| definition |
The magnitude a star would have if it were at a distance of 10 parsecs in a void space,
without interstellar absorption. The absolute magnitude is usually deduced from the
visual magnitude, measured through a V filter (UBV system), when it is written as
M_V. If it is defined for another wavelength, it gets another index (U, B, etc). If
the radiation on all wavelengths is included, it becomes absolute bolometric magnitude,
M_bol. The Sun has the absolute magnitude +4.8. Most of the stars have absolute magnitudes
ranging between -9 (supergiants) and +19 (red dwarfs).
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