Candace: Being the moon was not in the right place, nor any of the planets, my guess is this is a camera issue, or a star ship got it's picture taken. Understand, the size is not relevant, it would depend on where the object is regards the distance to the satellite. These are SDO images and SDO, unlike STEREO A and B, and SOHO, is in earth orbit, about 22,3000 miles out.
Giuseppe, it is impossible for this to be seen on Lasco c3 because of the DISK. The white circle is NOT the sun only as estimate of where the sun is. That the arm is there is of no consequence. Also, as I have reviewed slowed down images, this is two disks, I am pretty sure, and thus I conclude this is a malfunction of equipment. many people feel it could not be the moon, but since I don't do stuff with the moon, I can't make a statement on that. I am surely unhappy with it being used to supposedly prove Nibiru on the net. It does not.
this time a planetary size object was taken in photo betewen Earth and the Sun
Try yourself here: http://www.helioviewer.org/
with this parameter:
In the same time SOHO record this: