This page (revision-8) was last changed on 07-Dec-2016 14:14 by Peter Young

This page was created on 31-Jan-2013 01:04 by Peter Young

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7 08-Apr-2013 15:51 4 KB Peter Young to previous | to last
6 01-Feb-2013 22:39 4 KB Peter Young to previous | to last
5 01-Feb-2013 22:29 4 KB Peter Young to previous | to last
4 01-Feb-2013 22:08 4 KB Peter Young to previous | to last
3 01-Feb-2013 22:01 4 KB Peter Young to previous | to last
2 01-Feb-2013 21:32 4 KB Peter Young to previous | to last
1 31-Jan-2013 01:04 3 KB Peter Young to last

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IRISTechnical...nobody
IRISTechnical

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[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
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%%(color:red;)__WARNING__%%: the information given below was obtained from notes taken by Peter Young at an IRIS meeting in January 2013, and it may not be up-to-date or accurate.
%%(color:red;)__WARNING__%%: the information given below was obtained from notes taken by Peter Young at an IRIS meeting, and it may not be up-to-date or accurate.
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IRIS will be launched on %%strike 28 April 2013/% %%strike sometime in May/% 26 June 2013. The commissioning phase will last about 30 days, and then the 30 day science plan will start.
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The slitjaw imager has a single CCD and a filter wheel. The filter wheel is used to select C II, Si IV and Mg II line core and wing (four filters). The FOV is 175" x 175". Note that images and spectra will be obtained simultaneously.
The slitjaw imager has a single CCD and a filter wheel. The filter wheel is used to select C II, Si IV and Mg II line core and wing (four filters). The FOV is 175" x 175".
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The spacecraft can roll from -90 to +90 degrees, thus allowing the slit to be pointed at any angle. The default slit position will be north-south. At certain times of year certain roll angles are not allowed based on the position of the Moon. The roll angles that are ruled out are between 60 and 90 degrees.
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Any pointing up to 4 arcmin off-limb is allowed.
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!!Pointing
!!Instrument "features"
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Any pointing up to 4 arcmin off-limb is allowed.
The guide telescope has a an offset relative to the main telescope and it varies with temperature. An offset look-up table will be used to make sure the telescope pointing is correct.
The spacecraft can roll from -90 to +90 degrees, thus allowing the slit to be pointed at any angle. The default slit position will be north-south. At certain times of year certain roll angles are not allowed based on the position of the Moon. The roll angles that are ruled out are between 60 and 90 degrees. The roll is performed by using a star tracker.
For feature tracking, the PZT mechanism (mirror tip-tilt used for rastering) will be used to track a solar feature across the field-of-view. When the feature reaches the edge of the field of view, the telescope will be re-pointed. This jump will not be completely accurate, leading to a jump in the position of the feature.
!!Instrumental features
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The guide telescope has a an offset relative to the main telescope and it varies with temperature. There is also a star tracker that is used for getting the spacecraft roll
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The slit spectra show intensity variations along the slit (due to non-uniform slit width?). Burn-in of the emission lines with time is expected.
The slit spectra show intensity variations along the slit (due to non-uniform slit width?). Burn-in of the emission lines is expected.
This page (revision-8) was last changed on 07-Dec-2016 14:14 by Peter YoungTop