It is 754.81 milliarcseconds. Also, the star is Rigil Kentaurus, not Rigel which is the name of another star.
Rigel or Beta Orionis is a blue/white supergiant star of spectral type B8lab.
The closer the star, the greater the parallax angle, which is why you can't measure the distance to very distant stars using the parallax method.
It's distance
The parallax should get smaller and harder to notice although in astronomy there are techniques used to find the parallax of stars by using the Earth's position around the sun to find the distance of the stars.
The parallax is 379.21 mas (Minute of arc) [See related link] or 2.64 parsecs [See related link]
.2 arc sec
Rigel or Beta Orionis is a blue/white supergiant star of spectral type B8lab.
The parallax angle of such distant objects is way too small to be measured. In general, the farther away an object, the smaller is its parallax angle.
The closer the star, the greater the parallax angle, which is why you can't measure the distance to very distant stars using the parallax method.
Parallax would be easier to measure if the Earth were farther from the sun. This way, there will be a wider angle to the stars using the parallax method.
Sirius will have a greater angle, because it is closer to us.
You can conclude that it is farther than a certain distance. How much this distance is depends, of course, on how accurately the parallax angle can be measured.
On the contrary, if the parallax angle is too small, it can't be measured accurately.
It's distance
Parallax
Accuracy of readings of e.g. meters and certain optical instruments. Parallax is also used in astronomy for calculating distances to(astronmically)far-away objects.
It means that the distance is greater than a certain amount - depending on how precisely you can measure the parallax.