This page (revision-10) was last changed on 07-Dec-2016 14:14 by David R Williams

This page was created on 15-Oct-2007 06:25 by David R Williams

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InterInstrumentOffsets
InterInstrumentOffsets

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At line 1 added 2 lines
[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
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The rough number that we use here is that EIS's FOV centre is 50" below SOT's centre (assuming that they don't offset internally, though perhaps this is carried through their FITS files, as ours should be).
The rough number that we use here is that EIS's FOV centre is 50 arcseconds south of SOT's centre (assuming that they don't offset internally, though perhaps this is carried through their FITS files, as ours should be). Incidentally, space-craft centre is __defined__ so that it coincides with SOT FOV centre.
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We assume that the telescope FOVs are co-centred in X.
We assume that the telescope FOVs are co-centred in the east-west direction.
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I have attached an [image taken from Hiro's slide presentation| on this subject. You can see the inter-instrument offsets. You'll see that EIS's centre is measured to be 3" west of SOT's, but the difference is so small that we assume it to be zero.
I have included an image taken from Hiro's slide presentation on this subject (larger image also attached).
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[InterInstrumentOffsets/HH_Offsets_Feb07small.png]\\\
You can see the inter-instrument offsets. Note that although EIS's centre is measured to be 3" west of SOT's, the difference is so small that we assume it to be zero.
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As you
As you can also see from the above image, XRT is centred about 43 arcseconds east of EIS, and 28 arcseconds north.
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--[Dave|DaveWilliams], 15-Oct-2007
--[Dave Williams|~DavidRWilliams], 15-Oct-2007
This page (revision-10) was last changed on 07-Dec-2016 14:14 by David R WilliamsTop