On motorcycle, clear night, glowing clam shaped object appears, hovers, then dives but disappears

I have never seen anything like this in my life. I was travelling on my motorcycle on the 71 freeway south. Going from Pomona, CA to Corona, CA. About 5-10 miles out of Chino Hills, CA, to my right at a 45 degree angle, a green glowing clam shaped object appeared. The object hovered for a split second then dove towards the ground but disappeared. This was not a comet. There was no trail in the sky. The object appeared out of nowhere and comets dont hover or just disappear. The green glow was amazing and looked vry unreal but it was there.

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