Infrared Astronomy
In infrared astronomy, the J band refers to an atmospheric transmission window centred on 1.25 micrometres (in the near-infrared). Betelgeuse is the brightest near-IR source in the sky with a J band magnitude of -2.99. The next brightest stars in the J band are R Doradus (-2.6), Arcturus (-2.2), and Aldebaran (-2.1). In the J band Sirius is the 9th brightest star.
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