closest approach distance
81Automatic Radar Plotting Aid — A maritime radar with Automatic Radar Plotting Aid (ARPA) capability can create tracks using radar contacts. The system can calculate the tracked object s course, speed and closest point of approach (CPA), thereby knowing if there is a danger of… …
82Nordström's theory of gravitation — In theoretical physics, Nordström s theory of gravitation was a predecessor of general relativity. Strictly speaking, there were actually two distinct theories proposed by the Finnish theoretical physicist Gunnar Nordström, in 1912 and 1913… …
83Neptune — This article is about the planet. For other uses, see Neptune (disambiguation). Neptune   …
84Earth impact hazard — ▪ astronomy Introduction the danger of collision posed by astronomical small bodies whose orbits (orbit) around the Sun carry them near Earth. These objects include the rocky asteroids and their larger fragments and the icy nuclei of comets.… …
85Vega 1 — Infobox Spacecraft Name = Vega 1 spacecraft Caption = Vega 1 Organization = USSR Major Contractors = Mission Type = Flyby, balloon and lander Flyby Of = Venus, Halley Flyby Date = June 11, 1985 (Venus) and March 6, 1986 (Halley) Launch = 1984 12… …
86Eris (dwarf planet) — Eris   Eris (centre) and Dysnomia (left of centre). Hubble Space Telescope …
87Hale-Bopp, Comet — Comet discovered in 1994 by the amateur astronomers Alan Hale and Thomas Bopp at a distance from the Sun of about seven astronomical units, beyond Jupiter s orbit and farther than any comet detected before by amateurs. Astronomers estimated its… …
88Comet — This article is about the astronomical object. For other uses, see Comet (disambiguation). Comet Hale– …
89Galileo (spacecraft) — Infobox Spacecraft Name = Galileo Orbiter Caption = Galileo is prepared for mating with the IUS booster Organization = NASA Major Contractors = Mission Type = Orbiter, fly by Flyby Of = Venus, Earth, 951 Gaspra, 243 Ida Satellite Of = Jupiter… …
9069230 Hermes — Infobox Planet | discovery=yes | physical characteristics = yes | bgcolour=#FFFFC0 name=69230 Hermes discoverer=Karl Wilhelm Reinmuth discovered=October 28, 1937 alt names=1937 UB mp category=Apollo, Mars crosser, Venus crosser epoch=November 26 …
