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V

(V band)
(photometric filter for visible light)

The letter V (or V band) is commonly used to indicate a passband located within the visible light range (V for visual). The letter is also often used for a filter for the band (or more explicitly, a V filter), and to indicate a magnitude of a signal observed through such a filter, e.g., citing "v = 1.5".

In the conventional UBV photometric system and its offshoots, the V band is centered around wavelength 551 nm, with a width of 88 nm (full width at half maximum). Other systems may have different specifications, sometimes similar.

I've seen "V" explained as "violet", but in the UBV system, it is outside the violet range.


(EMR,visible light,band,visual,photometry)
http://en.wikipedia.org/wiki/Photometric_system
WaveLFreqPhoton
Energy
  
551nm544THz2.3eVV

Referenced by:
Achernar
AD Leonis (AD Leo)
Algol (Beta Per)
Alpha Centauri
Arcturus
AU Microscopii (AU Mic)
Barnard's Star
Betelgeuse
Canopus
color-color diagram (CCD)
color index
color-period diagram
Epsilon Eridani
Epsilon Indi (ε Indi)
HR 8799
Kapteyn's Star
Lacaille 9352
Lalande 21185
Luyten 726-8
passband
Procyon
reddening
Rigel
Ross 154
Ross 248
Sirius
SkyMapper Southern Survey (SMSS)
stellar radius determination
Sun
T Tauri
TW Hydrae (TW Hya)
UBV photometric system
Vega
Wolf 359

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