HD 190360 d period distribution for three unique MCMC fits with varying RV datasets. The blue histogram is the period determined from the joint astrometric and RV analysis outlined in Section 4 and adopted in this work. Both the red and gray histograms are constructed within the same framework; the red histogram includes only RVs from NEID, whereas the gray histogram includes all RVs except those from NEID. Each case jointly incorporates absolute astrometry from Hipparcos and Gaia. The “No NEID” fit yields two period peaks at 88.8 days and 90.2 days, but we find that the precision and phase coverage from NEID is sufficient for breaking the bimodality.