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The second image is definitely interesting!
Did you see anything when you took it? It's definitely not a meteor, although the shape resembles the persistent train a bright meteor could create - however they never appear green in photos. The only thing that I can think of that could account for this, would have to be a fire-fly.
The third image is a meteor - I'm pretty certain of that!
I'll leave it for others to comment on your Sirius photo...