Also commonly used is the "'absolute bolometric magnitude "', which is the total luminosity expressed in magnitude units that takes into account energy radiated at all wavelengths, whether visible or not.
22.
Placing a radiation source ( e . g . star ) at the standard distance of 10 parsecs, it follows that the zero point of the apparent bolometric magnitude scale 0 } } corresponds to irradiance } }.
23.
In August 2015, the International Astronomical Union passed Resolution B2 defining the zero points of the absolute and apparent bolometric magnitude scales in SI units for power ( watts ) and irradiance ( W / m 2 ), respectively.
24.
Using the IAU 2015 scale, the nominal total solar irradiance ( " solar constant " ) measured at 1 astronomical unit ( ) corresponds to an apparent bolometric magnitude of the Sun of } } " 26.832.
25.
Wray 17-96 has an absolute bolometric magnitude of & minus; 10.9 ( 1.8 million solar units ), making it one of the interstellar extinction and the visual brightness is reduced by nearly 9 magnitudes.
26.
Resolution B2 defines an absolute bolometric magnitude scale where 0 } } corresponds to luminosity } }, with the zero point luminosity set such that the Sun ( with nominal luminosity ) corresponds to absolute bolometric magnitude } } 4.74.
27.
Resolution B2 defines an absolute bolometric magnitude scale where 0 } } corresponds to luminosity } }, with the zero point luminosity set such that the Sun ( with nominal luminosity ) corresponds to absolute bolometric magnitude } } 4.74.
28.
This led to systematic differences in bolometric corrections scales, which when combined with incorrect assumed absolute bolometric magnitudes for the Sun could lead to systematic errors in estimated stellar luminosities ( and stellar properties calculated which rely on stellar luminosity, such as radii, ages, and so on ).
29.
In August 2015, the IAU passed Resolution B2, which as part of the definition of a standardized absolute and apparent bolometric magnitude scale, included an explicit definition of the parsec as exactly | } } astronomical units, or approximately metres ( based on the IAU 2012 exact SI definition of the astronomical unit ).
30.
Across all wavelengths, is estimated to be the more luminous of the two, 6, 300, 000 times the Sun's luminosity ( absolute bolometric magnitude-12.25 ) compared to at 5, 000, 000 times the Sun's luminosity ( absolute bolometric magnitude-12.0 ).
