Fr.: magnitude absolue
1) 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 MV. 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, Mbol.
The Sun has the absolute magnitude + 4.8. Most of the stars have absolute magnitudes ranging
between -9 (→ supergiants) and + 19
(→ red dwarfs)