(photometric filter for blue light)
B is commonly used to designate a blue passband
or a corresponding filter.
Without further qualification, B is most often intended to mean
the blue passband/filter of the UBV photometric system,
in which it is centered around wavelength 445 nm,
with a width of 94 nm (full width at half maximum).
This falls in the blue range of the spectrum,
its width ranging from violet to green.
The letter is also used to indicate the magnitude of the signal
observed through the filter, e.g., citing "b = 1.5".
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AD Leonis (AD Leo)
Algol (Beta Per)
AU Microscopii (AU Mic)
color-color diagram (CCD)
Epsilon Indi (ε Indi)
globular cluster luminosity function (GCLF)
sensitivity function (S)
stellar radius determination
TW Hydrae (TW Hya)
UBV photometric system