1I/Mean motion

interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope

When the short-term periodic oscillations of this motion are averaged out, they are considered "mean" as opposed to "true" values. Thus, the vernal equinox

"The fate of planetesimal discs in young open clusters: implications for 1I/'Oumuamua, the Kuiper belt, the Oort cloud and more". Monthly Notices of the

2 i ⟩ ) | e i ⟩ ⟨ e i | , {\displaystyle \sum _{i}{\big (}\langle f_{1i}|f_{1i}\rangle +\langle f_{2i}|f_{2i}\rangle {\big )}|e_{i}\rangle \langle e_{i}|

Planets. 7 (1). Terrapub: 1-113. arXiv:1911.03984. Bibcode:2019MEEP....7....1I. doi:10.6084/m9.figshare.19620609. Valtonen, M. J. (2005). The Three-Body