NED object is 3C 310; Reference is 1969MNRAS.145...31M

   FIG. 12. 3C 310. The large, low brightness region to the North-East of the
 source has a flatter spectrum than the rest of the source. The crosses mark a
 14.5 mag triplet of galaxies, VV 4-36-4/5 (35) in a cluster. The redshift is
 0.0543 (MMS,S).