21062 Yangliwei is an asteroid named for Chinese astronaut Yang Liwei. It was discovered in 1991 and named in 2005. Eric Walter Elst is a Belgian astronomer. ... Jump to: navigation, search June 6 is the 157th day of the year in the Gregorian calendar (158th in leap years), with 208 days remaining. ... Jump to: navigation, search 1991 is a common year starting on Tuesday of the Gregorian calendar. ... The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge... Minor planets, or planetoids are minor bodies of the Solar system orbiting the Sun (or of other planetary systems orbiting other stars) that are larger than meteoroids (the largest of which might be taken to be around 10 meters or so across) but smaller than major planets (Mercury having a... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Jump to: navigation, search The orbital speed of a body, generally a planet, a natural satellite, an artificial satellite, or a multiple star, is the speed at which it orbits around the barycenter of a system, usually around a more massive body. ... Inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit and is the angular distance of the orbital plane from the plane of the reference (usually planets equator or the ecliptic), stated in degrees. ... The Longitude of the ascending node () is one of the orbital elements used to specify the orbit of an object in space. ... The argument of the perihelion is one of the orbital elements describing the orbit of a planet. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2π radians at and only at periapsis. ... Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. ... Jump to: navigation, search Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... Jump to: navigation, search It has been suggested that Law of universal gravitation be merged into this article or section. ... Jump to: navigation, search In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... Asteroids are assigned a type based on spectral shape, color, and sometimes albedo. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standardized distance away. ... The albedo is a measure of reflectivity of a surface or body. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... Jump to: navigation, search U.S. Space Shuttle astronaut Bruce McCandless II using a manned maneuvering unit (MMU) outside the Challenger in 1984. ... Jump to: navigation, search Dr. Yáng LìwÄ›i (Simplified Chinese: 杨利伟; Traditional Chinese: 楊利偉) (born June 21, 1965) is an astronaut (hangtianyuan) or Taikonaut (or yuhangyuans) and the Peoples Republic of Chinas first man in space. ... Jump to: navigation, search 1991 is a common year starting on Tuesday of the Gregorian calendar. ... Jump to: navigation, search 2005(MMV) is a common year starting on Saturday of the Gregorian calendar. ...

References

• AstDys object list
• “Asteroids Named After First Manned Spacecraft, Spaceman”, Xinhua News Agency, March 17, 2005.