Aldebaran It looks can be deceiving
Vega If the Sun, Polaris, Sirius, Vega, Aldebaran was at the same distance from us shows that Polaris is the brightest, while the sun is barely visible to the naked eye.
Sirius A weak light bulb close is far more light than a lamp, so a faint star may look brighter than another really bright, so we talk about
apparent magnitude "m" and
absolute magnitude "M"
Polar
appearance is that we see
Absolute is that which would appear if all the stars were at the same distance, which by convention is "10 pc".
At this point, of course, there were also differences between the brightness, because we must keep in mind the size and energy that a star radiates to every square inch of his "surface".
Ancient astronomers could only watch the skies with the naked eye and had established a scale of 6 magnitudes:
Sun
The brightest stars were first-magnitude stars are barely visible
sixth .
In this scale also fit the planets, the moon and the sun reaching below zero zero
higher values \u200b\u200bcorrespond to fainter stars
Name ............. ...... m ........................ M ..................... real distance
Sun ....................- ............ 26.74 + 4.83 ..................... 8min light
Polar .................+ 2.3 .................- 4.6 ....................... 240 pc
Sirius .. .................- ................+ 1.45 1.41 ......... ............. 2.7 pc
Vega ..................+ ................+ 0.04 .. 0.5 ....................... 8.1 pc
Aldebaran .........+ 0.85 ........ .......- 21 ........................ 0.7 pc
absolute magnitude "M"
Polar appearance is that we see
Absolute is that which would appear if all the stars were at the same distance, which by convention is "10 pc".
At this point, of course, there were also differences between the brightness, because we must keep in mind the size and energy that a star radiates to every square inch of his "surface".
Ancient astronomers could only watch the skies with the naked eye and had established a scale of 6 magnitudes:
Sun The brightest stars were first-magnitude stars are barely visible
sixth .
In this scale also fit the planets, the moon and the sun reaching below zero zero
higher values \u200b\u200bcorrespond to fainter stars
Name ............. ...... m ........................ M ..................... real distance
Sun ....................- ............ 26.74 + 4.83 ..................... 8min light
Polar .................+ 2.3 .................- 4.6 ....................... 240 pc
Sirius .. .................- ................+ 1.45 1.41 ......... ............. 2.7 pc
Vega ..................+ ................+ 0.04 .. 0.5 ....................... 8.1 pc
Aldebaran .........+ 0.85 ........ .......- 21 ........................ 0.7 pc
