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What is the difference between specClass and objType for spectroscopic objects, and which one should I use?

April 26, 2017difference objects spectroscopic

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What is the difference between specClass and objType for spectroscopic objects, and which one should I use?

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The objType parameter in SpecObj and other tables is set when the objects are targeted for spectroscopy, when the spectroscopic plates are prepared. The specClass parameter is set by the spectroscopic pipeline after the spectrum is observed. For science, you should use the specClass attribute. The objType field is included for studies of the targeting algorithm.