During some spacecraft fly-bys at Earth it was noted that their final speed didn’t match the expected values. The difference was too small to be relevant for their missions, but too large to be explained by simple measurement uncertainties. It is either a poorly understood or forgotten part of known physics or some new physics. Juno is in a highly elliptic orbit around Jupiter. If the effect is real, we expect it to see an even stronger effect there thanks to Jupiter’s huge mass and potentially its fast rotation. And ... it seems that we do. Here is a report Whatever it is, it seems to be stronger at Jupiter.