Elongated green UFO caught in California on May 2017

On May 2017, a person living somewhere in California has caught a photo of an elongated bright UFO. He has sent pictures on MUFON website. What is it?

Witness statement:

I was in my backyard on May 12, 2017 looking west from my backyard then started taking photos. I put my camera setting on continuous. I did not hear or see any objects with my naked eye. There were no airplanes in the area at the time. I was looking west at the time the photos were taken.
It must've been approx. around 8pm when I was taking photos. When loading my photos into iPhoto on my Mac computer is when I saw these three photos of this green object. I was shocked. I couldn't believe I caught something like this. It was an awesome feeling. Another one to add to my large collection. I was the only one out taking photo's. It was a very beautiful clear night. I used my Nikon D3300.

Thank you.