Telescopi = some Italian vendor of telescopes, I think.

Telescopii = the genitive case of Telescopium, the constellation.

"Telescopium", the word, is a Latin rendering (used by Kepler, 1613) of an Italian word ("telescopio", used by Galileo, 1611) derived from the compunding of two Greek words, ôåëå, "far", and óêïðïó, "view". Galileo and Kepler were of course referring to the instrument, since the constellation wasn't named until 1751 at the earliest.

The word's gender is neuter; "Telescopii" means "of or belonging to Telescope", thus: "Video Telescopii stellas" = "I see the stars of Telescopium" or "I see The Telescope's stars." I understand that there is a variable star called R Telescopii in Telescopium as well.

Is that what you had in mind?

Regards--
Mary Anne