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I band

(photometric filter for near infrared light)

I stands for an infrared passband, typically the near-infrared band nearest visible light. There are various versions of it: the Johnson-Cousins system has one, but cited specifications I find for it vary: one being centered around 806 nm with a width (full width at half maximum) of 149 nm.

Among its uses is the observation of NIR from protoplanetary disks associated with young stellar objects.

I may also indicate a filter adhering to the specification and also to indicate the magnitude of the signal observed through the filter, e.g., citing "I = 1.5".

(EMR,infrared,near infrared,band,photometry)
806nm372THz1.6eVI band

Referenced by:
infrared (IR)
UBV photometric system