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K band

(atmospheric window centered around 2.2 microns, or 136 THz)

The term K band is used in communications as well as astronomy and refers to different ranges. For astronomy, it refers to an atmospheric window in the near-infrared range centered on 2.2 microns (2190nm) or 136 THz, or a photometric system band aimed at this range, e.g., with a full width at half maximum of 390nm. In addition to infrared-specific telescopes, many optical telescopes can observe in this range.

The letter is also used to indicate the magnitude of the signal observed through the filter, e.g., citing "K = 1.5".

2.2μm136THz564meVK band

Referenced by:
astronomical survey
European Southern Observatory Very Large Telescope (ESO VLT)
Gemini Observatory
Hawaii K-band Galaxy Survey
infrared (IR)
Tully-Fisher relation (TFR)