Q. What star or standard is used when rating the apparent brightness of stars?

Then the star's apparent brightness can be used to gauge its distance.

Their distance is then easily found from their apparent brightness.

Its companion is a type F4 star of apparent brightness 5.2.

For a single star, at that distance, to fire up to the apparent brightness of Jupiter is simply colossal.

Twice as much distance to a star does mean one-fourth the apparent brightness; but it also means eight times the number of stars.

The star has an apparent brightness of 3.72, the third brightest of the stars in the group.

This means, for example, that to the human eye it has the same apparent brightness (or luminance).

The phase of the planet greatly affects its apparent brightness.

In this way, the apparent brightness of the image is increased.