| 释义 |
Pogson ratio
Pogson ratio (ˈpɒdʒsən) n (Astronomy) the brightness ratio of two celestial objects that differ by one magnitude. On the Pogson scale a difference of 5 magnitudes is defined as a difference of 100 in the intensities of two stars; therefore a difference of 1 magnitude is equal to the fifth root of 100, i.e. 2.512[C19: named after N. R. Pogson (1829–91), British astronomer]
Pogson ratio
Pogson ratio (pog -sŏn) See magnitude. |