(photometric filter for blue light)
The letter 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,
and has 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.
Other systems may have different specifications,
in some cases, similar.
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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Referenced by pages:
AB Pictoris (AB Pic)
AD Leonis (AD Leo)
Algol (Beta Per)
Alpha Centauri (α Centauri)
AU Microscopii (AU Mic)
color-color diagram (CCD)
Epsilon Indi (ε Indi)
globular cluster luminosity function (GCLF)
Holmberg radius (RH)
Millennium Galaxy Catalogue (MGC)
sensitivity function (S)
stellar radius determination
TW Hydrae (TW Hya)
UBV photometric system