astronomical magnitude造句

• The BOA introduces a neutral density filter to the optical path that attenuates the light by approximately a factor of one hundred ( five astronomical magnitudes ).
• It was named after the English astronomer Norman Pogson ( 1829 1891 ), inventor of the modern astronomical magnitude scale and discoverer of eight minor planets, including 42 Isis and 67 Asia.
• These images are processed to produce lists of objects observed and various parameters, such as whether they seem pointlike or extended ( as a galaxy might ) and how the brightness on the astronomical magnitude.
• AB magnitude is defined as the logarithm of a spectral flux density with the usual scaling of astronomical magnitudes and a zero-point of 3631 Jansky, where 1 Jansky = 1 Jy = 10 & minus; 26 W Hz & minus; 1 m & minus; 2 = 10 & minus; 23 erg s & minus; 1 Hz & minus; 1 cm & minus; 2.