J band (infrared)

Atmospheric windows in the infrared. The J band is the transmission window centred on 1.25 micrometres

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.^[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.

References

↑ R. Cutri and M. Skrutskie (2009-09-07). "Very Bright Stars in the 2MASS Point Source Catalog (PSC)". The Two Micron All Sky Survey at IPAC. Retrieved 2011-12-28.
↑ "Simbad object query:Jmag<-2 & Vmag>-9". SIMBAD Astronomical Database. Retrieved 2012-08-22.

Electromagnetic spectrum

← higher frequencies longer wavelengths → Gamma rays X-rays Ultraviolet Visible Infrared Terahertz radiation Microwave Radio

Visible (optical)	Violet Blue Green Yellow Orange Red

Microwaves	W band V band Q band K_a band K band K_u band X band S band C band L band

Radio	EHF SHF UHF VHF HF MF LF VLF ULF SLF ELF

Wavelength types	Microwave Shortwave Medium wave Longwave

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