magnitude$46256$ - translation to greek
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magnitude$46256$ - translation to greek

LOGARITHMIC MEASURE OF THE BRIGHTNESS OF AN ASTRONOMICAL OBJECT
Second magnitude; First magnitude; Combined magnitude; Astronomical magnitude; Star magnitude; Micromagnitude
  • center

magnitude      
n. μέγεθος, σημασία
absolute magnitude         
  • Phase integrals for various values of G
  • Dawn]] spacecraft at phase angles of 0°, 7° and 33°. The strong difference in brightness between the three is real. The left image at 0° phase angle shows the brightness surge due to the [[opposition effect]].
  • Brightness with phase for diffuse reflection models. The sphere is 2/3 as bright at zero phase, while the disk can't be seen beyond 90 degrees.
  • Diffuse reflection on sphere and flat disk
  • The phase angle <math>\alpha</math> can be calculated from the distances body-sun, observer-sun and observer-body, using the [[law of cosines]].
  • Relation between the slope parameter <math>G</math> and the opposition surge. Larger values of <math>G</math> correspond to a less pronounced opposition effect. For most asteroids, a value of <math>G = 0.15</math> is assumed, corresponding to an opposition surge of <math>0.3\text{ mag}</math>.
LOGARITHMIC MEASURE OF THE LUMINOSITY OF A CELESTIAL OBJECT
Bolometric magnitude; Absolute brightness; Absolute Visual Magnitude; Absolute Magnitude; Absolute bolometric magnitude; Intrinsic brightness; Absolute luminosity; Absolute visual magnitude; Absolute magnitude (H)
απόλυτο μέγεθος
absolute value         
NONNEGATIVE NUMBER WITH THE SAME MAGNITUDE AS A GIVEN REAL NUMBER
Modulus function; Absolute value (mathematics); Absolute Value; Absolute Value (mathematics); Absolute Values; Absolute values; Absolute Square; Abs(); Modulus of complex number; Fabs(); Math.fabs; Module of a complex number; Complex abs; Absolute value of number; Magnitude of Complex Number; Absolute value of a complex number; Modulus of a complex number; Magnitude of a complex number; Abs(x)
απόλυτη αξία, απόλυτη τιμή

Definition

magnitude
n.
1) considerable, great magnitude
2) of a certain magnitude (of considerable magnitude)

Wikipedia

Magnitude (astronomy)

In astronomy, magnitude is a unitless measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths. An imprecise but systematic determination of the magnitude of objects was introduced in ancient times by Hipparchus.

The scale is logarithmic and defined such that a magnitude 1 star is exactly 100 times brighter than a magnitude 6 star. Thus each step of one magnitude is 100 5 2.512 {\displaystyle {\sqrt[{5}]{100}}\approx 2.512} times brighter than the magnitude 1 higher. The brighter an object appears, the lower the value of its magnitude, with the brightest objects reaching negative values.

Astronomers use two different definitions of magnitude: apparent magnitude and absolute magnitude. The apparent magnitude (m) is the brightness of an object as it appears in the night sky from Earth. Apparent magnitude depends on an object's intrinsic luminosity, its distance, and the extinction reducing its brightness. The absolute magnitude (M) describes the intrinsic luminosity emitted by an object and is defined to be equal to the apparent magnitude that the object would have if it were placed at a certain distance from Earth, 10 parsecs for stars. A more complex definition of absolute magnitude is used for planets and small Solar System bodies, based on its brightness at one astronomical unit from the observer and the Sun.

The Sun has an apparent magnitude of −27 and Sirius, the brightest visible star in the night sky, −1.46. Venus at its brightest is -5. The International Space Station (ISS) sometimes reaches a magnitude of −6.

Amateur astronomers commonly express the darkness of the sky in terms of limiting magnitude, i.e. the apparent magnitude of the faintest star they can see with the naked eye. At a dark site it usual for people to see stars of 6th magnitude or fainter.

Apparent magnitude is really a measure of illuminance, which can also be measured in photometric units such as lux.