Difference: AstrometryThermoelasticDriftCorrection (3 vs. 4)

Revision 42016-12-22 - PilarEsquej

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META TOPICPARENT name="WebHome"

Astrometry correction due to a thermoelastic drift

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  We have performed a study on this effect by calculating the Z-axis offset for a set calibration observations. While fot STR2 temperatures below -15C the median offset presents a certain scatter around zero, for higher temperatures the behaviour of the Z-axis offset diverges. We have derived a linear correlation between the STR2 temperature and the Z-axis that aims at correcting the effect of such a thermoelastic drift.
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STR2temp_vs_offset.png
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STR2_vs_offset.jpg
  We have developed a script aimed at correcting the astrometry offset produced by the thermoelastic. This should be applied to improve the pointing for observations performed at the 'warm' attitude range (STR2 temperature >-15C).
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META FILEATTACHMENT attachment="STR2temp_vs_offset.png" attr="h" comment="STR2 temperature vs Z-axis offset for calibration observations" date="1480665414" name="STR2temp_vs_offset.png" path="STR2temp_vs_offset.png" size="326959" user="PilarEsquej" version="1"
 
META FILEATTACHMENT attachment="warmbetaAPE.png" attr="h" comment="Comparison of calibration observations before and after correction" date="1480670059" name="warmbetaAPE.png" path="warmbetaAPE.png" size="148359" user="PilarEsquej" version="1"
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META FILEATTACHMENT attachment="STR2_vs_offset.jpg" attr="h" comment="STR2 temperature vs Z-axis offset for calibration observations" date="1482407261" name="STR2_vs_offset.jpg" path="STR2_vs_offset.jpg" size="702710" user="PilarEsquej" version="1"
 
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