Download - Source Environment Analysis 101
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Source Environment Analysis 101
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Imagine 1 bright star with faint neighbouring stars
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Star Mapper detects the bright star
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saves the read-out from the CCD in a window around the star
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Detection data used to read out from the Astrometric Field CCDs
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Higher resolution, but smaller window around the star
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However …
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We have to get the data back to Earth
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there are
many stars
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and limitedbandwidth
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the data must be compressed
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For all but the very brightest stars the windows are binned
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216 pixels becomes 18
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The Star Mapper windows
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must also be binned
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Later Gaia will see the star again
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at this later time the CCD will be at a different angle
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with respect to the star
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on average Gaia will see
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each star 85 times
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We can combine windows from the same star
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to try, to work out
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where the light is coming from
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In order to discover the bright star’s faint neighbours
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In order to discover the bright star’s faint neighbours
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