Looking at the latest diagrams, seems like Holmes is on the opposite side of the Sun from NH--probably not directly, but still too close to chance. I'm also guessing that the team considers it a low-priority target, since they'd have to bring the craft out of hibernation to view it; with the other risks involved, it probably isn't worth it to them.
Good question, though. Ironic, too--as I realize that even if NH could view the comet, the view would still be head-on, as it is for us.
