When you click on the NED link, one consistently gets a lost precision error. This appears to be because a full double’s worth of precision may be betting passed. If we assume 0.01" precision (which is more than we need for matching), I think we need to have the string pass include {0:.6} .format(RA) and {0:.6} .format(Dec) or something similar.
I've found that sources with positive declination coordinate need to have a "+" in between the RA and DEC for links to NED or it won't find the object.
Reported by @radioastronomer via Slack: