Lime green lozenge -shaped light shot across the sky.

I was sitting on my back porch with my cat.  At a few minutes after 9pm, a lime green lozenge-shaped light appeared on my right heading toward the Santa Cruz mountains.  There was no sound and no disintegrating effect like a meteor.  The edges of the light were fuzzy.  
The light shot over the mountains.  As it did, it illuminated the underside of the clouds.  
I ran into my house yelling that I had seen a UFO. 
I immediately telephoned Vandenberg Air Force Base to ask if they had launched anything and they said no.
Date may be approximate, although the witness does not indicate that fact.  PD