Potential UFO in the Sky in my photograph.

I took a picture from my window of the sky to test out a new filter, when i looked at the picture on my Camera i saw a little line, i thought it may have been a little mark or dust on my lens so i took the same picture 2 more times and the object wasn't there on each of the other two photo's so the object could not have been a dust mark. I've also been on today taking pictures and the object has not appeared on any of them either. I've now looked on at the picture on my Laptop and it looks suspicious. If the object can be sharpened using Adobe Photoshop which i do not have, that would be great.