First off I'll say this. It passes the basic standard "ORB" test as you yourself probably already know.
Although the EXIF data still was not on the image, I know the source personally and its a very trusted source. (Maria) So as far as the image being authentic and unmodified I know I can personally vouch for this source.
No flash was used, so that eliminates the possibility of a "Dust" or particle or reflected light orb. Also the orb seems to have self-illuminating properties.
On the negative side, although the orb seems to be self-luminous, I don't see any evidence on the adjacent objects that there is any reflective illumination from the orb. The only evidence that the orb exists is from the orb itself.
In my opinion there are two possible options here.
- This is an orb caused by a lens flare from the bright light in the upper right of the image reflecting off the internal lens surfaces within the camera. This could account for the green appearance.
- This is a genuine self-illuminating orb caused by some short term burst of energy which was caught on "Film"
My personal opinion, I tend to lean towards the lens flare. I was actually hoping for a genuine 1% orb. And I was trying to prove that the semi-circular direction of the orb was not pointing the the mid-point of the lens. But as I was bisecting the mid-line of the orb and creating a ray in the direction of the orb's semi-circle I realized that the ray was DIRECTLY pointing at the source of light on the right side. I pulled up quite a few examples of lens flares from Google and in each case the direction of the semi-circle of the lens flare was a direct line to the source of light causing the lens flare.