452 Hamiltonia is an asteroid. It was discovered by James Edward Keeler on December 6, 1899, but was lost until 1987 after that. Its provisional name was 1899 FD. In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... The astronomical unit (AU or au or a. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The astronomical unit (AU or au or a. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The astronomical unit (AU or au or a. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... Water, Rabbit, and Deer: three of the 20 day symbols in the Aztec calendar, from the Aztec Sun Stone. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... James Edward Keeler (September 10, 1857 â August 12, 1900) was an American astronomer. ... 1899 (MDCCCXCIX) was a common year starting on Sunday (see link for calendar). ... 253 Mathilde, a C-type asteroid. ... James Edward Keeler (September 10, 1857 â August 12, 1900) was an American astronomer. ... December 6 is the 340th day (341st on leap years) of the year in the Gregorian calendar. ... 1899 (MDCCCXCIX) was a common year starting on Sunday (see link for calendar). ... 1987 (MCMLXXXVII) was a common year starting on Thursday of the Gregorian calendar. ...