(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 YSOs.
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".
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Referenced by pages:
UBV photometric system