Astrophysics (index)about

Magnitude

(a logarithmic measure of brightness)

Astronomical Magnitude is an indicator of the brightness of a star (or other astronomical body) based upon differentiation of brightness by eye, or as has been formalized, a logarithmic scale with lower numbers brighter, essentially -2.5 times the log 10 of the intensity. Some magnitudes:

Relative magnitude:

m(1)-m(2) = -2.5 log(10)( I(1)/I(2) )

Apparent Magnitude is scaled so that the star, Vega, has a magnitude of 0. Absolute Magnitude is the apparent magnitude a star would have at 10 Parsecs.


(measure,brightness,logarithmic,EMR)
http://en.wikipedia.org/wiki/Magnitude_(astronomy)

Referenced by:
Absolute Magnitude (M)
AB System
AD Leonis (AD Leo)
APASS
APM Galaxy Survey (APMUKS)
Apparent Magnitude (m)
All Sky Automated Survey for SuperNovae (ASAS-SN)
Astronomical Catalog
Astronomical Survey
B
Bonner Durchmusterung Catalog (BD)
Beta Centauri
Bolometric Correction
Bolometric Magnitude (Mbol)
Color Index
Completeness
Cataclysmic Variable Star (CV)
Dense Core Mass Function (DCMF)
FU Orionis Star (FUor)
Galaxy Main Sequence
GAMA
Gas Fraction Estimation
Globular Cluster Luminosity Function (GCLF)
Guide Star Catalog (GSC)
Hipparchus
Holmberg Radius
I Band
K Band
K Correction
KELT
Lalande 21185
Main Sequence Fitting
MASCARA
Morphological Catalogue Of Galaxies (MCG)
M-Type Star (M)
NGTS
Nova
Photometer
Photometry
PLATO
R Band
Redshift-magnitude Relation
Ross 154
Ross 248
Scholz's Star
Supernova (SN)
Spectral Line
Spectroscopic Parallax
SuperWASP (SWASP)
Surface Brightness
Synthetic Photometry
Transiting Exoplanet Survey Satellite (TESS)
Transiting Planet
2dF Galaxy Redshift Survey (2dFGRS)
U
UBV Photometric System
V
Vega
Vega System

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