Assertion: luminosity | /r/HasProperty | calculated
Facets:
value: from an absolute magnitude
type: OTHER
Source sentences:
text: In some cases, the process of estimation is extreme, with luminosities being calculated when less than 1% of the energy output is observed, for example with a hot Wolf-Rayet star observed only in the infrared.
text: and the luminosity in watts can be calculated from an absolute magnitude (although absolute magnitudes are often not measured relative to an absolute flux):
text: In some cases, the process of estimation is extreme, with luminosities being calculated when less than 1% of the energy output is observed, for example with a hot Wolf-Rayet star observed only in the infra-red.
text: Rearranging this equation, knowing the flux from a star and its distance, the luminosity can be calculated, L = 4 π F d2.
text: In some cases, the process of estimation is extreme with luminosities being calculated when less than 1% of the energy output is observed, for example with a hot Wolf-Rayet star observed only in the infra-red.
text: Once their distance and apparent brightness is known, luminosity can be calculated.