16 Psyche (sye'-kee) is the 13th-largest Main belt asteroid, measuring 250 kilometers in diameter. Annibale de Gasparis (April 9, 1819 – March 21, 1892) was an Italian astronomer. ... Jump to: navigation, search March 17 is the 76th day of the year in the Gregorian Calendar (77th in Leap years). ... Jump to: navigation, search 1852 was a leap year starting on Thursday (see link for 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... Jump to: navigation, search 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... 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 astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... Jump to: navigation, search October 22 is the 295th day of the year (296th in leap years) in the Gregorian Calendar, with 70 days remaining. ... Jump to: navigation, search 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... Jump to: navigation, search The Julian day or Julian day number (JDN) is the number of days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar . ... 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. ... Giga (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ... The metre, or meter (symbol: m) is the SI base unit of length. ... 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. ... 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. ... See also Day (language) A day (symbol: d) is a unit of time. ... A Julian year is the length of an average year in the Julian calendar, 365. ... 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. ... Jump to: navigation, search The second (symbol: s) is the SI base unit of time. ... 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. ... A degree (in full, a degree of arc), usually symbolized °, is a measurement of plane angle, representing 1／360 of a full rotation. ... 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. ... Jump to: navigation, search Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. ... Jump to: navigation, search The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Jump to: navigation, search Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... Jump to: navigation, search It has been suggested that Gravitational constant 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. ... M-type asteroids are metallic asteroids; they are moderately bright (albedo . ... Jump to: navigation, search 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 The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... 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. ... Jump to: navigation, search An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... A kilometre (American spelling: kilometer), symbol: km is a unit of length in the metric system equal to 1000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ...

It was discovered by Annibale de Gasparis on March 17, 1852 from Naples and named after the Greek nymph Psyche. Annibale de Gasparis (April 9, 1819 – March 21, 1892) was an Italian astronomer. ... Jump to: navigation, search March 17 is the 76th day of the year in the Gregorian Calendar (77th in Leap years). ... Jump to: navigation, search 1852 was a leap year starting on Thursday (see link for calendar). ... Jump to: navigation, search Location within Italy Naples (Italian Napoli, Neapolitan Napule, from Greek Νέα Πόλις - Néa Pólis - meaning New City; see also List of traditional Greek place names) is the largest city in southern Italy and capital of Campania Region. ... Jump to: navigation, search Hylas and the Nymphs by John William Waterhouse In Greek mythology, a nymph is any member of a large class of female nature spirits, sometimes bound to a particular location or landform. ... Psyche can refer to: In psychology and related fields, the psyche is the entirety of the non-physical aspects of a person. ...

Spectral and other analyses indicate a fairly pure iron-nickel composition. Psyche and other class M asteroids originate from the metallic core of a large differentiated planetesimal similar to asteroid 4 Vesta. Jump to: navigation, search The electromagnetic spectrum is the range of all possible electromagnetic radiation. ... Jump to: navigation, search General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... General Name, Symbol, Number nickel, Ni, 28 Chemical series transition metals Group, Period, Block 10, 4, d Appearance lustrous, metallic Atomic mass 58. ... M-type asteroids are metallic asteroids; they are moderately bright (albedo . ... Jump to: navigation, search Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms ions (cations) and has metallic bonds, and metals are sometimes described as a lattice of positive ions (cations) in a cloud of electrons. ... In cosmogony, planetary differentiation is a process by which the denser portions of a planet will sink to the center; while less dense materials rise to the surface. ... ÈàÌàìòòIn cosmogony, planetesimals are objects thought to exist within solar nebulae. ... 4 Vesta (ves-ta) is the third-largest asteroid in the Main belt, between 530 and 468 km in diameter. ...

Psyche is massive enough that its perturbations on other asteroids can be measured, which enables accurate mass and density values. Its density turns out to be extremely low, indicating extreme porousity or (less likely) a non-metallic composition. In other words, the asteroid is probably a gigantic rubble pile. (1) Jump to: navigation, search 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. ...

Only one stellar occultation event by Psyche has so far been observed (from Mexico on March 22, 2002). Lightcurve variations indicate a non-spherical body. Jump to: navigation, search The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ... In this July, 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation. ... Jump to: navigation, search March 22 is the 81st day of the year in the Gregorian Calendar (82nd in Leap years). ... Jump to: navigation, search 2002 (MMII) is a common year starting on Tuesday of the Gregorian calendar. ...

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