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===Apparent bolometric magnitude=== While magnitude generally refers to a measurement in a particular filter band corresponding to some range of wavelengths, the apparent or absolute '''bolometric magnitude''' (m<sub>bol</sub>) is a measure of an object's apparent or absolute brightness integrated over all wavelengths of the electromagnetic spectrum (also known as the object's [[irradiance]] or power, respectively). The zero point of the apparent bolometric magnitude scale is based on the definition that an apparent bolometric magnitude of 0 mag is equivalent to a received irradiance of 2.518Γ10<sup>β8</sup> [[watt]]s per square metre (WΒ·m<sup>β2</sup>).<ref name="IAU2015B2">{{cite journal |author=IAU Inter-Division A-G Working Group on Nominal Units for Stellar & Planetary Astronomy |title=IAU 2015 Resolution B2 on Recommended Zero Points for the Absolute and Apparent Bolometric Magnitude Scales |url=https://www.iau.org/static/resolutions/IAU2015_English.pdf |journal=Resolutions Adopted at the General Assemblies |date=13 August 2015 |arxiv=1510.06262 |bibcode=2015arXiv151006262M |access-date=19 May 2019 |archive-url=https://web.archive.org/web/20160128180606/https://www.iau.org/static/resolutions/IAU2015_English.pdf |archive-date=28 January 2016 |url-status=live }}</ref>
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