stellar brightness

stellar brightness It is the light energy from that star in 1 second per 1 unit of area brightness is a unit quantity. But the brightness rating has no unit. It's just a given number. with the principle that there is no unit It's just a given number. The principle is that the stars are the faintest that the naked eye can see. It has a brightness rating of 6 and the brightest stars have a brightness rating of 1 star with different brightness ratings. 1 will have a difference of brightness about 2.5 times. If the brightness rating is different, 5 will be different (2.5)2 or 100 times when using this brightness rating scale. It is found that the Sun has a brightness rating of -26.7. This rule applies to other celestial bodies. that does not light itself, such as planets, moons
Here are some examples of the brightness ratings of the major stars in the sky.
เบทฟิก
Table 5.1 Brightness ratings of stars in the sky

Brightness Rank Example
-26.7 sun
-4.5 Venus when brightest
-3.5 Venus when most flickering
-2.7 Mars when brightest
-2.5 Jupiter when brightest
-1.5 Mercury when brightest
-1.5 star serial
-1.4 Jupiter when it's most flickering
-0.5 Saturn when brightest
-1 about 20 stars
0 stars, about 20 stars
1 star, about 20 stars
1.2 Saturn when the battle is at its dimest
1.6 Mars when it's the faintest
2.6 Mercury at its faintest
3 of the most flickering stars that could be seen in a big city
6 of the most flickering stars that could be seen in the countryside

The brightness of the stars observed in the Earth is called Brightness Rank Appears which is a brightness rating that cannot be compared with the actual brightness of a star because the brightness that we see on Earth depends on the distance the star is from the Earth. Therefore, astronomers set true brightness rating of a star as its apparent brightness when it is 10 parsec, or 32.61 light-years from Earth, so that the brightness ratings of the stars can be compared.