magnitude system

magnitude system

[′mag·nə‚tüd ‚sis·təm]
(astronomy)
A system for designating the relative brightness of stars when photography is used; emulsions of different color sensitivities, used with color filters, permit measurements of starlight of different wavelengths with corresponding determination of magnitude at these wavelengths.
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References in periodicals archive ?
Coincidentally, the catalog of the ancient Greek inventor of the magnitude system, Hipparchus, includes about 850 stars.
The ancient Greek astronomer Hipparchus introduced the magnitude system.
The magnitude system began about 2,100 years ago when the Greek astronomer Hipparchus divided stars into brightness classes.
All objects have been placed on a scale relating to their brightness,or luminosity,known as the magnitude system.
Today the magnitude system is based on photometry, and it seems a little confusing that a higher magnitude number means a dimmer object, but that is the custom.
The MAGNITUDE system is the only networked storage solution designed from the ground up to include a virtualized storage architecture.
Volume 1, like Burnham's, begins with a roughly 100-page introduction to the astronomy that an amateur really needs to know: the celestial sphere and the sky's motions, the magnitude system, angular measures, and so on, along with lots about the various types of objects to be seen in amateur scopes.
Now let's turn the ancient magnitude system around, so that brighter objects get higher numbers.
Estimating the brightness of stars dates back to the second century BC, when the Greek astronomer Hipparchus devised a magnitude system that's still in use today.
The MAGNITUDE system is the only networked storage foundation designed from the ground up to include a virtualized storage architecture.
For this, you should change the values for central wavelength (WA in microns on line 40), the peak transmission (TF expressed as a fraction on line 3080), the full-width-half-maximum transmission of the filter (DL in microns on line 3020), the quantum efficiency at the central wavelength (Q given as a fraction on line 60), and the zero of the magnitude system (MO on line 80).
The MAGNITUDE system is the only SAN designed from the ground up to include a virtualized storage architecture.