There are two other Enochs - one which is Slavonic, 2 Enoch, and the other, 3 Enoch, which is a Hebrew Apocalypse by Rabbi Ishmael in 132 A.D. (approx) so it probably isn't relevant to this project.
The one you are reading - 1 Enoch - is the oldest and most complete. It was first discovered in Ethiopia (in the Ge'ez language) where it had been preserved but was then confirmed by the finding of the 200 B.C. Aramaic copies at Qumran. It is most likely the one referenced by Jude.
The 2 Enoch is also quite interested, particularly in its prophesies concerning the 7,000 years allowed for Adamic man (including the 1,000 perfect era at the end.) It is highly fragmented and the origin is much in dispute, though there is some indication it may have been translated from Greek.
I'm planning on doing a summary of this research into the book of astronomy and posting it here for anyone interested. I'll also probably add it to my article on Origins.