This is definetly not a comet heres an example of a huge comet called neat that almost hit the sun in 2003 every scientist tought it was the end of the world. But remarkebly the sun made an explosions and deviated the comet. It was twice the size of jupiter and comets leave trails.
Heres the link enjoy:
http://sohowww.nascom.nasa.gov/hotshots/2003_02_12/