Astrophysics (Index)About

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 or visible). 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, in some cases, similar.

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


(EMR,visible light,band,visual,photometry)
Further reading:
https://en.wikipedia.org/wiki/Photometric_system
https://en.wikipedia.org/wiki/UBV_photometric_system
https://ui.adsabs.harvard.edu/abs/1953ApJ...117..313J/abstract
https://www.schoolsobservatory.org/learn/tech/instruments/filters
https://sites.astro.caltech.edu/~george/ay122/Bessel2005ARAA43p293.pdf
WaveLFreqPhoton
Energy
  
551nm544THz2.3eVV

Referenced by pages:
AB Aurigae (AB Aur)
AB Pictoris (AB Pic)
absolute magnitude (M)
Achernar
AD Leonis (AD Leo)
Algol (Beta Per)
Alpha Centauri (α Centauri)
apparent magnitude (m)
Arcturus
AU Microscopii (AU Mic)
Barnard's Star
Betelgeuse
Canopus
Capella
color index
color-color diagram (CCD)
color-period diagram
DM Tau
Epsilon Eridani (ε Eridani)
Epsilon Indi (ε Indi)
Giclas 29-38 (G 29-38)
HR 8799
infrared excess (IRX)
Kapteyn's Star
Lacaille 9352
Lalande 21185
Luyten 726-8
magnitude
MWC 758
passband
Procyon
reddening
Rigel
Ross 154
Ross 248
Sirius
SkyMapper Southern Survey (SMSS)
stellar radius determination
Sun
T Tauri
Teegarden's Star
TW Hydrae (TW Hya)
UBV photometric system
UVJ diagram
Vega
VY Canis Majoris (VY CMa)
Wesenheit function
Wolf 359
WR 140

Index