The degree of brightness of a star or other object in the sky according to a scale on which the brightest star has a magnitude -1 4 and the faintest visible star has magnitude 6 Sometimes referred to as apparent magnitude In this scale, each number is 2 5 times the brightness of the previous number Thus a star with a magnitude of 1 is 100 times brighter than on with a visual magnitude of 6
Magnitude - A numerical value for the brightness of a celestial object The brighter an object is in the sky, the smaller its magnitude The dimmer an object is in the sky, the larger its magnitude (Table reads from dimmest to brightest)
The brightness of a star or planet, expressed on a scale in which lower numbers mean greater brightness Apparent magnitude indicates the brightness of objects as we see them from Earth, regardless of their distance Absolute magnitude is defined magnitude a star would have if viewed from a standard distance of 10 parsecs (1 Parsec is 3 26 light years See below) Each step in magnitude equals a difference of 2 5 times in brightness: the brightes stars in the sky are apparent magnitude 1; the dimmest, 6 The magnitudes of extremely bright objects are expressed in negative numbers e g the apparent magnitude of the Sun is around -26
an arbitrary number, measured on a logarithmic scale, used to indicate the brightness of an object The brighter the star, the lower the numerical value of the magnitude and very bright objects have negative magnitudes
The degree of brightness of a celestial body designated on a numerical scale, on which the brightest star has magnitude -1 4 and the faintest star visible to the unaided eye, has magnitude 6 A decrease of one unit represents an increase in apparent brightness by a factor of 2 512 Apparent magnitude of a star is the brightness as we see it from Earth, whilst absolute magnitude is a measure of its intrinsic luminosity Lower numbers represent brighter objects
A way of expressing the brightness of astronomical objects inherited from the Greeks In the magnitude system, a lower number indicates a brighter object (for example, a 1st magnitude star is brighter than a 3rd magnitude star) Each step in magnitude corresponds to a brightnesss difference of a factor of about 2 5 Stars of the 6th magnitude are the faintest the unaided human eye can see
A numerical expression of the amount of energy released by an earthquake, determined by measuring earthquake waves on standardized recording instruments (seismographs ) The number scale for magnitudes is logarithmic rather than arithmetic; therefore, deflections on a seismograph for a magnitude 5 earthquake, for example, are 10 times greater than those for a magnitude 4 earthquake, 100 times greater than for a magnitude 3 earthquake, and so on
Scale used to measure the Brightness of a object The scale is logarithmical based This means that a magnitude difference of 5 means that the one object is 100 time brighter (or more luminous) than the other Objects with a smaller magnitude are brighter The Sun has a magnitude of about -26, the full moon -12, the faintest objects you can see naked eye are typically magnitude +5, and telescopes can now detect down to about mag +29/30 There are several of magnitude: Apparent, Absolute and Bolometric Apparent - The magnitude of an object as view from the earth Absolute - The magnitude of the object if it were to be viewed from 10 parsecs away Bolometric - The magnitude of the object if all its luminosity at all wavelengths were taken into account (ie Radio -> X-rays/Gamma radiation) N
The scale on which the brightness of a star is measured The brightest stars are first magnitude stars The faintest stars we can see with the unaided eye are fifth or sixth magnitude Sixth magnitude stars are 100x fainter than first magnitude stars
A measure of the strength of an earthquake or strain energy released by it, as determined by seismographic observations This is a logarithmic value originally defined by Charles Richter (1935) An increase of one unit of magnitude (for example, from 4 6 to 5 6) represents a 10-fold increase in wave amplitude on a seismogram or approximately a 30-fold increase in the energy released In other words, a magnitude 6 7 earthquake releases over 900 times (30 times 30) the energy of a 4 7 earthquake - or it takes about 900 magnitude 4 7 earthquakes to equal the energy released in a single 6 7 earthquake! There is no beginning nor end to this scale However, rock mechanics seems to preclude earthquakes smaller than about -1 or larger than about 9 5 A magnitude -1 0 event release about 900 times less energy than a magnitude 1 0 quake Except in special circumstances, earthquakes below magnitude 2 5 are not generally felt by humans
You can use order of magnitude when you are giving an approximate idea of the amount or importance of something. America and Russia do not face a problem of the same order of magnitude as Japan. = scale. In astronomy, the measure of the brightness of a star or other celestial body. The brighter the object, the lower the number assigned as a magnitude. In ancient times six magnitude classes were used, the first containing the brightest stars (see Hipparchus). In the present system a difference of one magnitude is defined as a ratio of brightness of 2.512 times. Thus, a difference of five magnitudes corresponds to a brightness ratio of 100 to
a number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10
Measurement of brightness The lower the magnitude value of an object, the brighter that object is Any given value is about 2 5 times dimmer than that value minus one, so mag 1 is 2 5 times brighter than mag 2, mag 2 is 2 5 times brighter than mag 3, and so on Magnitude can be negative, and often is with bright objects such as the Sun, the Moon and the occasional satellite With the occasional exception, most stars are 1st magnitude or fainter
The degree of brightness of a celestial body designated on a numerical scale, on which the brightest star has magnitude -1 4 and the faintest visible star has magnitude 6, with the scale rule such that a decrease of one unit represents an increase in apparent brightness by a factor of 2 512; also called apparent magnitude
A measure of the amount of light received from a celestial object Based on ancient Greek classifications, objects with smaller magnitudes are brighter ("those objects of the first magnitude" referred to the brightest objects) Since it originated in the appearance of objects perceived by the human eye, it is a scale of ratios rather than a linear scale: an object one magnitude brighter than another is about 2 512 times brighter The basis is a difference of five magnitudes is a difference in brightness of 100; thus, a difference of one magnitude is the fifth root of 100 The difference in magnitudes between two stars of brightnesses l1 and l2 is
The length of a magnetization vector In NMR, the square root of the sum of the squares of the Mx and My components, i e the magnitude of the transverse magnetization [Chapter 2]
A number, measured on a logarithmic scale, used to indicate the brightness of an object Two stars differing by 5 magnitudes differ in brightness by a factor of 100 The brighter the star, the lower the numerical value of the magnitude; very bright objects have negative magnitudes The star Vega (alpha Lyrae) is defined to be magnitude zero
If you talk about the magnitude of something, you are talking about its great size, scale, or importance. An operation of this magnitude is going to be difficult
brightness scale; the smaller the magnitude number, the brighter the object so that the Sun (magnitude -26) is much brighter than Uranus (magnitude +6)
A measure of the faintness of a star Magnitude 6 0 is the faintest we can ordinarily see, and the average of the twenty brightest stars defines magnitude 1 0 Each magnitude step is a factor of 2 5 in brightness
Apparent magnitude is an object's brightness as seen from Earth (e.g., -26.7 for the Sun, about -11 for the Moon). Absolute magnitude is an object's brightness as it would be seen at a distance of 10 parsecs (32.6 light-years; e.g., 4.8 for the Sun). See also albedo; photometry
A measure of the strength of an earthquake or strain energy released by it, as determined by seismographic observations The local body- and surface-wave magnitudes will have approximately the same numerical value
A number that characterizes the relative size of an earthquake Magnitude is based on measurement of the maximum motion recorded by a seismograph Several scales have been defined, but the most commonly used are (1) local magnitude (ML), commonly referred to as "Richter magnitude," (2) surface-wave magnitude (Ms), (3) body-wave magnitude (Mb), and (4) moment magnitude (Mw) Scales 1-3 have limited range and applicability and do not satisfactorily measure the size of the largest earthquakes The moment magnitude (Mw) scale, based on the concept of seismic moment, is uniformly applicable to all sizes of earthquakes but is more difficult to compute than the other types All magnitude scales should yield approximately the same value for any given earthquake
Measure of the brightness of a star The lower the number, the easier it is to see 7th magnitude it the dimmest object visible to the human eye Most CCD Cameras can pick up light at the 20th magnitude
used to quantify brightness Based on the ancient system of Hipparchus but refined and quantified for measurements today such that a ratio of 100 in brightness corresponds to a magnitude difference of 5 Fainter objects have larger, positive magnitudes (closer to positive infinity), while brighter objects have lower magnitudes (closer to negative infinity)