It seems that the distance is currently not known with a greater accuracy than this.

There is no star with that name. Many stars have names that start with "Epsilon", followed by the genitive of a constellation, e.g. "Epsilon Cruxis", "Epsilon Geminorum", etc.

If its epsilon segin cassiopeia, it is 520L/Y(light years) away from earth.

No the Theory That a Black Hole is causing the Eclipsing of Epsilon Aurigae has been Discarded, Mainly because the Eclipsing companion does not show the characteristics of a Black Hole.

the accepted Model for the companion is that its a Binary Star system surrounded by a immense disk consisting of dust and that a "Central Opening Lay" in the disc is causing the sudden Brightness increase mid way through an eclipse.

The Exact Nature of the Eclipsing Component is currently unclear, and there are Many Theories Explaining what it actually is.

you can read a comprehensive article about the Epsilon Aurigae system on AAVO (American Association of Variable Star Observers) Website.

http://www.aavso.org/vstar/vsots/eps_aur.shtml

Read More about it on Wikipedia

http://en.wikipedia.org/wiki/Epsilon_Aurigae

Since Almaaz, also known as Epsilon Aurigae is a binary star, meaning two stars in one, it is both a yellow dwarf and a blue giant causing a slight whitish tint to both stars. You can find Almaaz in the Auriga constellation.