Arp 58 is also cataloged as UGC 4457. It is in
the class Spirals with Small HSB Companions on Arms. In this case, the
companions are extraordinarily high surface brightness. The southern arm,
which sweeps off to the east, appears to have two field stars lying on it.
However, they are not field stars but very bright, compact galaxies. This
is almost impossible to detect with the small scale of my image but is obvious
on the Atlas image. It is consistent with the Atlas note, which says
"comp. on end of broken arm nearly star-like".
|10-inch Newtonian, StarlightXpress MX716, 52 minutes|