There's the coma, and then there is the nucleus, which here is too small to see, and you have to remember that in the case of Rosetta, the spacecraft is in that center pixel.
可以看到慧发， 还有慧核，小到几乎看不见， 但是你们要记住在罗塞塔号的案例中， 航天器就在那个中心像素上。