 | 7402 |
| IFU | 499 | 540 |
| Imaging, 1024x1024 (0.12") | 480 | 480 |
| Imaging, 1024x1024 (0.06") | 480 | 480 |
| Imaging, 512x512 | 224 | 224 |
| Imaging Polarimetry | 511 | 7403 |
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Notes: | ||
| Grism | Filter used | Additional offset by TSS at telescope |
|---|---|---|
| IJ | J-spec | right 0.67 arcsec |
| Short_K | B2 | left 0.05 arcsec |
| Long_K | B2 | left 0.90 arcsec |
| KL | B2 | left 0.90 arcsec |
| Short_L | 3.4cont | left 0.10 arcsec |
| Long_L | BrA | right 0.17 arcsec |
| M | BrA | left 0.15 arcsec |
PLEASE NOTE: UPICK automatically applies the above offsets. TSSs do not have to adjust the source position after imaging acquisition in the thermal (this is why upick puts the star on a slightly different pixel than is listed earlier on this page).
UIST Focii
The plot below shows fine-focus measurements taken on QA nights. Note that not all focii are measured on a given day (so some values are missing). The dates marked "UIST off scope" indicate when the instrument was physically taken off the telescope for a period of time. Thus, after one of these periods values might be expected to change...
Pink - 0.12imaging/Spec focii; Yellow - 0.06JHK focii; Light Blue - 0.06LM focii; Purple - IFU focii; Brown - Pol focii.
Values being used at the telescope (i.e. NOT necessarily the last value measured) are given in the table below
| Mode | Focus, mm |
|---|---|
| Spectroscopy | 0.70* |
| Imaging, 0.12" | 0.70 |
| Imaging, 0.06"JHK | 0.95 |
| Imaging, 0.06"LM | 0.70 |
| IFU | 1.10 |
| Pol | 0.74* |
| Notes:
The 0.12" imaging and spectroscopy foci should be about the same. The 0.06"JHK focus should be MORE than the 0.12" focus by about 0.19mm. The 0.06"LM focus should be LESS than the 0.12" focus by about 0.03mm. The IFU focus should be MORE than the 0.12" focus by about 0.21mm The Pol focus should be MORE than the 0.12" focus by about 0.03mm *Estimated values |
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Previous Values (prior to date):
20040522
20040402
20031220
20031124
20031003
20030903
20030731
20030424
20030403
20030131
20030106