Betelgeuse is the brightest near-IR source in the sky with a J band
magnitude of −2.99.[1] The next brightest stars in the J band are
Antares (−2.7),
R Doradus (−2.6),
Arcturus (−2.2), and
Aldebaran (−2.1).[2] In the J band
Sirius is the 9th brightest star.
The J band is a frequent source of ground based observations since the wavelengths it covers pass through
clouds and other
atmospheric gasses.[3] The waveband does however suffer from contamination by
water vapor lines and
hydroxide emission lines leading to relatively high photometric error.[4]
^Simons, D. A.; Tokunaga, A. T. (February 2002). "The Mauna Kea Observatories Near-Infrared Filter Set. I: Defining Optimal 1-5 $\mu$m Bandpasses". Publications of the Astronomical Society of the Pacific. 114 (792): 169–179.
arXiv:astro-ph/0110594.
doi:
10.1086/338544.
ISSN0004-6280.
S2CID7880289.