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Sounds like its not a catalogued item, ie not something in the solar system or beyond.
Noctilucent clouds or contrails can be high in a non-turbulent slow flow of the atmosphere and may appear to not be moving.
Test: pencil and paper sketch it along with the positions of stars around it. Wait 5-10min and repeat and you should see its position in relation to the stars has changed.
Reflections? While at the eyepiece have your wife cover and uncover the end of the scope while you watch the object. Alternately have her drape a towel over your head and eyepiece then remove it while observing the object. Do these without wobbling the scope if possible. If the object reacts in any way then its some kind of reflection, probably sideways light touching the eye or eyepiece (or eyelash).
Also try changing eyepieces, it could be a fibre or eyelash/oil on one eyepiece. If you can photograph it it should be plate solvable. Try anything you can think of to test if its something in the sky or at the equipment. It'll probably remain a mystery. If you can photograph at the eyepiece or at least sketch the stars as best you can then people can help track down if it was a galaxy edge on you saw, or possibly a known rocket launch or whatever.
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