Visual Magnitude
Related Category: Astronomy: General
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More on Visual Magnitude
Magnitude - in astronomy, measure of the brightness of a star or other celestial object.
VISUAL MAGNITUDE
Visual (apparent) magnitude is a measure of the brightness of a celestial object as seen from Earth. The lower the number, the brighter the object. Negative numbers indicate extreme brightness.
Visual Magnitude
A scale used by astronomers to measure the brightness of a star or other celestial object. Visual magnitude measures only the visible light from the object. On this scale, bright objects have a lower number than dim objects.
Photovisual Magnitude
The magnitude of an object as measured photographically by filters and emulsions that are sensitive to the same region of the spectrum as the human eye. (antiquated)
Photovoltaic Effect ...
Visual Magnitudes of Other Objects
. . .To be completed. . .
In the meantime, here are some internet references: ...
The Visual Magnitude and distance indicate a luminosity 110 times that of the sun. The star has about 28 times the diameter of the sun.
This visual magnitude depends considerably on how close the star is as well as its intrinsic brightness. Obviously a very bright star at a considerable distance will appear dimmer to us than a less bright star which is quite a bit closer.
absolute visual magnitude
Intrinsic brightness of a star. The apparent visual magnitude the star would have if it were 10 pc away.
absorption line ...
27v visual magnitude,[11] Alpha Centauri appears to the naked-eye as a single star and is fainter than Sirius and Canopus. The next brightest star in the night sky is Arcturus.
Polaris has a visual magnitude of 1.97 (second magnitude). In 3000 BC the faint star Thuban in the constellation Draco was the North Star. At magnitude 3.67 (fourth magnitude) it is only one-fifth as bright as Polaris.
Therefore the visual magnitude of Vega was decided to be, by definition, zero at all wavelengths for many years (this is no longer the case, ...
At an apparent visual magnitude that varies between +2.01 and +2.10, [4], beta Andromedae or Mirach, is the second brightest star in the Andromeda constellation. It is a red giant 200 light-years distant from the Earth.
visual magnitude (NASA SP-7, 1965) (symbol mv)
The apparent magnitude of a star or other celestial body measured by visual observation. See photovisual magnitude, color index.
fireballs (AS&T Dictionary) Bright meteors with an apparent visual magnitude of -4 mag. or brighter. fireflies (NASA Thesaurus) Flying insects which produce light by bioluminescence. firing (NASA SP-7, 1965) 1.
See also: Meteoroid Stream Fireball A bright meteor with an apparent visual magnitude of -4 mag. or brighter. See also: Meteor, Meteorite, Meteoroid, Persistent train Geocentric Earth-centered. Heliocentric Sun-centered.
Typically shining at visual magnitude 0.7 (ranking 11th in the sky), this class M (M1.5) red supergiant (with a temperature of about 3650 Kelvin) is a semi-regular variable that changes between magnitude 0.3 and 1.
Without comment the visual magnitude is meant.
The distances (in lightyears) are based on the trigonomic parallaxes taken from the Hipparcos/Tycho Catalogs.
The corrections required to reduce visual magnitudes to bolometric magnitudes are large for very cool stars and for very hot ones but are relatively small for stars such as the Sun.
Related plots are the color-magnitude plot (absolute or apparent visual magnitude against color index) and the spectrum-magnitude plot (visual magnitude versus spectral type)the original form of the H-R diagram. [H76] ...
We use the visual magnitude, also known as apparent magnitude, to tell others how bright a star is. It is a log scale in intensity. Thus, magnitude and intensity both are scales for brightness of a star.
The lower of the two artery stars, Tau Sco, is a B0 dwarf (visual magnitude 2.78, absolute magnitude 2.82, distance 430 light-years).
The brightest star, Sirius, shines at visual magnitude -1.5. Jupiter can get about as bright as visual magnitude -3 and Venus as bright as -4. The full moon is near magnitude -13, and the sun near mag -26.
Sekanina calculates that a 1013--kilogram fragment, a reasonable value for the largest piece, will reach an apparent visual magnitude of -10 during the terminal explosion.
As all the stars of a globular cluster are at approximately the same distance from us, their absolute magnitudes differ from their visual magnitude by about the same amount.
So if the full Moon as seen on Earth has a visual magnitude of -12.7, its brightness at first quarter (phase angle 90 degrees) would be magnitude -10.0, a brightness reduction of 12x.
Third, for telescopes in the aperture range 6" to 12", the diffraction rings should be examined in a unitary (not double) star between visual magnitudes 3 to 5. Pickering recommended a magnitude of 1 or 2, but was also using a 5" telescope.
The Yale Bright Star Catalogue's notes entry for HR 8721 indicate that TW PsA is a BY Draconi-type variable (Vogt et al, 1983) that varies in apparent visual magnitude from 6.44 to 6.
The tables below are ordered by visual magnitude ("Vo"; bigger numbers are dimmer); this is the maximum brightness that the object attains (approximately when it is closest to Earth). "Date" is the date of discovery.
Unaided Eye ...
Normally one must state the frequency range over which the measurement is made. The Sun has an absolute visual magnitude of 4.83, and the brightest star in the sky, Sirius, has an absolute visual magnitude of 1.4 and an apparent magnitude of -4.6.
It is interesting (if not slightly suspicious) that some QSOs at z~3 are not very faint (visual magnitudes 16-18). The current redshift record is 5.80 (as of November 2000 with the first round of SDSS objects, Fan et al. 2000 AJ 120, 1167).
The star ε Eridanus has an apparent visual magnitude of V = 3.73 and an apparent blue magnitude of B = 4.61.
a) What is its colour index?
b) What is its approximate spectral class?
*App. vis. mag. = Apparent visual magnitude
Abs. vis. mag. = Absolute visual magnitude
Notes ...
38,000 times brighter than the sun. Absolute visual magnitude, Mv =-6.7
Where to View:
Located in the constellation of Cepheus (Star Map) ...
This table shows the apparent and absolute visual magnitudes of some stars and their distances:
StarmvMvd (pc)
Sun
-26.8 ...
H
H is an asteroid's absolute magnitude, the visual magnitude the asteroid would have if it were located 1 AU from Earth.
...
The visible star is a O9I blue supergiant, with a visual magnitude of around 9, and would be hard to distinguish from the other stars in the Milky Way without a good star chart.
It is an Stellar classification#Class A main sequence star with an apparent visual magnitude of 0.77 and is one of the vertices of the Summer Triangle; the other two are Deneb and Vega....
(the male cow-herd deity) in the constellation ...
A Dictionary of Earth Sciences entry for magnitude, earthquake
The Columbia Encyclopedia, Sixth Edition entry for visual magnitude
The Columbia Encyclopedia, Sixth Edition entry for photographic magnitude ...
As an example, we have already discussed how the Sun peaks in the yellow-green part of the spectrum so its Visual magnitude is greater than its Blue or Ultraviolet. In fact (B-V) for the sun is +0.62, i.e., it is brighter in V than in B.
 See also: Magnitude, Star, Constellation, Astronomy, Year
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