What’s that weird speck in my eclipse photo?

Maybe you didn’t plan ahead for the eclipse and found yourself in the same situation I did: unprepared. I expected to be traveling on Monday, so when I found myself under the clear Boston sky as the Moon began to move in front of the Sun, I had no eclipse glasses, no supplies to make a pinhole projector, and no decent camera. All I had was my iPhone SE in its grubby plastic case.
If you’re like me, you might have taken as many photos as you could with your setup, and discovered some