Which has a greater luminosity a star with absolute magnitude 4 or a star with absolute magnitude 6?

A fourth magnitude star is 2.512 times as bright as a fifth magnitude star, and a second magnitude star is (2.512)4 = 39.82 times brighter than a sixth magnitude star. …

Does luminosity change with distance?

The difference between luminosity and apparent brightness depends on distance. If you put an automobile headlight 10 feet away and a flashlight 10 feet away, the flashlight will appear fainter because its luminosity is smaller. Stars have a wide range of apparent brightness measured here on Earth.

Which star is the most luminous and gives off the most light?

The luminosities are measured in bolometric luminosity and not by visual luminosity. For example, Alpha Centauri A is the most luminous star within 5 light-years of the Sun….List of stars more luminous than any closer star.

Name	Sirius
Constellation	Canis Major
Bolometric luminosity (Solar lum.)	25.4
abs. V mag.	1.42
Distance (ly)	8.60

How bright does a star appear from Earth?

A glance at the night sky above Earth shows that some stars are much brighter than others. Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.

How much brighter will a 1st magnitude star appear than a 4th magnitude star?

So a 1st magnitude star is 2.512 times brighter than a 2nd magnitude star, and 2.5122=6.31 times brighter than a 3rd magnitude star, and 2.5123=15.9 times brighter than a 4th magnitude star, 2.5124=39.8 times brighter than a 5th magnitude star, and 2.5125=100 times brighter than a 6th magnitude star.

How much brighter will a 2nd magnitude star appear than a 4th magnitude star?

A second magnitude star is not 5 times brighter (2.5 + 2.5) than a fourth magnitude star, but rather 6.25 times brighter (2.5 x 2.5). A second magnitude star is 10 magnitudes different from a 12th magnitude star; this means that the second magnitude star is 10,000 times brighter (100 x 100), not 200 times (100 + 100).

Which 3 stars are the most luminous?

At least three stars in the constellation Canis Major are thought to be thousands of times more luminous than Sirius: Aludra, Wezen, and Omicron 2.

What makes the brightness of the stars?

A star’s brightness also depends on its proximity to us. The more distant an object is, the dimmer it appears. Therefore, if two stars have the same level of brightness, but one is farther away, the closer star will appear brighter than the more distant star – even though they are equally bright!

Is Jupiter the brightest star?

Jupiter is the second-brightest starlike object in the December evening sky (only Venus appears as a brighter “star”). Jupiter is still near fainter Saturn in our sky, nearly a year after their late 2020 great conjunction.