What's the Name of That Book??? discussion

This topic is about
Collidescope
SOLVED: Children's/YA
>
SOLVED. Read around 1995. Scifi. Adolescent. A guy (probably boy) who uses kaleidoscopic crystals to pilot a spaceship. [s]
date
newest »

Vulco1, about how old is the main character? What events or personal connections put this character in a position to pilot a spaceship? Is there a war between humans and (invading) aliens?

Here is a description from NoveList:
When his spaceship crashes to earth, a highly advanced alien interferes with the lives of two teenagers--on a Delaware Indian--living on the island of Manhattan during different centuries.
Here is a longer description from Kirkus:
A synthetic guardian from space teams up with(view spoiler) 20th-century high-school girl. Hahn Ixpodsix (Humanoid Android for Hyperspace Navigation class 9, ship 6) is (view spoiler)
The book took place in the "contemporary" time and in America if not the western world.
I think the hardback cover was purple with a brown or tawny ship on the cover and maybe a rainbow as the rings around a planet.
I think there was some space combat, more like Star Trek than Battle Star Galactica.
I remember thinking at the time that it was like a book version of the Captain Blood video game.
Thank you