... Explanation : Comet Hale-Bopp continues its slow trek across the night sky, and can now be seen superposed near the bright globular cluster M14 . ...
... Luckman Four-Star Winner . Congratulations! It's not every day that stars fall out of the sky. In fact, that kind of thing is bound to hurt someone. ...
... different positions are then subtracted to remove sky lines and thermal background ... slit, spectra off-source must be observed to adequately sample the sky background ...
... Assuming a source (extended or seeing--broadened point--like) with an intrinsic flux level per pixel much lower than the sky flux, the typical observing procedure consists of a group of exposures on the source itself, interleaved by exposures on blank sky ...
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Ссылки http://www.arcetri.astro.it/science/irlab/doc/arnica_sait_93.ps -- 109.0 Кб -- 28.07.2005 Похожие документы
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