Fid Light Drfit
As mentioned in
Aldcroft's memo,
fid lights drift with time. We plotted here 14 fid light trends.
Two top two figures show fid light positions on ACA for ACIS I configuration, and
for ACIS S configuration. The CCD size is 1024 x 1024, and approximately 1 arcsec
per pixel. We use ACENT I/ ACENT J (unit in pixel) coordinates.
ACENT I is along with approximately -Y axis,
and ACENT J is approximately Z axis. Similar plots are shown to both HRC-I and HRC-S.
If you click a blue dot on the ACA map, it brings up two plots: ACENT I and J drift trend plots.
A blue vertical line indicates an approximate date of swapping IRU-1 to IRU-2
(DOM 1411 = Jun 1, 2003). Fitted lines are a simple linear fit, and the unit of the slope
given at the right top corner is arcsec/yr.
If you open up a trending plot from "Plot" row below the ACA maps of ACIS, the page will show
both ACIS-I and ACIS-S configuration plots for the selected Fid light. For HRC, either selections
(from a blue dot or from the Plot row) bring up a same plot.
ACIS
Please click a blue dot to open the Fid light trend plot
| ACIS I Fid Light Positions on ACA |
ACIS S Fid Light Positions on ACA |
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HRC I
Please click a blue dot to open the Fid light trend plot
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HRC I Fid Light Positions on ACA
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HRC S
Please click a blue dot to open the Fid light trend plot
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HRC S Fid Light Positions on ACA
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Last Update: 5/3/2013