For information on field definitions see Guide to Hipparcos Double & Multiple Systems Annex fields (pdf)
Field Value Field Description DX1 : 27989 Hipparcos Catalogue (HIP) identifier DX2 : 3.36 Cosmic error, epsilon (mas) DX3 : 0.62 Standard error of epsilon, sigma_epsilon (mas) DX4 : P Flag indicating a note at the end of relevant volume HGNOTES HDNOTES HPNOTES PN1 |2|3|N4|N5|PN6 27989| | | 1| 1|Variations on time scale of 400d.